[HN Gopher] Show HN: I made a web-based notepad with a built in ...
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Show HN: I made a web-based notepad with a built in unit calculator
Hi HN It also supports percentages, dates and variables. I've
been working on this alone for a few years now, so would love to
get some feedback.
Author : tonyonodi
Score : 425 points
Date : 2022-08-17 09:01 UTC (13 hours ago)
(HTM) web link (numpad.io)
(TXT) w3m dump (numpad.io)
| harpiaharpyja wrote:
| Very cool! Any plans to support vector/matrix operations? I
| occasionally do some work with 2D/3D graphics or physics and
| having some basic linalg would be nice.
|
| I can see myself using this a lot as a scratch pad to hash out
| ideas while implementing stuff. The ability to define custom
| functions would be very helpful for that.
| tonyonodi wrote:
| It's something I've thought about but I'm not sure I'm going to
| implement it for a while as it would be quite a big
| undertaking. The same is true of complex numbers unfortunately.
| botinko wrote:
| 2+2 -> 4 ok 2+2 _2 - > 6 ok 2+2_2-3 -> 0 What?
| suntuba wrote:
| Yes - there is a precedence problem. Try 2*2-3 (2 times 2 minus
| 3).
| samwillis wrote:
| I like how you are using a Gist for the exchange rates (https://g
| ist.github.com/tonyonodi/e154f529180b1f0f475966d333...), do you
| have a GitHub action setup to automatically update that?
| tonyonodi wrote:
| Impressed you found that. I don't have anything set up to
| automatically update it currently, but I do have an _intention_
| to have something set up to automatically update it.
| ewidar wrote:
| Btw the conversions don't seem to work for me:
|
| > 100 eur to usd $-100.63 > 100 usd to eur Incompatible units
| mkishi wrote:
| The right operator for unit conversions is "in." "to" is
| used for ranges, so it's doing 100 euros _goes to_ 1 us
| dollar and giving you back the answer in dollars.
|
| But it seems the parser is breaking when trying to do the
| inverse, anyway: "100 usd in eur" seems to do "e*ur" and
| gives "Values must be converted to units."
| samwillis wrote:
| Ha, yes, I was being nosy. It was quite easy to spot as it's
| the only XHR/Fetch request.
|
| I was intrigued what you had used to build it, and if you had
| built your own solver (which you have), and what editor you
| used (Code Mirror) so went looking at the code. Interesting
| to see you left the source maps for production, made it easy
| for my sleuthing...
|
| I experimented with a similar idea last year, but used
| ProseMirror/TipTap as the editor to enable rich text editing,
| and the MathJS (https://mathjs.org) solver. I also combined
| it with PouchDB and Yjs for offline editing and syncing
| between devices. Never finished it though, you have kept your
| nice and simple!
| tonyonodi wrote:
| Oops, didn't realise I'd left source maps in, thanks for
| pointing it out!
|
| Your project sounds really interesting, I'm following you
| on twitter now, so tweet about it if you ever finish it and
| hopefully I'll see.
|
| Having CRDT-based syncing/collaboration is a direction I'd
| like to take NumPad in eventually, and if I have time. But
| I definitely think that ignoring that part completely has
| allowed me to get it to an MVP state.
| tonfreed wrote:
| Very cool idea, would love to see it work with recipes if you
| could manage it. I always have to look it up when I see a cup of
| butter listed in the ingredients of a cake
| OJFord wrote:
| This is great, I use `bc` a lot at work (particularly when away
| from desk and my actual calculator) but I'll probably bookmark
| this to use instead.
|
| One bit of very minor feedback:
|
| `x^y tonnes` errors 'exponent must be unitless'. The more
| expected (IMO) grouping `(x^y) tonnes` works, so why not have the
| non-error grouping be the implied one, when no parens given?
| tonyonodi wrote:
| I hadn't thought about that before but I think you're right,
| I've added it to my roadmap.
|
| Getting operator precedence right has been pretty fraught tbh.
| For example "1km / 3 hours" is evaluated as "(1km) / (3
| hours)", but "1 / 3 hours" is evaluated as "(1 / 3) hours",
| which is odd from a PL perspective, but I think it's more
| intuitive from a user perspective for this sort of thing.
| mixcocam wrote:
| I wonder when Google docs will introduce this type of feature.
| radiojasper wrote:
| ... and then cancel it 2 years after?
| mjaniczek wrote:
| Very nice! Bookmarked.
|
| I found a small bug: `5 hours 20 minutes` will give you `5 hr 19
| min 60 s`. This only happens with some numbers in the minutes
| slot.
| infinityio wrote:
| on a similar note - QALC in vscode offers a similar experience
| for file types of your choosing
| flanbiscuit wrote:
| Looks good! I love the idea of the embedded calculator
|
| I noticed that it doesn't handle remainder/modulo (%) equations:
|
| "10 % 2" results in: "Left hand side of addition cannot be a
| percentage."
|
| It does look like decimal.js can handle that:
| https://mikemcl.github.io/decimal.js/#mod
|
| https://developer.mozilla.org/en-US/docs/Web/JavaScript/Refe...
| ianbicking wrote:
| You can do "6% of $10" and get "$0.6" (minor note that it would
| look better as $0.60).
|
| Looks like there's a mod operator, so "2303 mod 10" gives 3.
| mcintyre1994 wrote:
| It does, but you have to type `10 mod 2`
| jjt-yn_t wrote:
| tiagod wrote:
| Hey, great tool!
|
| Just a little bug: I found that if I click a number to copy, then
| click it again, I'll get the original string in my clipboard
| concatenated with " Copied!"
| tonyonodi wrote:
| Glad you like it! Thank you for the bug report, I'll get it
| fixed shortly
| layer8 wrote:
| This is really neat, but you need to rethink the
| date/time/duration arithmetics. You're equating 12 months with
| 365.25 days, which gives rise to results like "1 month - 31 days"
| giving "-0.0184804928 months". At the same time, "30th January +
| 1 month" gives "28 Feb 2022 at 12:00:00" (why "2022", and why "at
| 12:00:00"? -- this is only a date calculation without reference
| to a year or to a time of day), while "30th January + 30 days"
| gives "1 Mar 2022 at 12:00:00", although "1 month in days" gives
| "30.4375 days".
|
| In reality, months/years are simply not convertible to days/weeks
| arithmetically, and you can't sensibly add months to certain
| dates, and sometimes also not years (for February 29th). The
| former should give "Incompatible units", and the latter should
| result in something like "Undefined" for incompatible dates.
| suntuba wrote:
| Nice app - I like the workspace sharing feature.
|
| It would be nice if "1 mm / inch" would be returned as a unitless
| number. I know that you can enter "1 mm in inch" but there are
| cases where it would help to have the calculator reduce the units
| for you.
| tesseract wrote:
| For what it's worth, `1 mm/inch in 1` seems to work as
| expected.
| akino_germany wrote:
| TIL that it is convention in the English language to place the
| euro sign in front of the amount and not after it, like in most
| other European languages.
| skrebbel wrote:
| TIL: Germans put it after the amount :-)
|
| (I'm European too and I thought it was always in front,
| everywhere)
| LoveMortuus wrote:
| Slovenian here, we put it after. It makes more sense, at
| least to me, since you do say that apple costs five euros,
| where as the other way around: That apple costs euro five.
| Which would here mean that it costs 1.05EUR and not 5EUR.
| tonyonodi wrote:
| Yeah, I'm British and I'll concede that how we write it doesn't
| make sense. I do intend to localise it/add options in the
| future.
|
| NumPad currently accepts numbers in the "9,999.9" format, which
| is the default in the anglosphere, but "9.999,9" is common
| elsewhere. So that's another thing I'd like to address in the
| future.
| kretaceous wrote:
| There are a few bugs as people have mentioned but the currency
| support is a huge win for me. Thanks for making this!
| majkinetor wrote:
| There is a bug with unintendend addition if word starts with the
| variable name e2foo 4.7182818285 pi-
| hole 3.1415926536
| pwdisswordfish0 wrote:
| The docs say that this is using CodeMirror. The CodeMirror
| license says that you're allowed to use CodeMirror for your
| stuff, but that stuff has to in turn include:
|
| 1. the copyright notice
|
| 2. the text itself that explains that you/others have this
| permission/obligation
|
| Currently, it looks like NumPad isn't doing either.
|
| From comments here, NumPad is evidently also using decimal.js,
| which has similar terms.
| ianbicking wrote:
| The About page is also a reasonable place to put credits
| (whether required or not)
| tonyonodi wrote:
| Both are MIT licensed, I don't think this is the case.
| samatman wrote:
| It's true of source code but not artifacts. MIT places no
| obligation to distribute source, but requires credit and
| license when someone does so.
| pwdisswordfish0 wrote:
| > It's true of source code but not artifacts.
|
| That's simply not true. Please don't do stuff like this--to
| go off and make these kind of proclamations in public. It's
| negligent at best.
| afro88 wrote:
| Just when I thought I understood the MIT license, I'm
| back to confused. Can you link me to where this is
| clearly outlined? Do you need to attribute somewhere in
| artifacts or not?
| tonyonodi wrote:
| Thanks for clearing that up, I'm not distributing the
| source code so I think I'm good.
| pwdisswordfish0 wrote:
| Don't look to people who don't know what they're talking
| about to "clear things up" for you. If you think they
| have any qualms about leaving you to deal with the
| blowback after misleading you with uninformed takes (and
| pointing the finger at you for putting your faith in them
| to begin with), then you're setting yourself up to be
| burned.
|
| There's a reason why everyone who has their ducks in a
| row (in other words, people with competent legal counsel
| along with something to lose, e.g. Mozilla, Google,
| Apple, Microsoft, etc) will bake something like
| about:license into the stuff they work on, even if it's
| buried in some "open source licenses" entry of an About
| screen reachable by the last menu item in the system
| settings. Spoiler alert: _it 's because they have to_--in
| order to comply with the terms of the license. It's not
| because they just think it's the nice thing to do. (And
| definitely not because it's fun and easy to do, because
| it's not.)
| 0xRusty wrote:
| It's very nicely done, but I'm afraid I don't "get it" with
| things like this and written out calculators in general. Why
| would I type out something long like:
|
| " Alice's food = PS30 Bob's food = PS25 VAT = 20% Alice's food +
| Bob's food + VAT "
|
| Rather than just punch (30+25)*1.2 straight into a calculator?
| wccrawford wrote:
| Maybe you want to store all that information for later and also
| want the calculation, both now and later?
| 0xRusty wrote:
| So...a spreadsheet?
| samwhiteUK wrote:
| A spreadsheet won't automatically work out and display
| units for you
| samatman wrote:
| I've found that the Calca[+] format hits a nice sweet spot
| between using an ordinary calculator and running a spreadsheet.
|
| [+]: http://calca.io
|
| It's particularly suited to calculations I'm doing by fetching
| various numbers from websites, and for the most part it
| 'composes' by just copypasting a calca into another one.
|
| Basically where the numbers mean something, aren't stable / I
| don't know them all when I start, but there's no tabular data
| or significant aggregation going into the question.
| adamddev1 wrote:
| I like this! One thing that would be nice is a time zone
| converter. For example:
|
| 8:00pm 24 Aug Toronto time in Dubai time
|
| And have the conversion show up.
| tonyonodi wrote:
| It's on the list ;) https://numpad.io/about/
| ghjm wrote:
| Maybe there's already a way to do this, but it seems to me that
| it would be useful to be able to refer to the answer on a
| previous line, like the Ans key on a TI calculator. So:
|
| 2 + 3 (=4)
|
| Ans * 2 (=8)
| softawre wrote:
| x = 2 + 3
|
| x * 2
| ajsnigrutin wrote:
| Fun idea, but:
|
| 10^900=[?] :)
| tonyonodi wrote:
| I think that's right, isn't it?
| euos wrote:
| Looks so cool and clean. Stealing the design for my project
| bww wrote:
| This looks pretty cool. I've long been looking for something
| similar to Soulver (https://soulver.app/) that I can use on
| Linux. This seems promising.
|
| One small criticism: In my opinion, no web-based writing app is
| useful unless the tab key inserts a tab. The default behavior of
| most browsers to move focus to the next field is tremendously
| infuriating in this context. Unfortunately, that's what happens
| here, at least for Firefox.
|
| (Related: key combinations that normally perform cursor movements
| but which are often used by browser for navigation.)
| mk12 wrote:
| I've never used Soulver, but there is a free web app
| https://numbr.dev that seems very similar to it.
| tonyonodi wrote:
| Yeah, honestly this has been annoying me too, I just haven't
| got around to fixing it. It's using CodeMirror 6 as the editor,
| the author said he deliberately made this version not "break"
| the default tab behaviour, which I think is understandable as a
| library author, but that makes it my job to fix!
| math-dev wrote:
| I thought CM had some example code on how to override the tab
| behaviour. Might be worth checking out as I agree it sucks to
| not have tab = indent 4 spaces
| chrisweekly wrote:
| 2 spaces!
|
| (ducks) (but srsly)
| dugmartin wrote:
| To save you some time, here is what I did to add tabs to CM 6
| (I think I found it somewhere or I may have cobbled it
| together to insert two spaces):
|
| First import things you need: import {
| indentMore, indentLess } from "@codemirror/commands"
|
| Then create a command: export const
| insertTab: StateCommand = ({state, dispatch}) => {
| if (state.selection.ranges.some(r => !r.empty)) return
| indentMore({state, dispatch})
| dispatch(state.update(state.replaceSelection(" "),
| {scrollIntoView: true, userEvent: "input"})) return
| true }
|
| and then add it to the keymap in your extensions array:
| const extensions: Extension[] = [ ...other
| extensions here..., keymap.of([
| ...closeBracketsKeymap, ...defaultKeymap,
| ...searchKeymap, ...historyKeymap,
| ...completionKeymap, {key: "Tab", run:
| insertTab, shift: indentLess} ]), ]
|
| and then pass the extensions array into where you setup your
| editor view, eg: const view = new
| EditorView({ state: EditorState.create({
| doc: textarea.value, extensions }),
| parent: editor })
| madrox wrote:
| While I tend to agree, this can break accessibility. The
| official WAI-ARIA authoring practices recommend Control+M.
| https://www.w3.org/WAI/ARIA/apg/
|
| There should likely be an explicit override of accessibility so
| the visitor knows what they're getting into.
| usrme wrote:
| Might not be as comprehensive as Soulver, but here's something
| I've been using in a browser to fiddle with:
| https://cruncher.io/.
| tonyonodi wrote:
| Gosh, everyone has made one of these haven't they?
| jen729w wrote:
| Not everyone! About five people from a population of six
| billion. And you're one of them.
|
| Yours looks great. Well done on the release.
|
| Line 100 might have an error though? It isn't recognising
| `30th Sept`, does it not like the final `t`?
| makach wrote:
| I have as well :-) but I lose for not having released. This
| version is pretty cool though, will probably not gonna use
| it because same reason I didn't evolve my version. Don't
| need it, and when I need it I don't need for it to be
| dynamic.
| Groxx wrote:
| > Cruncher can also automatically plot changes as you adjust
| a variable
|
| Well that's pretty neat. I've seen it in fancier setups, but
| not something Soulver-like. It seems a lot more usable here,
| since practically any equation can show it.
| sabellito wrote:
| I've made this one and use it daily:
|
| https://github.com/filipesabella/calcpad
|
| It's electron though, if that's important to you.
| anthropodie wrote:
| Hey this is pretty cool. Instead of Electron app I would
| prefer it as a browser tab. Wish it could be self hosted.
| sabellito wrote:
| Thanks!
|
| You can use the web version, it's all offline and saved in
| localStorage. Works well in mobile too and can be
| "installed" as an app from there.
|
| https://filipesabella.com/CalcPad
| grimgrin wrote:
| I wanted to see how this would run in redbean[1], and it
| runs fantastically!
|
| If you wanna see this in a little executable that you can
| pass around to your friends, check out this repo I threw
| up: https://github.com/shmup/redbean-calcpad
|
| This is now essentially an offline CalcPad that still
| leverages LocalStorage, since the UI is your browser.
| I've configured this specific build to automatically
| launch your default browser when you run it.
|
| 1. https://justine.lol/redbean2/
| sigmaprimus wrote:
| Good Feedback! I would think a checkbox that enables tab
| function would be best, how would you feel about a FF Plugin
| that achieves this? My only concern would be that FF has
| reserved that particular key and it would require special
| permissions to map it to your needs.
| addandsubtract wrote:
| I think it should just be a toggle on the page: "Hijack
| keyboard shortcuts? Y/N". Figma, Miro, Google and co do it
| without asking. It's something we've come to expect with web
| apps, so a toggle would be a fair middle ground.
| cpow3104 wrote:
| I came here to deposit this exact same comment with one
| addition. Great project but seems to be lacking base support.
| As an engineer I need hex at least.
| justinlloyd wrote:
| SoulVer on macOS as you know. OpalCalc on Windows. Speedcrunch
| on all three platforms, though I will categorically state that
| whilst Speedcrunch is very good, it is no Soulver/OpalCalc.
| spectaclepiece wrote:
| This is an excellent tool, would be good to have some simple
| rounding functionality. Perhaps a generic visible decimal points
| settings or a round() method of some sort.
| reaktivo wrote:
| One thing that I haven't found supported in other calculators is
| returning the min or max between two values
| supernes wrote:
| "Right hand side of subtraction cannot be a date or time." :(
| Severian wrote:
| Can you add bit and byte values, as well as units per unit of
| time please?
|
| Base 10 (GB for example) and base 2 (GiB) would be very handy.
| Full words as an alias as well, so GB -> gigabyte, and GiB ->
| gibibyte.
|
| That way you can do something like:
|
| 1GB / 40MB/s in minutes
|
| 1GB to Gib
|
| 1GB to bits
|
| 50 bits to bytes
| tonyonodi wrote:
| Yes I can, I'm busy with launch stuff today but I'll get that
| done soon
| xixixao wrote:
| I also made one of these, still working on it now with a focus on
| including support for accuracy/measurement errors.
|
| This is impressively close to what I have in my desired spec (but
| already more future proof). Congratz!
|
| https://github.com/xixixao/recomputer
|
| https://xixixao.github.io/recomputer/
| tonyonodi wrote:
| Nice work! I like that you're using rational numbers, I thought
| about going that route but decided to compromise by using
| Decmial.js in the end. Also really like the "Same Use Case"
| section in your readme. It's a good summary of the reasons I
| made this app :)
| majkinetor wrote:
| On srelated note, I use Markdown Excel:
|
| * https://github.com/cescript/MarkdownFormula
|
| Its totally awesome, although it needs some more work.
| xaduha wrote:
| I'm surprised no one mentioned https://insect.sh yet.
| badcppdev wrote:
| Mini feedback: The difference between a defined variable and an
| undefined variable could be clearer. And should an expression
| with an undefined variable still give a value?
|
| So if you had: Alice's food + Bob's foood = PS30 then I think
| there should be more to highlight the typo.
|
| P.S. This is an awesome thing
| badcppdev wrote:
| Ooh a super useful function (in my experience) is the monthly
| mortgage repayment calculator.
|
| MonthlyRepayment(principle, annual_interest, term_in_years)
| owl110 wrote:
| Looks very interesting. I think there is some ambiguity with
| respect to currency symbols, $ converts to USD and PS to GBP.
| However, depending on user location those symbols can be used to
| mean very different currencies.
| tonyonodi wrote:
| Is there anywhere else that uses "PS"? I didn't feel great
| about having $ default to USD but it is probably what most
| users want. I'll probably make it location-aware and/or allow
| the user to decide which it defaults to in the future.
| owl110 wrote:
| I believe pound sign is used in a few other places as well
| (see https://en.wikipedia.org/wiki/Pound_sign). Enforcing the
| use of ISO 4217 codes
| (https://en.wikipedia.org/wiki/ISO_4217) may be a solution to
| avoid this type of ambiguities.
| doerig wrote:
| Very nice! Reminds me a lot of numi (https://numi.app). Similar,
| but MacOS only (and paid).
| athenot wrote:
| Big fan of numi, somehow I like it better as a smaller window
| tucked on the corner of my screen than a full browser page.
| staz wrote:
| I find it pretty cool.
|
| Some feedback: I tried to convert m/s in km/h and it wouldn't
| works, finally found how to do it, you need to specify `hour` in
| full letters
|
| I assumed it was something like an etherpad that you could edit
| collaboratively but apparently not
| tonyonodi wrote:
| "kph" is also supported, will add support for "km/h"
| joshspankit wrote:
| And `mpg`/`l/100k` please!
| tonyonodi wrote:
| I've avoided adding mpg because the UK and US disagree on
| what a gallon is and mpUKg/mpUSg is not very nice to look
| at. You can write "miles per gallon" or "miles per US
| gallon" because per is the same as the "/" operator, and
| you can _sort of_ do "L/100km" but you can't convert to
| it.
|
| I'll have to think some more about this one.
| joshspankit wrote:
| I think I see where you're going. I'd be comfortable with
| "litres per hundred kilometres" if that's possible and
| especially if there was a "did you mean" suggestion
| prompt
| JacobSeated wrote:
| I would love to have a plain text "notepad" for iOS, because the
| built in app is horrendous and converts links to clickable
| hyperlinks. Etc. Hate that piss shit.
| anthropodie wrote:
| Can I self host this?
| jdoss wrote:
| I second this question. I would love to selfhost this too. I
| hope the creator considers opensourcing their work.
| mkrishnan wrote:
| Love it. Thank you! Thank you! Thank you!.
| defrost wrote:
| Nice - I'll give it props for:
|
| > 1 metre + 8 chain = 161.9344 m
|
| > 1 tonne + 1 short ton = 1.90718474 t
|
| > 1 tonne + 1 long ton = 2.0160469 t
|
| and give it a pass for not supporting pre 1963 UK | US historic
| weights and measures .. that's getting into a pretty specific use
| case where Standards nerds like to have a clear display of what
| conversion factors are in play and what provenance those factors
| have.
|
| Time Zone support (on your About ToDo) will be interesting,
| historic computations with daytime savings support will be a
| quagmnire :-)
|
| The SHARE DOC URLs seem a bit long - something like "base64 full
| text of doc as an URL" I guess.
|
| Will this hit a URL length limit if widespread use becomes a
| thing?
|
| jq play : https://jqplay.org/s/f1r-BZ5xYd2
|
| regex101 : https://regex101.com/r/OqojJl/1
|
| do server side storage and doc hash .. which has issues of its
| own.
| tonyonodi wrote:
| You're right, I'm using lz-string to compress the text before
| shoving it in the URL. This is definitely a necessary evil for
| the time being so I don't need a back end component to the app.
| But eventually I do want prettier URLs and collaborative
| editing if I can make that work without it bankrupting me or
| driving me insane.
| joshspankit wrote:
| simonz05 wrote:
| Be aware URL field in browsers have a maximum number of
| characters they accept.
| dunham wrote:
| For what it's worth, the typescript playground takes the
| exact same approach as you, placing a compressed (lz-string)
| copy of the text after the #code/ in a sharing url.
| tonyonodi wrote:
| Well, I love this comment. And yes, time zone support terrifies
| me an order of magnitude more than anything else on the list.
| defrost wrote:
| On the gnarly scale dealing with with pre-WGS84 paper maps
| from about the globe is arguably worse ..
|
| there are so many reference ellipsoids and datums used in
| different parts of the world at different times .. and then
| there are the many variations on curved surface to flat map
| projections to deal with.
|
| But yes - Time and date is an iceberg domain :-)
| XorNot wrote:
| Didn't tell me how much 8 gills[1] would be in liters (about 1)
|
| [1] https://en.wikipedia.org/wiki/Gill_(unit)
| tonyonodi wrote:
| I am truly sorry
| hcrisp wrote:
| I was disappointed it couldn't convert "1 furlong / 1
| fortnight in mph", but this was successful:
|
| > 14 furlongs / 2 weeks in mph [0.0052083333 mph]
| tonyonodi wrote:
| That's a very enjoyable calculation!
| T3RMINATED wrote:
| dubcanada wrote:
| Small bug report
|
| 23 USD to CAD = -28.875332087 CAD
|
| $23 USD to CAD = -30.174259569 CAD
|
| It does not appear to like the USD/CAD stuff
| amelius wrote:
| For the next step, maybe you can build an editor/autocomplete
| with a search-engine in it (you can use an existing search
| engine).
| GauntletWizard wrote:
| I would really appreciate if there were units for si prefixes,
| common orders of magnitude, and compute, i.e. "G", "M", "billion"
| "million", "megabytes" and "gigabytes"
| jackphilson wrote:
| how expensive was that domain name lol
| tonyonodi wrote:
| I'm just paying the standard fee for a .io, it's a far less
| polluted namespace than .com :)
| alexcosan wrote:
| Nice work on getting this out. I think it looks pretty neat and
| simple to use.
|
| I've had some issues when using it though: - on mobile, moving
| the cursor in a calculation doesn't work very well; - More
| important, multiplying "200 * 10%" results in "2000%", I believe
| the result should be "20";
| https://www.wolframalpha.com/input?i=200+*+10%25
| joshspankit wrote:
| I also had issues navigating on mobile (iPad). There seem to be
| hover states that get in the way (example: I tapped on a line
| to move to that line and it had a small popup to say something
| was copied)
| np_tedious wrote:
| Those are equal values right? This is just formatting
| preference.
|
| I agree formatting should probably go with the first factor,
| but I wouldn't say current behavior is incorrect
| spiffytech wrote:
| Very cool!
|
| This reminds me of the open source NoteCalc:
| https://bbodi.github.io/notecalc3/
|
| It was discussed on HN, you might look there for inspiration:
| https://news.ycombinator.com/item?id=25495393
| bbodi wrote:
| I am the author of NoteCalc, and it warms my heart that my
| project is mentioned here :)
|
| As a sidenote I would like to mention that NoteCalc is still in
| active (but slow) development, though I do it privately, and
| the next big release will be definitely this year.
| mad2021 wrote:
| Just discovered NoteCalc, really cool. Thanks!
| tonyonodi wrote:
| I hadn't seen that before, it's very impressive!
| zwog wrote:
| When I type `4W*3hours` the result is `12 mWh`. Same with
| `12Wh/3hours = 4kW`
| tonyonodi wrote:
| Oh, thank you for the bug report. I'm not sure why that's
| happening, but will look into it shortly.
| dskloet wrote:
| On my Android phone I can't see the last letter of some lines and
| I'm unable to zoom out.
| tonyonodi wrote:
| I'm sorry about that, I don't have an Android device to test
| on. But I'll fix that when I get hold of one.
| dskloet wrote:
| I also notice when typing a number it gets entered twice. So
| I'll type a 3 and get 33.
| sandgiant wrote:
| This is great! Love Soulver too, but having it in the browser is
| fantastic. Well done!
| tonyonodi wrote:
| I'm a big fan of Soulver too! It's the OG in this app category
| and I still use it for calculations NumPad can't do (yet!).
| stephc_int13 wrote:
| I really like it, except the fact that it is not an app but
| something on the web.
|
| I wish it could be something lightweight and launched as a native
| app.
| bkazez wrote:
| Very cool! Some ideas:
|
| 1. Doesn't seem to support area conversions (tried 400 square
| meters, 400 m^2, and abbreviations in between).
|
| 2. If I only give a time, it would be more useful if it gave a
| time-only result rather than defaulting to the current date -
| unless it rolls over to a different date. (E.g. in Soulver,
| "2:30pm + 20hr" gives "Tomorrow at 10:30".)
|
| 3. It would be nice to support multiple abbreviations for minutes
| (mn/min are both used in various countries).
| tonyonodi wrote:
| Thanks for the feedback
|
| 1. "square" before a unit I probably will implement that in the
| future. I'm not sure why "400 m^2" isn't working for you, I've
| just tried it and it works as expected for me?
|
| 2. It's a little bit clunky, but I decided to always specify
| the time and date being shown because there's so much potential
| for ambiguity. I might revisit this if I can think of a better
| way of doing it that's still unambiguous (the Soulver way isn't
| bad tbh)
|
| 3. "min" is supported, I've never come across "mn", do you know
| where it's used?
| zweifuss wrote:
| 400 inch^2 -> 400 inches2 10 km^2 -> 10 km2
|
| ... works for me.
| bkazez wrote:
| Ohhh, I missed that "->" was the operator. I was typing "to"
| as in Google searches.
|
| Re dateless times, yes, I think the Soulver way is
| unambiguous but still human-friendly.
| huhtenberg wrote:
| Math is not terribly precise I'm afraid :) >
| 1111111111111111111111111111111*9 >
| 10,000,000,000,000,000,000,000,000,000,000
| joshspankit wrote:
| That doesn't _seem_ like a floating point inaccuracy. What's
| going on there?
| tonyonodi wrote:
| NumPad uses Decimal.js to represent numbers
|
| https://mikemcl.github.io/decimal.js/
| bflesch wrote:
| Found an error: 20mm * 30mm * 7mm in m^3 ->
| incompatible units
| seper8 wrote:
| Love it! This kind of stuff should be added to notepad on Windows
| (in an opt-in manner)!
| imagine99 wrote:
| IIRC, calc.exe (Windows Calculator) has some (limited) unit
| conversions built in. Better than nothing in an offline
| environment...
| menthena wrote:
| how do you do
|
| great work, bookmarked.
|
| "Share doc" is not clear imo. Why not "Save & Share"?
| dabedee wrote:
| Looks awesome! Well done! It would be great to have a similar UI
| for LaTeX or maybe even a REPL. Cheers!
| argulane wrote:
| https://www.overleaf.com/ comes quite close
| ivolimmen wrote:
| This looks really useful for a quick calculation. Thanks for the
| bookmark!
| lazylion2 wrote:
| "Share Doc" doesn't work if you edit a shared doc
| vhanda wrote:
| This is awesome.
|
| Minor bug report -
|
| * 5 feet 8 inches to centimeters -> -171.72 cm
|
| * 5 feet 8 inches to meters -> -0.7272 m
|
| * 5 feet 8 inches to cms -> doesn't work
|
| The conversion seems wrong in the case of cms, and I'm not sure
| why it's always negative.
| Spare_account wrote:
| After reading the sibling comments to mine, I've worked out
| what it is doing.
|
| > _* 5 feet 8 inches to centimeters - > -171.72 cm_
|
| As @defrost said, the 'to' operator instructs NumPad to
| calculate the distance from the unit before 'to' and the unit
| after 'to'.
|
| To the nearest mm, 5 feet 8 inches = 172.72cm
|
| It appears that NumPad is defaulting to a value of '1' where no
| value is specified, so it is calcuating the distance BACK from
| '5 feet 8 inches' TO '1 centimeters'.
|
| It correctly responds with -171.72, which is 1cm less than
| 172.72.
|
| > _* 5 feet 8 inches to meters - > -0.7272 m _
|
| Same as above, except the calucation is the distance back from
| '5 feet 8 inches' TO '1 metres'.*
|
| If you use the operator 'in', NumPad calculates the answer
| correctly:
|
| 5 feet 8 inches in metres -> 1.7272 m
| defrost wrote:
| "to" is a subtraction operation, not a convert to cue.
|
| As in (distance from) 30 to 50 (is 20 == 50 - 30 )
| radiojasper wrote:
| "cms" is nothing, try "cm". Also you're 100% correct that this
| shouldn't be a negative number. Screenie [0]
|
| [0] https://jasper.monster/sharex/firefox_eXIffwiyBq.png
|
| //EDIT
|
| Ah yeah, replace "to" with "in" and you're good! [1]
|
| [1] https://jasper.monster/sharex/firefox_rVKx2w1TUI.png
| seligman99 wrote:
| Along the same lines, I made a command line calculator that does
| basic unit conversions, and has a few other tricks up it's sleeve
|
| https://github.com/seligman/human_calc
|
| I find it surprisingly useful. It's probably one of those things
| that has an audience of one, but I find it useful.
| tonyonodi wrote:
| This is really cool, you're a braver person than I for tackling
| the English representation of numbers stuff!
| swah wrote:
| Congrats! I'd say it makes no sense to post here before doing
| hex,bin,dec conversion and bitwise operations ;)
| AbraKdabra wrote:
| I tried converting USD to ARS and it didn't work, I guess you
| should make a list of how units are named so I can use the
| correct one.
| shash wrote:
| Interesting! Thank you...
|
| I was trying to divide an area by a smaller area to get the
| number of widgets, and it insists on making that into a
| percentage. Is there a way to make it report a raw number instead
| of percentages when the two quantities are the same unit?
| tonyonodi wrote:
| What's the exact calculation you're doing?
| shreyshnaccount wrote:
| THIS IS AMAZING. the next step is adding variables and
| assignments and conditionals, and you have something very
| powerful that can be used by just about anybody to do really
| interesting things. provided you have a way to integrate with
| other services that a lot of people use
| janjones wrote:
| Variables and assignments are already supported.
| shreyshnaccount wrote:
| should rephrase, meant to say (variables, assignments) AND
| conditionals
| tonyonodi wrote:
| Thanks! Turning the current language into a Turing complete one
| would be a huge step up in complexity and I'm not sure it will
| ever make sense to implement. But I have thought about adding
| the ability for users to define their own functions in JS and
| might get around to that one day.
| shreyshnaccount wrote:
| I see. despite my not totally unjustified hate of Javascript,
| Im looking forward to it.
| dailyplanet wrote:
| The feet to meters conversion, or vice versa, doesn't work.
| kiemrong08 wrote:
| love it, i bookmarked
| xerxesaa wrote:
| Super cool. I wish this was open source so I could see how you
| did some things, but I understand you've decided to keep it
| closed. Just to satisfy my curiosity, would you mind sharing how
| you did parsing at a high level? Did you use some publicly
| available parser/lexer or did you just implement pattern matching
| yourself with something like regex or other token splitting
| measures?
| ralphb wrote:
| I've found that a super simple way to parse basic expressions
| is a recursive descent parser. It is very simple to implement.
| No need to to break into tokenizer/parser, no need to generate
| an AST, just evaluate the expression while parsing.
| lsferreira42 wrote:
| Do you have an example of a simple parser like that?
| tonyonodi wrote:
| I'm very glad you asked. I wrote my own parser combinator
| library in TypeScript partly based on eulalie[0], so it doesn't
| have a separate lexer and parser and doesn't rely heavily on
| regexes (though it does use them to do things like match a
| single alphanumeric character). I plan on open sourcing this
| library one day once I can tidy up the API because I think it
| would be useful to other people.
|
| But to give you an idea of what that all looks like this is the
| code for the parser that parses the "as a % of" operator:
| append( string("as"), oneOrMore(space),
| optional(append(string("a"), oneOrMore(space))),
| percentSymbol, oneOrMore(space), string("of")
| )
|
| [0] https://github.com/bodil/eulalie
| joe8756438 wrote:
| Thanks for sharing, I had the same question!
|
| I wasn't familiar with Eulalie, that's a really interesting
| approach. I built functionality [0] similar to numpad into a
| larger record-keeping system, Tap [1]. Precedence rules
| kindof scramble my brain so I ended up implementing
| s-expression syntax for Tap formulas.
|
| I ended up writing the parser myself, called sowhat, but used
| a library for tokenization, moo.js [2]. You can see a demo of
| just the sowhat editor here [3].
|
| 0. https://www.tatatap.com/formulas 1.
| https://www.tatatap.com 2. https://github.com/no-context/moo
| 3. https://tatatap-com.github.io/sowhat-editor/
| ttoinou wrote:
| Nice. Could this be done with a VS Code extension ?
| tonyonodi wrote:
| I've never made a VS Code extension, but I think it would be
| possible; no plans to do so currently though.
| nudpiedo wrote:
| there are several inline repl extensions, for many many
| programming languages. One of the first ones to do it was
| clojure, imitating the lighttable IDE. I believe you will find
| similar ones for other languages
| hidelooktropic wrote:
| This is a great demonstration of a feature I feel is greatly
| missing from modern note taking applications like Notion.
| elcritch wrote:
| Looks nice! Making the result blocks non-text is handy. Any plans
| to open source this or sell a desktop version? I've long been a
| fan of http://calca.io but it doesn't run on Linux. There's some
| other versions out there but they tend to be flaky.
| tonyonodi wrote:
| Glad you like it! I've got a desktop version in the works, and
| if the web version gets enough interest I'll finish it off.
| Aeolun wrote:
| Finish it off sounds like you are going to kill it ;)
| ohadpr wrote:
| Fantastic, thank you for implementing one of my future side
| projects. I was planning to build a web-based version of Soulver
| with sharing/collaboration. I hope this can fill that spot for
| me.
| sjinta wrote:
| This is awesome! Some feature requests: it would be great though
| if you could have multiple sessions/tabs in stead of 1. Also a
| clear button would be nice.
| mrcartmeneses wrote:
| Can't you just select all then hit backspace? Asking for a
| friend...
| sjinta wrote:
| When using it to make simple calculations while on a phone I
| think it would be easier than the long click select all
| delete combo, but perhaps this is not really the aim of the
| tool.
| benecollyridam wrote:
| 1=2
|
| 1+1 // = 4
|
| Really nice project though
|
| https://numpad.io?#text/IwXgTAUMDUxA
| [deleted]
| tonyonodi wrote:
| Some people just want to watch the world burn.
|
| No, you're right. I thought I'd prevented it from parsing
| numbers as variables, but apparently not. It's on my todo list
| now.
| amitheonlyone wrote:
| This is really cool. I usually end up doing some weird math
| during development and I usually use the browser developer tools
| which is a bit cumbersome. This might help me replace it.
| runxel wrote:
| Really cool! Only missing a "sum" function.
| tonyonodi wrote:
| Thanks! I'll be implementing a sum (and mean/median/mode)
| function soon.
| barroomhero wrote:
| This is fantastic. I never realized how much I wanted this. Thank
| you for opening my eyes.
|
| Now we need to port to Obsidian.md! haha.
| brospars wrote:
| There is something wrong with the order of operations. When I
| type 2+2*2-6 i get -6 which should be 0.
| simonz05 wrote:
| Yep, this should be evaluated as `(- (+ 2 (* 2 2)) 6)`
| unsafecast wrote:
| It looks like APL order? Right-to-left.
| sneak wrote:
| I would think this might be the first unit test one would write
| for a calculator program.
| [deleted]
| bdwjn wrote:
| Oh there's more:
|
| 9 - 3 ^ 2 = 0
|
| 9 -3 ^ 2 = 18 ???
|
| pi = 3.1415926536
|
| 2 pi = 5.1415926536 ???
|
| sin(3.1415926536 radians) = -0
|
| sin(pi radians) = Incompatible units ???
| wizofaus wrote:
| Seems to assume + if an arithmetic operator is missing?
| tonyonodi wrote:
| This is correct, the idea is that you can type things like
| "6 foot 3 inches" and have it evaluate as an addition. But
| the example shown above is definitely a problem, I'll try
| to think of a work around.
| wizofaus wrote:
| I'd think that rule only makes sense after a symbol
| representing a unit (including potentially 6'3").
| Certainly <number> <named constant> should logically
| assume multiplication.
| unnouinceput wrote:
| One thing it's missing which is trivial to implement. Have a
| little checkbox adjacent to line numbers, default true, that when
| unchecked would simply not parse the calculations, just leave it
| as simple text.
|
| This way writing "and here is a little example of 9^9^9" and
| simply copy paste that to next line would allow me to not have it
| evaluate on text, but only on next line. OF course, a little more
| complicated to implement would be next step of actually select
| the text and within the pop-up have "Don't evaluate". This way
| writing a documentation without having always calculation be in
| your way would be very easy.
|
| Other than that, this looks great ma' dude. Keep it up!
| llimllib wrote:
| It would be cool if "6 minutes / 1 mile in min/km" showed `3:44`
| instead of (in addition to?) `3.7268`
|
| I wrote my own little calculator, much less general than this, to
| answer running time questions like "to run an 18 minute 5k, what
| would my mile pace be"? and it would be neat if that were cleanly
| solvable in a tool like this
| tonyonodi wrote:
| Yeah, that's a feature I really wanted to get out before my
| launch deadline but sadly it didn't make the cut. Soon though.
| carapace wrote:
| See also Frink: https://frinklang.org/
|
| > Frink is a practical calculating tool and programming language
| designed to make physical calculations simple, to help ensure
| that answers come out right, and to make a tool that's really
| useful in the real world. It tracks units of measure (feet,
| meters, kilograms, watts, etc.) through all calculations,
| allowing you to mix units of measure transparently, and helps you
| easily verify that your answers make sense. It also contains a
| large data file of physical quantities...
| felipelalli wrote:
| It would be nice to be an emacs extension. :)
| nudpiedo wrote:
| Why limit it to arithmetic?
|
| Looks much like the original idea behind lighttable IDE which is
| basically a REPL plugin that allows to evaluate certain lines
| within it. There are several similar projects around.
| tonyonodi wrote:
| Because Turing completeness scares me!
|
| I was a big fan of Light Table when it first came out and the
| developers behind it have gone on to do some really interesting
| things, but I want to keep this project more limited in scope
| for now.
| [deleted]
| nonoesp wrote:
| I have a side project slightly similar to the functionality your
| tool offers focused on expense tracking (or other measures) over
| time, adding date parsing to the equation in order to plot
| metrics into a graph and with tags and locations for filtering.
| tonyonodi wrote:
| Nice! Can you send a link or is it still in development?
| Dries007 wrote:
| I'm (slowly) working on something that can eat up PSD2 data
| from banks and parse it into some usable data, but I'm bad at
| nicely presenting stuff. It would be great to see your tool and
| get some inspiration, or maybe even use it.
| botinko wrote:
| 2+2*2-3 calculated as 0. WAT?
| jbaczuk wrote:
| Nice! What is the long term goal with numpad?
| Lanrei wrote:
| Inline whitespace summation at the same time as mathematical
| operations seems like a problem. I don't think that there's a
| standard order of operation for that sort of thing.
| ascar wrote:
| Minor bug report: for whatever reason entering a space on my
| Android keyboard enters the next suggestion on your editor.
| That's a feature I explicitly disabled, but is active on your
| website. On top of that if that enters an unrenderable character
| I see a red dot that's undeletable.
| MrGilbert wrote:
| Really cool. Minor user pain:
|
| When starting a new line, and the first character is 'e', it gets
| evaluated to the euler constant. Would be cool if you could find
| a way to prevent that. :)
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(page generated 2022-08-17 23:00 UTC)