Subj : delete operator
To   : netscape.public.mozilla.jseng
From : Oscar
Date : Mon Sep 27 2004 08:20 pm

Hi all,

I have a question regarding spidermonkeys support of the delete operator.
It seems that contrary to my intepretation of ESMP-262 3rd edition we do not
evaluate the unary expressions that follow the delete operator; instead we
simply disregard the nodes that make out the unary expression and emmit a
JSOP_TRUE.


I just want to double check before adding a bug to bugzilla.

The code of primary concern is
(
js_EmitTree
....
case TOK_DELETE:
        /* Under ECMA 3, deleting a non-reference returns true. */
        pn2 = pn->pn_kid;
        switch (pn2->pn_type) {
          case TOK_NAME:
          ...
          break;
          case TOK_DOT:
          ...
          break;
          case TOK_LB:
          ...
          break;
          default:
            if (js_Emit1(cx, cg, JSOP_TRUE) < 0)
                return JS_FALSE;
        }
        break;
)

Best regards
Oscar

.