On Wed, Oct 14, 2009 at 7:40 PM, Jim Blandy <j...@mozilla.com> wrote: > There's one specific kind of contextual information that's being looked at > askance here: knowledge of the expression surrounding the call that invoked > you. Perl lets subroutines check what sort of value their caller is > expecting; that hasn't aged well.
Our implementation of String.prototype.match checks the context in which it's called, to see if it need bother with the expense of constructing the result array (it needn't, if the match call is being used simply as a test, which isn't unheard of on the web). That optimization aged pretty well, and indeed benchmarks often encourage such context-sensitivity. Mike _______________________________________________ es-discuss mailing list es-discuss@mozilla.org https://mail.mozilla.org/listinfo/es-discuss
