I'm curious as to the fate of the famous JavaScript 1.6 Array extras (indexOf, lastIndexOf, forEach, map, filter, every, some) in ECMAScript 4. As a JavaScript developer, I've come to greatly appreciate the functional-style flexibility these methods offer, and have incorporated implementations of them into my everyday JS toolkit. (See: http://developer.mozilla.org/en/docs/New_in_JavaScript_1.6#Array_extras and http://www.webreference.com/programming/javascript/ncz/column4/index.html if you're not familiar with the Array extras.)
However, according to the current ECMAScript 4 specification, these methods appear to be missing from Array.prototype: http://developer.mozilla.org/es4/spec/chapter_19_native_objects.html#array_objects Given the significant performance boost from moving this sort of iteration into machine code from interpreted code, I for one would greatly appreciate an official endorsement of these methods in ECMAScript 4. They certainly seem to fit within the spirit of the existing ECMAScript 3 native array methods (slice, splice, etc.) and have parallels in the String prototype (indexOf, lastIndexOf). Is there a reason not to include them in ECMA 4? If so, what might that be? Thanks, David Golightly
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