On Feb 16, 7:29 am, Yaffle <[email protected]> wrote:
> Hello,
>
> Why with JavaScript <= 1.5, Array.prototype._each method doesn't use
> a context object
>
> like
>
> Array.prototype.forEach(callback[, thisObject]) in JavaScript 1.6
>
> or
>
> Enumerable.prototype.each(iterator[, context]) ?
>
> thank you.
Because `Array.prototype._each` (defined by Prototype.js) is bound to
custom `each` implementation when native `Array.prototype.forEach` is
unavailable (e.g. in older versions of Firefox). That custom
implementation currently looks like:
function each(iterator) {
for (var i = 0, length = this.length; i < length; i++)
iterator(this[i]);
}
while, to be consistent with `forEach`, it would need to look like:
function each(iterator, context) {
for (var i = 0, length = this.length; i < length; i++)
iterator.call(context, this[i], i, this);
}
--
kangax
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