> On May 22, 2016, at 1:55 PM, Šime Vidas <[email protected]> wrote:
>
> Say I have an array over which I need to iterate multiple times, but I need
> the index value only some of the time. Is it possible to create a custom
> iterator which auto-detects when I need the index and feeds me entries()
> instead of values() in those cases? For example:
>
> array[Symbol.iterator] = /* some magic here */
>
> for (let elem of array) { /* values() iterator is used automatically */ }
> for (let [i, elem] of array) { /* entries() iterator is used automatically */
> }
The ES internal protocol design assumes that you would to this as follows:
for (let elem of array.entries()) { /* values() iterator is explicitly used */ }
for (let [i, elem] of array.elements()) { /* entries() iterator is explicitly
used */ }
No magic is necessary.
Allen
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