On Sat, Aug 5, 2017 at 11:18 AM, Naveen Chawla <[email protected]> wrote: > I've often needed to cache array elements by a unique key each > element has, for quick access.
Yes, please. I've needed this in every codebase I've ever worked on. For me, having it in the standard lib would be a win. (Yes, you can easily do it by (ab)using `reduce`, but A) It's arguably an abusage [one I'm increasingly resigning myself to], and B) Why keep re-writing it?) Some off-the-cuff suggestions: 1. Put it on `Object`: `Object.from`. 2. Have a Map version: `Map.from`. 3. Accept any iterable, not just an array. 4. Accept a string, Symbol, or callback: If a string or Symbol, use the matching property as the key for the result. If a callback, use the callback's return value (your example). 5. Optionally accept the object or map rather than creating a new one. So something like: `Object.from(iterable, indexer, target = Object.create(null))` and `Map.from(iterable, indexer, target = new Map)` -- T.J. Crowder
_______________________________________________ es-discuss mailing list [email protected] https://mail.mozilla.org/listinfo/es-discuss
