Thanks Jordan, filter was, of course, what I was looking for. Just got carried away, when I saw it had a mapFn as an option and thought I could use that somehow to cut a corner. By the way, and kind of off topic, why is mutating a list mid-iteration bad news? I'm just curious, and obviously not a computer engineer.
ons 3 maj 2017 kl 23:37 skrev Jordan Harband <[email protected]>: > Good point :-) i guess as the destination index it makes sense, altho i've > always thought of it as the source index. > > On Wed, May 3, 2017 at 12:58 PM, T.J. Crowder < > [email protected]> wrote: > >> On Wed, May 3, 2017 at 7:35 PM, Jordan Harband <[email protected]> wrote: >> >>> (an index in Array.from wouldn't make sense, because Array.from takes an >>> iterable *or* an arraylike - and only an arraylike would be guaranteed to >>> have an index, or even a "list" at all) >>> >> >> And yet, [it provides one](https://tc39.github.io/ecma262/#sec-array.from). >> It's the index that will be used to set the array entry from the result. >> It's only the third argument (the source object) that `Array.from` doesn't >> include. >> >> -- T.J. Crowder >> > >
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