On Tue, Oct 7, 2014 at 1:20 PM, Claude Pache <[email protected]> wrote:
> > > Le 7 oct. 2014 à 21:32, Dmitry Soshnikov <[email protected]> a > écrit : > > > > But all the things from above stands: it's confusing since doesn't > explain whether it's pre- or post- map, and takes too much at > implementation. > > My previous example could have been written as: `UInt32Array.from('abc', x > => x.codePointAt(0))` (recalling that strings are iterable in ES6). My > mapping is neither a pre-, nor a post-map. It's just a map which transforms > a kind of value (a Unicode character) into another kind of value (a 32-bit > integer). > > This code example is a good justification of the "an iterable doesn't have own `map` method", but other than that, it's clearly pre-mapping, since each element of the result is mapped before being set. The code is semantically equivalent to: ``` UInt32Array.from('abc'.toArray().map(x => x.codePointAt(0)); ``` Dmitry
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