See https://github.com/bterlson/proposal-flatMap
On Fri, May 19, 2017 at 12:54 PM, Frankie Bagnardi <[email protected]> wrote: > I often do the `.reduce((xs, ys) => xs.concat(ys))` and I feel the need to > leave a comment explaining what it does. > > +1 to this proposal. > > > On Fri, May 19, 2017 at 12:44 PM, Luan Nico <luannico27+es-discuss@gmail. > com> wrote: > >> I always surprise myself finding out there's no native way to flat an >> array. I know it's easy to implement, but to increase legibility I propose >> creating one of two options (either suffice, I believe): >> >> - `flatMap` : regular map, but flattens the array afterwards >> - `flatten` : just call on an array and get a new flattened array >> >> Some examples usages of both: >> >> With `flatMap`: >> ``` >> const numbers = [12, 35]; >> const divisors = numbers.flatMap(factors); >> ``` >> >> With `flatten`: >> ``` >> const numbers = [12, 35]; >> const divisors = numbers.map(factors).flatten(); >> ``` >> >> Flattening an array is converting something like `[1, [2, 3], 4]` to `[1, >> 2, 3, 4]`. >> There is also need to choose whether it's deep or shallow. >> >> I suggest adding a `flatten` shallow method, as that would be useful in >> all scenarios described. >> >> Example implementation: >> >> ``` >> Array.prototype.flatten = function () { >> return [].concat.apply([], this); >> }; >> ``` >> >> What are your opinions about it? >> >> _______________________________________________ >> es-discuss mailing list >> [email protected] >> https://mail.mozilla.org/listinfo/es-discuss >> >> > > _______________________________________________ > es-discuss mailing list > [email protected] > https://mail.mozilla.org/listinfo/es-discuss > >
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