Note that an equivalent of both `.map` and `.filter` already exists in ES6: its name is "generator expression". For instance:
``` array.filter(pred).map(transf) ``` becomes: ``` (for (let x of iter) if (pred(x)) transf(x)) ``` —Claude Le 28 août 2013 à 17:27, Forbes Lindesay <for...@lindesay.co.uk> a écrit : > The thing about `.map` and `.filter` is that it would be easy enough to > create functional versions: > > ```js > function* map(array, fn) { > for (var x of array) { > yield fn(x) > } > } > ``` > > But harder to create methods: > > ```js > Iteratable.prototype.map = function(fn) { > for (var x of this) { > yield fn(x) > } > } > ``` > > The reason being that not all iteratables share a prototype (to my > knowledge). > > _______________________________________________ > es-discuss mailing list > es-discuss@mozilla.org > https://mail.mozilla.org/listinfo/es-discuss _______________________________________________ es-discuss mailing list es-discuss@mozilla.org https://mail.mozilla.org/listinfo/es-discuss