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| const applyMapFn = (fn, {value}, thisArg) => fn.apply(null, value.reverse()); | |
| const generators = { | |
| *filter([map, iteratee, thisArg]) { | |
| const iterator = map.entries(); | |
| let nextItem = iterator.next(); | |
| while (!nextItem.done) { | |
| const {value} = nextItem; | |
| const result = iteratee.call(thisArg, value[1], value[0], map); | |
| if (result) { | |
| yield nextItem.value; | |
| } | |
| nextItem = iterator.next(); | |
| }; | |
| }, | |
| *map([map, iteratee, thisArg]) { | |
| const iterator = map.entries(); | |
| let nextItem = iterator.next(); | |
| while (!nextItem.done) { | |
| const {value} = nextItem; | |
| yield iteratee.call(thisArg, value[1], value[0], map); | |
| nextItem = iterator.next(); | |
| } | |
| }, | |
| *reduce([map, iteratee, initialValue, thisArg]) { | |
| const iterator = map.entries(); | |
| let nextItem = iterator.next(); | |
| let reducedValue = initialValue; | |
| while (!nextItem.done) { | |
| const {value} = nextItem; | |
| reducedValue = iteratee.call(thisArg, value, value[1], value[0], map); | |
| nextItem = iterator.next(); | |
| } | |
| yield reducedValue; | |
| } | |
| }; | |
| export default ['filter', 'map', 'reduce'].reduce((obj, fnName) => { | |
| obj[fnName] = function() { | |
| return new Map(generators[fnName](arguments)); | |
| }; | |
| return obj; | |
| }, {}); |
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