75 lines
2.9 KiB
JavaScript
75 lines
2.9 KiB
JavaScript
|
'use strict';
|
||
|
|
var bind = require('../internals/function-bind-context');
|
||
|
|
var uncurryThis = require('../internals/function-uncurry-this');
|
||
|
|
var IndexedObject = require('../internals/indexed-object');
|
||
|
|
var toObject = require('../internals/to-object');
|
||
|
|
var lengthOfArrayLike = require('../internals/length-of-array-like');
|
||
|
|
var arraySpeciesCreate = require('../internals/array-species-create');
|
||
|
|
|
||
|
|
var push = uncurryThis([].push);
|
||
|
|
|
||
|
|
// `Array.prototype.{ forEach, map, filter, some, every, find, findIndex, filterReject }` methods implementation
|
||
|
|
var createMethod = function (TYPE) {
|
||
|
|
var IS_MAP = TYPE === 1;
|
||
|
|
var IS_FILTER = TYPE === 2;
|
||
|
|
var IS_SOME = TYPE === 3;
|
||
|
|
var IS_EVERY = TYPE === 4;
|
||
|
|
var IS_FIND_INDEX = TYPE === 6;
|
||
|
|
var IS_FILTER_REJECT = TYPE === 7;
|
||
|
|
var NO_HOLES = TYPE === 5 || IS_FIND_INDEX;
|
||
|
|
return function ($this, callbackfn, that, specificCreate) {
|
||
|
|
var O = toObject($this);
|
||
|
|
var self = IndexedObject(O);
|
||
|
|
var length = lengthOfArrayLike(self);
|
||
|
|
var boundFunction = bind(callbackfn, that);
|
||
|
|
var index = 0;
|
||
|
|
var create = specificCreate || arraySpeciesCreate;
|
||
|
|
var target = IS_MAP ? create($this, length) : IS_FILTER || IS_FILTER_REJECT ? create($this, 0) : undefined;
|
||
|
|
var value, result;
|
||
|
|
for (;length > index; index++) if (NO_HOLES || index in self) {
|
||
|
|
value = self[index];
|
||
|
|
result = boundFunction(value, index, O);
|
||
|
|
if (TYPE) {
|
||
|
|
if (IS_MAP) target[index] = result; // map
|
||
|
|
else if (result) switch (TYPE) {
|
||
|
|
case 3: return true; // some
|
||
|
|
case 5: return value; // find
|
||
|
|
case 6: return index; // findIndex
|
||
|
|
case 2: push(target, value); // filter
|
||
|
|
} else switch (TYPE) {
|
||
|
|
case 4: return false; // every
|
||
|
|
case 7: push(target, value); // filterReject
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return IS_FIND_INDEX ? -1 : IS_SOME || IS_EVERY ? IS_EVERY : target;
|
||
|
|
};
|
||
|
|
};
|
||
|
|
|
||
|
|
module.exports = {
|
||
|
|
// `Array.prototype.forEach` method
|
||
|
|
// https://tc39.es/ecma262/#sec-array.prototype.foreach
|
||
|
|
forEach: createMethod(0),
|
||
|
|
// `Array.prototype.map` method
|
||
|
|
// https://tc39.es/ecma262/#sec-array.prototype.map
|
||
|
|
map: createMethod(1),
|
||
|
|
// `Array.prototype.filter` method
|
||
|
|
// https://tc39.es/ecma262/#sec-array.prototype.filter
|
||
|
|
filter: createMethod(2),
|
||
|
|
// `Array.prototype.some` method
|
||
|
|
// https://tc39.es/ecma262/#sec-array.prototype.some
|
||
|
|
some: createMethod(3),
|
||
|
|
// `Array.prototype.every` method
|
||
|
|
// https://tc39.es/ecma262/#sec-array.prototype.every
|
||
|
|
every: createMethod(4),
|
||
|
|
// `Array.prototype.find` method
|
||
|
|
// https://tc39.es/ecma262/#sec-array.prototype.find
|
||
|
|
find: createMethod(5),
|
||
|
|
// `Array.prototype.findIndex` method
|
||
|
|
// https://tc39.es/ecma262/#sec-array.prototype.findIndex
|
||
|
|
findIndex: createMethod(6),
|
||
|
|
// `Array.prototype.filterReject` method
|
||
|
|
// https://github.com/tc39/proposal-array-filtering
|
||
|
|
filterReject: createMethod(7)
|
||
|
|
};
|