65 lines
2.5 KiB
JavaScript
65 lines
2.5 KiB
JavaScript
var bind = require('../internals/bind-context');
|
|
var IndexedObject = require('../internals/indexed-object');
|
|
var toObject = require('../internals/to-object');
|
|
var toLength = require('../internals/to-length');
|
|
var arraySpeciesCreate = require('../internals/array-species-create');
|
|
|
|
var push = [].push;
|
|
|
|
// `Array.prototype.{ forEach, map, filter, some, every, find, findIndex }` 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 NO_HOLES = TYPE == 5 || IS_FIND_INDEX;
|
|
return function ($this, callbackfn, that, specificCreate) {
|
|
var O = toObject($this);
|
|
var self = IndexedObject(O);
|
|
var boundFunction = bind(callbackfn, that, 3);
|
|
var length = toLength(self.length);
|
|
var index = 0;
|
|
var create = specificCreate || arraySpeciesCreate;
|
|
var target = IS_MAP ? create($this, length) : IS_FILTER ? create($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.call(target, value); // filter
|
|
} else if (IS_EVERY) return false; // every
|
|
}
|
|
}
|
|
return IS_FIND_INDEX ? -1 : IS_SOME || IS_EVERY ? IS_EVERY : target;
|
|
};
|
|
};
|
|
|
|
module.exports = {
|
|
// `Array.prototype.forEach` method
|
|
// https://tc39.github.io/ecma262/#sec-array.prototype.foreach
|
|
forEach: createMethod(0),
|
|
// `Array.prototype.map` method
|
|
// https://tc39.github.io/ecma262/#sec-array.prototype.map
|
|
map: createMethod(1),
|
|
// `Array.prototype.filter` method
|
|
// https://tc39.github.io/ecma262/#sec-array.prototype.filter
|
|
filter: createMethod(2),
|
|
// `Array.prototype.some` method
|
|
// https://tc39.github.io/ecma262/#sec-array.prototype.some
|
|
some: createMethod(3),
|
|
// `Array.prototype.every` method
|
|
// https://tc39.github.io/ecma262/#sec-array.prototype.every
|
|
every: createMethod(4),
|
|
// `Array.prototype.find` method
|
|
// https://tc39.github.io/ecma262/#sec-array.prototype.find
|
|
find: createMethod(5),
|
|
// `Array.prototype.findIndex` method
|
|
// https://tc39.github.io/ecma262/#sec-array.prototype.findIndex
|
|
findIndex: createMethod(6)
|
|
};
|