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45 lines
1.5 KiB
45 lines
1.5 KiB
3 years ago
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// 0 -> Array#forEach
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// 1 -> Array#map
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// 2 -> Array#filter
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// 3 -> Array#some
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// 4 -> Array#every
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// 5 -> Array#find
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// 6 -> Array#findIndex
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var ctx = require('./_ctx');
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var IObject = require('./_iobject');
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var toObject = require('./_to-object');
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var toLength = require('./_to-length');
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var asc = require('./_array-species-create');
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module.exports = function (TYPE, $create) {
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var IS_MAP = TYPE == 1;
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var IS_FILTER = TYPE == 2;
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var IS_SOME = TYPE == 3;
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var IS_EVERY = TYPE == 4;
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var IS_FIND_INDEX = TYPE == 6;
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var NO_HOLES = TYPE == 5 || IS_FIND_INDEX;
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var create = $create || asc;
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return function ($this, callbackfn, that) {
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var O = toObject($this);
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var self = IObject(O);
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var f = ctx(callbackfn, that, 3);
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var length = toLength(self.length);
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var index = 0;
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var result = IS_MAP ? create($this, length) : IS_FILTER ? create($this, 0) : undefined;
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var val, res;
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for (;length > index; index++) if (NO_HOLES || index in self) {
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val = self[index];
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res = f(val, index, O);
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if (TYPE) {
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if (IS_MAP) result[index] = res; // map
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else if (res) switch (TYPE) {
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case 3: return true; // some
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case 5: return val; // find
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case 6: return index; // findIndex
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case 2: result.push(val); // filter
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} else if (IS_EVERY) return false; // every
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}
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}
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return IS_FIND_INDEX ? -1 : IS_SOME || IS_EVERY ? IS_EVERY : result;
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};
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};
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