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44 lines
1.5 KiB
44 lines
1.5 KiB
// 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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