43 lines
1.5 KiB
JavaScript
43 lines
1.5 KiB
JavaScript
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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('./$.ctx')
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, IObject = require('./$.iobject')
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, toObject = require('./$.to-object')
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, toLength = require('./$.to-length')
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, asc = require('./$.array-species-create');
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module.exports = function(TYPE){
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var IS_MAP = TYPE == 1
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, IS_FILTER = TYPE == 2
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, IS_SOME = TYPE == 3
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, IS_EVERY = TYPE == 4
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, IS_FIND_INDEX = TYPE == 6
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, NO_HOLES = TYPE == 5 || IS_FIND_INDEX;
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return function($this, callbackfn, that){
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var O = toObject($this)
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, self = IObject(O)
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, f = ctx(callbackfn, that, 3)
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, length = toLength(self.length)
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, index = 0
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, result = IS_MAP ? asc($this, length) : IS_FILTER ? asc($this, 0) : undefined
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, 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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