21 lines
788 B
JavaScript
21 lines
788 B
JavaScript
// false -> Array#indexOf
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// true -> Array#includes
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var toIObject = require('./_to-iobject')
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, toLength = require('./_to-length')
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, toIndex = require('./_to-index');
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module.exports = function(IS_INCLUDES){
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return function($this, el, fromIndex){
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var O = toIObject($this)
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, length = toLength(O.length)
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, index = toIndex(fromIndex, length)
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, value;
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// Array#includes uses SameValueZero equality algorithm
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if(IS_INCLUDES && el != el)while(length > index){
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value = O[index++];
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if(value != value)return true;
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// Array#toIndex ignores holes, Array#includes - not
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} else for(;length > index; index++)if(IS_INCLUDES || index in O){
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if(O[index] === el)return IS_INCLUDES || index || 0;
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} return !IS_INCLUDES && -1;
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};
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}; |