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