--- /dev/null
+// 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;
+ };
+};
\ No newline at end of file