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indexOf
The index at which to begin the search. Defaults to 0, i.e. the whole array will be searched. If the index is greater than or equal to the length of the array, -1 is returned, i.e. the array will not be searched. If negative, it is taken as the offset from the end of the array. Note that even when the index is negative, the array is still searched from front to back. If the calculated index is less than 0, the whole array will be searched.
current implementation isn't ES5 compliant.
source: https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/indexOf
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