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JavaScript's functional programming helper library.
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define(['./sortedIndex', './findIndex', './_createIndexFinder'], function (sortedIndex, findIndex, _createIndexFinder) {
// Return the position of the first occurrence of an item in an array,
// or -1 if the item is not included in the array.
// If the array is large and already in sort order, pass `true`
// for **isSorted** to use binary search.
var indexOf = _createIndexFinder(1, findIndex, sortedIndex);
return indexOf;
});