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JavaScript's functional programming helper library.
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define(['./_isArrayLike', './values', './indexOf'], function (_isArrayLike, values, indexOf) {
// Determine if the array or object contains a given item (using `===`).
function contains(obj, item, fromIndex, guard) {
if (!_isArrayLike(obj)) obj = values(obj);
if (typeof fromIndex != 'number' || guard) fromIndex = 0;
return indexOf(obj, item, fromIndex) >= 0;
}
return contains;
});