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/*===
JOIN
===*/
/* Array prototype functions are generic and can be used with objects
* other than arrays. Here, for instance, we use Array.prototype.toString()
* on a custom object.
*
* Because the custom object has a 'join' function, it is called.
*/
var obj = { join: function() { return 'JOIN'; } };
print(Array.prototype.toString.apply(obj));