The fill() method fills each array slot with the same specified value.

Now, to fill these empty slots with a default value such as 0, you can use the Array.fill() method. When you pass a single parameter to the Array() constructor, it creates an empty array of that size. ~ simple example.To quickly create an array of size n in JavaScript, you can use the Array() constructor. Return call_user_func_array (array( $this -> obj, $this -> method ), array( $a, $b, $this -> key ))

If you need to use usort with a key in the calling method, I wrote this as a utility:

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Javascript remove empty slots in array