Most efficient way to create a zero filled JavaScript array?

Question

What is the most efficient way to create an arbitrary length zero filled array in JavaScript?

Answer 1

If you need to create many zero filled arrays of different lengths during the execution of your code, the fastest way I've found to achieve this is to create a zero array once, using one of the methods mentioned on this topic, of a length which you know will never be exceeded, and then slice that array as necessary.

For example (using the function from the chosen answer above to initialize the array), create a zero filled array of length maxLength, as a variable visible to the code that needs zero arrays:

var zero = newFilledArray(maxLength, 0);

Now slice this array everytime you need a zero filled array of length requiredLength < maxLength:

zero.slice(0, requiredLength);

I was creating zero filled arrays thousands of times during execution of my code, this speeded up the process tremendously.