What would be the fastest way of clearing an array without
deleting it? Could you set all values to null or undefined and it
would work? For example, say I have an array of 4 numbers: 3, 4, 5,
6. Now, for some reason I want to clear all the values and set only
one value, so now I have an array of 1 number with a length of only
1: 7. How can I do this without deleting the array? Remeber, I only
want this array to have a length of one, not 4.