Empty an array methods

emptyArray.js

A = [];
// This is perfect if you don't have references to the original array A anywhere else because this actually creates a brand new (empty) array. 

A.length = 0;
// This will clear the existing array by setting its length to 0

A.splice(0,A.length);
// Using .splice() will work perfectly, but since .splice() function will return an array with all the removed items, it will actually return a copy of the original array. Benchmarks suggests that this has no effect on performance whatsoever.

while(A.length > 0) {
    A.pop();
};
// This solution is not very succinct and it is also the slowest solution

From the stackoverflow answer: http://stackoverflow.com/a/1232046