How to empty an javascript array?

Question

var arr = [-3, -34, 1, 32, -100];

How can I remove all items and just leave an empty array?

And is it a good idea to use this?

arr = [];

Thank you very much!

Answer 1

one of those two:

var a = Array();
var a = [];

Answer 2

Just as you say:

arr = [];

Answer 3

Using arr = []; to empty the array is far more efficient than doing something like looping and unsetting each key, or unsetting and then recreating the object.

Answer 4

While you can set it to a new array like some of the other answers, I prefer to use the clear() method as such:

array.clear();

Answer 5

The following article should answer part 2. http://stackoverflow.com/questions/864516/what-is-javascript-garbage-collection

Answer 6

Out of box idea:

while(arr.length) arr.pop();