Is JavaScript's array.clear() not a function? [duplicate]

Question

This question already has answers here:

How do I empty an array in JavaScript? (18 answers)

I'm trying to empty an array containing my drawn coordinates when a button "clear" is pressed.

When I call drawnDivs.clear(), I get an error that it is not a function. drawnDivs is certainly an array, and I have Firebug console.logs printing things out. It's hosted here.

Answer 1

Nope, it's not. But drawnDivs.length = 0 should work.

Answer 2

drawnDivs = [];

Answer 3

It was answered in Stack Overflow question How do I empty an array in JavaScript?.

Two examples from the answer:

var A = ['some', 'values', 'here'];

//Method 1

//(This was my original answer to the question)

A = [];




// Method 2 (as suggested by Matthew Crumley)

A.length = 0

And here is a nice write up on these two methods by Dr. Axel Rauschmayer.

Answer 4

An optimized way to do it is:

while (arr.pop()) {}

See http://jsperf.com/kbk-clear-array/2.

Answer 5

You could alternately use the Prototype library and then, use Prototype's clear() method.