How to remove elements from Array?

Question

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how to empty an array in JavaScript

How to remove all items from jQuery array?

I have array var myArray = [];, I want to clear all items in this array on every post back.

That is not a `jQuery` array. – Rudi Visser Jul 18 '12 at 14:25 — Rudi Visser, Jul 18 '12 at 14:25
implied facepalm. javascript is NOT jQuery.... – hvgotcodes Jul 18 '12 at 14:26 — hvgotcodes, Jul 18 '12 at 14:26
looks like this array is already cleared :) – Mukus Nov 09 '16 at 03:26 — Mukus, Nov 09 '16 at 03:26

Pointy · Accepted Answer · 2013-11-09T15:40:46.277

35

Simplest thing to do is just

myArray = [];

again.

edit — as pointed out in the comments, and in answers to other questions, another "simplest thing" is

myArray.length = 0;

and that has the advantage of retaining the same array object.

edited Nov 09 '13 at 15:40

answered Jul 18 '12 at 14:25

Pointy

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not enough jQuery. – jAndy Jul 18 '12 at 14:26
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well he could always call it `$myArray` – Pointy Jul 18 '12 at 14:26
@jAndy I don't think that you need jQuery for everything..... – starbeamrainbowlabs Jul 18 '12 at 14:32
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@starbeamrainbowlabs - It was a joke, most likely a reference to [this](http://www.doxdesk.com/img/updates/20091116-so-large.gif). – James Allardice Jul 18 '12 at 14:35
@jAndy I get it now! Thanks :) – starbeamrainbowlabs Jul 18 '12 at 14:46
4

This does NOT empty an array. This just assigns NEW empty array to that variable. `.length` solution works fine, while this does not in this use-case: `var obj = {arr: []}; var a = obj.arr; a.push('elem'); a.length = 0; console.log(obj);` vs `var obj = {arr: []}; var a = obj.arr; a.push('elem'); a = []; console.log(obj);` – Marius Balčytis Jun 03 '13 at 09:49

score 10 · Answer 2 · answered Jul 18 '12 at 14:28

10

you can remove all item in myArray using array length, it's common pattern.

try this

var myArray = [1, 2, 3];    
myArray.length = 0; // remove all item

answered Jul 18 '12 at 14:28

blueiur

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score 1 · Answer 3 · answered Jul 18 '12 at 14:25

There is no such thing as a jQuery array, that's just a javascript array. When a page posts back, it re-renders and all of the javascript is re-run, you don't need to clear the contents of the array.

if, during execution of the page, you wanted to clear a javascript array, just re-initialize it as a new, blank array:

myArray = []; // no var, we are just initializing not declaring

score 1 · Answer 4 · edited Nov 10 '15 at 04:21

1

To clear the array values you can do a simple:

myarray = [];

P.s.

jQuery != javascript

edited Nov 10 '15 at 04:21

Anik Islam Abhi

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answered Jul 18 '12 at 14:26

napolux

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score 0 · Answer 5 · answered Jul 18 '12 at 14:26

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Here is a list of methods you can do on an Array in javascript

answered Jul 18 '12 at 14:26

Evan Larsen

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link is broken... – Pipo May 02 '21 at 18:42

How to remove elements from Array?

5 Answers5