Decrement array length in Javascript

Question

I just ran across this javascript snippet:

myArray.length--;

What does it do exactly?

stackoverflow.com/questions/626500/array-length

Chuck Norris
– Chuck Norris

2012-01-09 07:06:55 +00:00
Commented Jan 9, 2012 at 7:06 — Chuck Norris
– Chuck Norris, Commented Jan 9, 2012 at 7:06

Luis Perez · Accepted Answer · 2012-01-09 07:09:42Z

4

This removes the last items in the array.

var myArray = [1, 2, 3];
myArray.length--;
alert(myArray);

The output is:

[1, 2]

answered Jan 9, 2012 at 7:09

Luis Perez

28.2k11 gold badges85 silver badges81 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

user457015 Over a year ago

interesting does not know that!

Sergio Tulentsev · Accepted Answer · 2012-01-09 07:08:30Z

3

Simple experimentation shows that it chops off last element of the array.

> var a = [1, 2, 3];
=> undefined
> a
=> [1, 2, 3]
> a.length--
=> 3
> a
=> [1, 2]

answered Jan 9, 2012 at 7:08

Sergio Tulentsev

231k43 gold badges381 silver badges373 bronze badges

3 Comments

Sam Washburn Over a year ago

What do you use for an interpreter? I've never seen an interactive javascript console like that.

Sergio Tulentsev Over a year ago

Chrome's javascript console :-)

Luis Perez Over a year ago

Which by the way you get to by pressing F12, then clicking the >= toolbar icon on the very bottom. That and other features in chrome even allow you to experiment and alter the current page. (The other browsers offer some versions of this feature - also try the jsFiddle website)

Collectives™ on Stack Overflow

Decrement array length in Javascript

2 Answers 2

1 Comment

3 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

3 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related