JavaScript array delete Special

Question

I have an array like:

var abc = ["a","b","c"];

And the indexes are 0,1,2

Suppose, I want to delete the 2nd item "b" and I the indexes swipe!

Out put:

abc = ["a","c"]

and the indexes are 0,1

How can I achieve this?

Are the indexes always 0, 1, and 2? – Qantas 94 Heavy Mar 07 '13 at 11:12 — Qantas 94 Heavy, Mar 07 '13 at 11:12
yes, always starts from 0 – Shahid Karimi Mar 07 '13 at 11:14 — Shahid Karimi, Mar 07 '13 at 11:14

Denys Séguret · Accepted Answer · 2013-03-07T11:24:32.773

3

Use the splice function :

abc.splice(1,1) // from index 1, removes 1 element

Be careful that this changes the original array.

edited Mar 07 '13 at 11:24

answered Mar 07 '13 at 11:14

Denys Séguret

No problem, can you bit explain the parameters? – Shahid Karimi Mar 07 '13 at 11:17
I linked to the complete documentation. But here the first argument is the position and the second one the number of elements to remove. – Denys Séguret Mar 07 '13 at 11:17
1

+1 but would prefer wording the other way around (`from index 1, removes 1 element`) – Paul S. Mar 07 '13 at 11:21
@PaulS. Good idea. I edited (you could have to). – Denys Séguret Mar 07 '13 at 11:24
@dystroy Yes, but I would feel `This edit is too minor; [...] edits should be substantive improvements addressing multiple issues in the post.` If you want to offer a way to do the same without modifying the original array, you could also add `var ac = abc.slice().splice(1, 1);` after your warning. (This time I'd feel the change too radical) – Paul S. Mar 07 '13 at 11:32
1

@PaulS. I just [had a look](http://stackoverflow.com/users/1615483/paul-s?tab=activity). I'm not surprised to see you don't edit too much I see. But in this precise case I don't feel the need for the cloning addition, as *"I like concise, easy-to-read questions and answers"* :p – Denys Séguret Mar 07 '13 at 11:40

score 0 · Answer 2 · answered Mar 07 '13 at 11:14

0

Use splice(). E.g:

abc.splice(1, 1);

would perform what you wanted in your example. abc[1] would now be "c".

answered Mar 07 '13 at 11:14

Matt Cain

score 0 · Answer 3 · answered Mar 07 '13 at 11:16

0

You can use the array splice abc.splice(1,1);

answered Mar 07 '13 at 11:16

karthick

score 0 · Answer 4 · edited Mar 07 '13 at 11:34

0

Have a look on it... I think this is what you want...

var arr = ["a","b","c"];

arr.splice(1,1);

alert("["+arr.indexOf('a')+","+arr.indexOf('c')+"]");

edited Mar 07 '13 at 11:34

Paul S.

answered Mar 07 '13 at 11:34

Aman Gupta

4 Answers4