String with Comma separated numbers to array of integer in javascript

Question

I am converting String with Comma separated numbers to a array of integer like,

 var string = "1,2,3,4"; 
 var array = string.replace(/, +/g, ",").split(",").map(Number);

it returns array = [1,2,3,4];

But when ,

 var string = ""; 
 var array = string.replace(/, +/g, ",").split(",").map(Number);

it returns array = [0];

I was expecting it to return array = []; can someone say why this is happening.

Edited, So I suppose I have to add a check whether string is empty or not then only split it . — Hmahwish, Apr 21 '15 at 11:39
related: [How to convert comma separated string into numeric array in javascript](https://stackoverflow.com/q/16396124/1048572) — Bergi, Jun 22 '22 at 20:19

Ghassen Rjab · Accepted Answer · 2018-01-18T21:30:47.863

14

I would recommend this:

var array;
if (string.length === 0) {
    array = new Array();
} else {
    array = string.replace(/, +/g, ",").split(",").map(Number);
}

edited Jan 18 '18 at 21:30

answered Apr 21 '15 at 11:35

Ghassen Rjab

683
7
20

Thx RGraham, exactly what I wanted. (my first answer) – Ghassen Rjab Apr 21 '15 at 11:39
3

As according to this answer I ended up doing --> array = (string.length === 0) ? new Array() : string.replace(/, +/g, ",").split(",").map(Number); – Hmahwish Apr 21 '15 at 11:44
much more elegant (y) – Ghassen Rjab Apr 21 '15 at 11:56
1

It looks like you are missing the 'replace': array = string.replace(/, +/g, ",").split(",").map(Number); – Bwyss Jan 18 '18 at 18:10

leopik · Answer 2 · 2015-04-21T11:36:58.677

4

The string.replace(/, +/g, ",").split(",") returns an array with one item - an empty string. In javascript, empty string when converted to number is 0. See yourself

Number(""); // returns (int)0

edited Apr 21 '15 at 11:36

answered Apr 21 '15 at 11:33

leopik

2,323
2
17
29

you forget replace after string same as OP. – jcubic Apr 21 '15 at 11:36
Ya I got that now .Thanks – Hmahwish Apr 21 '15 at 11:45

score 2 · Answer 3 · answered Nov 24 '15 at 14:28

2

To remove the spaces after the comma you can use regular expressions inside the split function itself.

array = string.split(/\s*,\s*/).map(Number);

I hope it will help

answered Nov 24 '15 at 14:28

Beaudinn Greve

810
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17

String with Comma separated numbers to array of integer in javascript

3 Answers3