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
– Hmahwish, Commented Apr 21, 2015 at 11:39
related: How to convert comma separated string into numeric array in javascript — Bergi
– Bergi, Commented Jun 22, 2022 at 20:19

Ghassen Rjab · Accepted Answer · 2018-01-18 21:30:47Z

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, 2018 at 21:30

answered Apr 21, 2015 at 11:35

Ghassen Rjab

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4 Comments

Ghassen Rjab Over a year ago

Thx RGraham, exactly what I wanted. (my first answer)

Hmahwish Over a year ago

As according to this answer I ended up doing --> array = (string.length === 0) ? new Array() : string.replace(/, +/g, ",").split(",").map(Number);

Ghassen Rjab Over a year ago

much more elegant (y)

Bwyss Over a year ago

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

leopik · Accepted Answer · 2015-04-21 11:36:58Z

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, 2015 at 11:36

answered Apr 21, 2015 at 11:33

leopik

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2 Comments

jcubic Over a year ago

you forget replace after string same as OP.

Hmahwish Over a year ago

Ya I got that now .Thanks

Beaudinn Greve · Accepted Answer · 2015-11-24 14:28:08Z

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, 2015 at 14:28

Beaudinn Greve

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