How to convert comma separated string into numeric

Question

I have a one-dimensional array of integer in JavaScript that I'd like to add data from comma separated string, Is there a simple way to do this?

e.g : var strVale = "130,235,342,124 ";

Answer 1

You can use split() to get string array from comma separated string. If you iterate and perform mathematical operation on element of string array then that element will be treated as number by run-time cast but still you have string array. To convert comma separated string int array see the edit.

arr = strVale.split(',');

Live Demo

var strVale = "130,235,342,124";
arr = strVale.split(',');
for(i=0; i < arr.length; i++)
    console.log(arr[i] + " * 2 = " + (arr[i])*2);

Output

130 * 2 = 260
235 * 2 = 470
342 * 2 = 684
124 * 2 = 248

Edit, Comma separated string to int Array In the above example the string are casted to numbers in expression but to get the int array from string array you need to convert it to number.

var strVale = "130,235,342,124";
var strArr = strVale.split(',');
var intArr = [];
for(i=0; i < strArr.length; i++)
   intArr.push(parseInt(strArr[i]));

Answer 2

Solution:

var answerInt = [];
var answerString = "1,2,3,4";
answerString.split(',').forEach(function (item) {
   answerInt.push(parseInt(item))
});

Answer 3

You can split and convert like

 var strVale = "130,235,342,124 ";
 var intValArray=strVale.split(',');
 for(var i=0;i<intValArray.length;i++{
     intValArray[i]=parseInt(intValArray[i]);
}

Now you can use intValArray in you logic.

Answer 4

All of the given answers so far create a possibly unexpected result for a string like ",1,0,-1,, ,,2":

",1,0,-1,,  ,,2".split(",").map(Number).filter(x => !isNaN(x))
// [0, 1, 0, -1, 0, 0, 0, 2]

To solve this, I've come up with the following fix:

",1,0,-1,,  ,,2".split(',').filter(x => x.trim() !== "").map(Number).filter(x => !isNaN(x))
// [1, 0, -1, 2]

Please note that due to

isNaN("") // false!

and

isNaN(" ") // false

we cannot combine both filter steps.

Answer 5

You can use the String split method to get the single numbers as an array of strings. Then convert them to numbers with the unary plus operator, the Number function or parseInt, and add them to your array:

var arr = [1,2,3],
    strVale = "130,235,342,124 ";
var strings = strVale.split(",");
for (var i=0; i<strVale.length; i++)
    arr.push( + strings[i] );

Or, in one step, using Array map to convert them and applying them to one single push:

arr.push.apply(arr, strVale.split(",").map(Number));

Answer 6

? "123,87,65".split(",").map(Number)
> [123, 87, 65]

Edit >>

Thanks to @NickN & @connexo remarks! A filter is applicable if you by eg. want to exclude any non-numeric values:

?", ,0,,6, 45,x78,94c".split(",").filter(x => x.trim().length && !isNaN(x)).map(Number)
> [0, 6, 45]