How to Convert a String with Commas into a JavaScript Array of Numbers?

How to Convert a String with Commas into a JavaScript Array

The code:

var string = "0,1";
var array = [string];
alert(array[0]);

shows a problem when trying to convert a string with commas into a JavaScript array. The alert shows "0,1" instead of "0" as desired.

To resolve this, you can use JSON.parse to convert the string into an array of numbers:

var array = JSON.parse("[" + string + "]");

This will give you the expected result:

[0, 1]

Note that using .split() will result in an array of strings:

["0", "1"]

JSON.parse has limitations regarding supported data types. If you need to work with undefined values or functions, you may need to consider using eval() or a JavaScript parser.

For more flexibility, you can also use .split() with Array.prototype.map to convert the strings to numbers:

var array = string.split(",").map(Number);

This will again give you the desired result:

[0, 1]

Keep in mind that this approach requires a shim for IE8 and lower versions, or you can use a traditional loop instead of Array.prototype.map.

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