javascript - How to convert a string of numbers to an array of numbers?

Question

I have below string -

var a = "1,2,3,4";

when I do -

var b = a.split(',');

I get b as ["1", "2", "3", "4"]

can I do something to get b as [1, 2, 3, 4] ?

Answer 1

You can use Array.map to convert each element into a number.

var a = "1,2,3,4";

var b = a.split(',').map(function(item) {
    return parseInt(item, 10);
});

Check the Docs

---

Or more elegantly as pointed out by User: thg435

var b = a.split(',').map(Number);

Where Number() would do the rest:check here

---

Note: For older browsers that don't support map, you can add an implementation yourself like:

Array.prototype.map = Array.prototype.map || function(_x) {
    for(var o=[], i=0; i<this.length; i++) { 
        o[i] = _x(this[i]); 
    }
    return o;
};