javascript split string of ints to array

Question

I have a string MyString like this:

var MyString = "32,43,545,34,23,";

I'd like to have this in an array of ints.

If I do this:

var MyArray = MyString.split(",");

I get an array of strings. How do I get an array of ints?

I know I can loop over the array and do a parseInt on each element but I was wondering if there's a better way to do it.

Thanks.

If you're setting the contents why can't you make them an array initially? — Rick
– Rick, Commented Apr 12, 2012 at 13:12

frenchie · Accepted Answer · 2012-04-12 13:25:06Z

7

unfortunatelly you'll have to manually walk through the array and change each element like this:

var MyArray = MyString.split(",");
for (var i=0, LoopTimes = MyArray.length; i < LoopTimes; i++){
    MyArray[i] = parseInt(MyArray[i], 10);
}

or you can also have a look at this: http://phpjs.org/functions/array_walk:349

edited Apr 12, 2012 at 13:25

frenchie

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answered Apr 12, 2012 at 13:11

Gavriel

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3 Comments

Michael Berkowski Over a year ago

Don't forget the radix to parseInt() It's optional, but really it isn't. parseInt(MyArray[i], 10)

frenchie Over a year ago

Ok, that's what I thought of doing too. Oh well, no big biggie anyway.

frenchie Over a year ago

I edited your answer to cache the length of the array and speed up the loop a bit. Thanks for your answer; I prefer cross-browser compatibility to something terser that works only in most browsers.

katspaugh · Accepted Answer · 2012-04-12 13:12:42Z

7

'32,43,545,34,23'.split(',').map(Number)

answered Apr 12, 2012 at 13:12

katspaugh

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5 Comments

Rick Over a year ago

I like it too, but it doesn't look like it's supported until in IE until 9. developer.mozilla.org/en/JavaScript/Reference/Global_Objects/…

Linus Thiel Over a year ago

For browsers not supporting ES5, you can use the excellent es5-shim.

Rick Over a year ago

"As closely as possible to ES5" is not very close. Many of these shims are intended only to allow code to be written to ES5 without causing run-time errors in older engines. In many cases, this means that these shims cause many ES5 methods to silently fail. Decide carefully whether this is what you want... Ouch... api.jquery.com/jQuery.map maybe?

user1106925 Over a year ago

@Rick: Wait... If that statement from es5-shim is enough to dissuade someone, then how would jQuery be an improvement? $.map doesn't even try to be ES5 compatible.

Rick Over a year ago

Well, I pasted that comment from the readme and it seems I may have skimmed it too fast. For some reason I mistook fail silently for 'failing silently and not doing anything at all' instead of 'fail silently but go ahead and do what you expect to happen with this other function' I suppose it could actually be a decent library.

qw3n · Accepted Answer · 2012-04-12 13:20:13Z

0

This should work in most cases as well, and it is slightly faster than the parseInt method I believe.

for(var i=0;i<MyArray.length,i++){
  MyArray[i]=MyArray[i]-0;
}

answered Apr 12, 2012 at 13:20

qw3n

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