How can I convert this into a integer in Javascript?

Question

I asked a similar question yesterday .. If I have for example 0-9999 , how can I turn this into 09999 , basically removing the - and make it an integer in javascript ?

var = 0-9999

turn that into 9999 integer

or var = 2-9999 , turn that into 29999

Thanks a bunch

Do you have it as strings? I mean, var x = "2-9999"? Because var x = 2-9999 is -9997. — bfavaretto
– bfavaretto, Commented Feb 1, 2013 at 20:50

Elliot Bonneville · Accepted Answer · 2013-02-01 20:51:48Z

5

This should do the trick:

num = num.replace(/[^0-9]+/g, '') * 1;

It'll strip out any non-numeric characters and convert the variable into an integer. Here's a jsFiddle demonstration for you.

answered Feb 1, 2013 at 20:51

Elliot Bonneville

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3 Comments

gilly3 Over a year ago

Shorter: num = +num.replace(/\D/g, '')

Elliot Bonneville Over a year ago

@gilly3: Clever. :) I like the +num method, but *1 was the first that came to mind.

Evan Davis Over a year ago

@gilly3 I think you give up too much readability, though I like the shorter regex. It's more obvious IMO what * 1 is doing vs + prefix.

Lloyd · Accepted Answer · 2013-02-01 20:58:04Z

4

The most obvious and basic of solutions would be:

var s = "1-2345";
var t = s.replace("-","");
var i = parseInt(t,10);

But that's making a lot of assumptions and ignoring any errors.

edited Feb 1, 2013 at 20:58

answered Feb 1, 2013 at 20:51

Lloyd

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11 Comments

Lloyd Over a year ago

@ElliotBonneville He's only supplied dashes, but you are right. Like your solution, +1!

Mike Christensen Over a year ago

parseInt will convert 09999 into 0.

Lloyd Over a year ago

@MikeChristensen Really? Not 9999?

Elliot Bonneville Over a year ago

Don't forget your radix. :)

bfavaretto Over a year ago

It depends on the browser, but older ones will assume base 8 and return NaN or 0 for 09999. The safe route is parseInt(t, 10).

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Mike Christensen · Accepted Answer · 2013-02-01 20:58:06Z

1

Try this:

var i = '0-9999';
var int = Number(i.replace('-', ''));
window.alert(int);

Note in Firefox, parseInt() won't work with leading zeros unless you pass in a radix (this appears to be a bug):

var int = parseInt(i.replace('-', ''), 10);

Fiddler

edited Feb 1, 2013 at 20:58

answered Feb 1, 2013 at 20:53

Mike Christensen

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1 Comment

bfavaretto Over a year ago

There is a bug report indeed: bugzilla.mozilla.org/show_bug.cgi?id=510415

JHixson · Accepted Answer · 2013-02-01 21:16:41Z

0

Remember that

var x = 2-9999

is the same as

var x = -9997

because the dash is seen as a subtraction symbol unless you use quotation marks (Single or double, doesn't matter).

So, assuming that you properly quote the text, you can use the following function to always pull out a character that is in any given spot of the text (Using a zero-based index).

function extractChar(myString,locationOfChar){
    var y = myString.substring(0,locationOfChar-1)
    var z = myString.substring(locationOfChar+1)
    var s = y.concat(z)
    var i = parseInt(s,10)
    return i 
}

therefore

var i = extractChar("2-9999",1)

Will be the same as

var i = 29999

edited Feb 1, 2013 at 21:16

answered Feb 1, 2013 at 21:10

JHixson

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