Javascript Math Rounding

Question

Possible Duplicate:
Is JavaScript's Math broken?

Okay, I have this script:

var x = new Date;
setInterval(function() {
    $("#s").text((new Date - x) / 60000 + "Minutes Wasted");
}, 30000);

It works perfectly fine. Except it sometimes gives me an answer like 4.000016666666666. How can I round that? If I have to rewrite the script, that is okay. Thanks!

Did you even try the search feature ? There are plenty of duplicates. — Alexandre C., Feb 15 '11 at 15:04
possible duplicate of [Is JavaScript's Math broken?](http://stackoverflow.com/questions/588004/is-javascripts-math-broken) - many, many others. — Andy E, Feb 15 '11 at 15:05
Ehm, how about trying http://www.google.com/search?q=javascript+round? — Jakub Hampl, Feb 15 '11 at 15:08
I've searched. I get some weird piece of code that I have to somehow put into my script. — 0x60, Feb 15 '11 at 15:09

score 14 · Answer 1 · answered Feb 15 '11 at 15:08

You can use Math.floor() function to 'round down'

$("#s").text(Math.floor((new Date - x) / 60000 + "Minutes Wasted"));

or Math.ceil(), which 'round up'

$("#s").text(Math.ceil((new Date - x) / 60000 + "Minutes Wasted"));

or Math.round(), which round either up or down, where it's closer to:

$("#s").text(Math.round((new Date - x) / 60000 + "Minutes Wasted"));

Albireo · Answer 2 · 2011-02-15T15:14:23.033

2

Math.round?

See http://www.w3schools.com/jsref/jsref_obj_math.asp

edited Feb 15 '11 at 15:14

answered Feb 15 '11 at 15:05

Albireo

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`Math.Round` _(sic)_ is not going to work; `Round` is not a constructor so doesn't start with a capital R. – Martijn Feb 15 '11 at 15:13

score 0 · Answer 3 · answered Feb 15 '11 at 15:05

0

setInterval(function() {
    $("#s").text(parseInt((new Date - x) / 60000) + "Minutes Wasted");
}, 30000);

use parseInt().

answered Feb 15 '11 at 15:05

powtac

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score 0 · Answer 4 · answered Feb 15 '11 at 15:05

0

If you're looking for simple Math round then here it is Math.round(40.45);

answered Feb 15 '11 at 15:05

Umair A.

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Javascript Math Rounding

4 Answers4