Need present whole number with 2 decimals (5.00) in javascript

Question

I have this

Math.round((Math.abs(21600 / 3600))*100)/100
>> 6 # want 6.00
Math.round((Math.abs(21000 / 3600))*100)/100
>> 5.83 # This is right

I need 2 decimals on whole number.

possible duplicate of [Format number to always show 2 decimal places](http://stackoverflow.com/questions/6134039/format-number-to-always-show-2-decimal-places) — Curtis, Apr 30 '13 at 11:13
Alnitak's answer makes this a good conversation. His answer also cleans up the code considerably! — Andreas Lyngstad, Apr 30 '13 at 11:32

score 7 · Accepted Answer · answered Apr 30 '13 at 11:00

7

You can use .toFixed(), but there's no need to manually round the value to the nearest 0.01 first - the .toFixed function will do that for you.

var str = Math.abs(21600 / 3600).toFixed(2);

answered Apr 30 '13 at 11:00

Alnitak

all votes gratefully accepted - I'm trying to hit 100k rep today ;-) – Alnitak Apr 30 '13 at 11:05
1

toFixed() won't result in a number, but rather a string – Confused May 26 '16 at 13:44
@Confused indeed, and that's why my variable is named `str`. Rounding floating point numbers is invariably a _presentation_ problem, not a math one. – Alnitak May 26 '16 at 13:46
I've been struggling with this exact topic all day. Maybe it's just my ocd but I can't stand that it's so hard to maintain a #.0 in js! – Confused May 26 '16 at 13:48

score 2 · Answer 2 · answered Apr 30 '13 at 10:57

2

(Math.round((Math.abs(21600 / 3600))*100)/100).toFixed( 2 );

answered Apr 30 '13 at 10:57

jAndy

This is overkill - `(21600/3600).toFixed(2)` is sufficient – Dennis Apr 30 '13 at 11:01
@Dennis true, however its totally irrelevant for the question. – jAndy Apr 30 '13 at 11:06
1

It's totally relevant. OP was trying to multiply/round/divide to trim the number - `toFixed` handles this so it's unnecessary. – Dennis Apr 30 '13 at 11:25
@Dennis http://beta.bucketlamp.com/upload/2009/09/16/1253083798_display_1253083798cat_watermelon.jpg – jAndy Apr 30 '13 at 11:34

score 1 · Answer 3 · answered Apr 30 '13 at 10:57

1

Try this:

(Math.round((Math.abs(21600 / 3600))*100)/100).toFixed(2)

answered Apr 30 '13 at 10:57

robertklep

Dor Cohen · Answer 4 · 2013-04-30T12:34:11.377

1

You can use toFixed() method:

var num = num.toFixed(6);

Now num wil be equal to 6.00

edited Apr 30 '13 at 12:34

answered Apr 30 '13 at 10:57

Dor Cohen

1

what does that DOM stuff add to this answer? The OP might not even be using a browser. – Alnitak Apr 30 '13 at 11:04

4 Answers4