How to format a float in javascript?

Question

How can i get just 2 digits after comma in javascript? For example, 0.34 instead of 0.3445434.

Answer 1

var result = Math.round(original*100)/100;

The specifics, in case the code isn't self-explanatory.

edit: ...or just use toFixed, as proposed by Tim Büthe. Forgot that one, thanks (and an upvote) for reminder :)

Answer 2

var x = 0.3445434
x = Math.round (x*100) / 100 // this will make nice rounding

Answer 3

There are functions to round numbers. For example:

var x = 5.0364342423;
print(x.toFixed(2));

will print 5.04.

Answer 4

Be careful when using toFixed():

First, rounding the number is done using the binary representation of the number, which might lead to unexpected behaviour. For example

(0.595).toFixed(2) === '0.59'

instead of '0.6'.

Second, there's an IE bug with toFixed(). In IE (at least up to version 7, didn't check IE8), the following holds true:

(0.9).toFixed(0) === '0'

It might be a good idea to follow kkyy's suggestion or to use a custom toFixed() function, eg

function toFixed(value, precision) {
    var power = Math.pow(10, precision || 0);
    return String(Math.round(value * power) / power);
}