Question

I’d like to display decimal places intelligently (i.e. without having to choose between lengthy decimal places or a ton of trailing zeroes) in JavaScript. This is my original list:

6
8
12.225252

Currently I’m using toFixed(1), and have output like this:

6.0
8.0
12.2

Is there a way I can get:

6
8
12.2

instead? Obviously I can write some custom code to do this, but is there anything in-built in JavaScript?

Answer 1

You can use Math.round.

function roundTo(n, decimals) {
    var d = Math.pow(10, decimals);
    return Math.round(n * d)/d;
}

Examples:

roundTo(6, 1)
6
roundTo(8, 1)
8
roundTo(12.623456, 1)
12.6