JAVASCRIPT

js number 2 decimal places

(3.141596).toFixed(2);	// 3.14

js number with four decimal places

var myNumber = 2;

myNumber.toFixed(2); //returns "2.00"
myNumber.toFixed(1); //returns "2.0"

set to 2 decimals javascript

(<number>).toFixed(<Number of decimal places required>);

add decimals javascript

Use toFixed to convert it to a string with some decimal places shaved off, and then convert it back to a number.

+(0.1 + 0.2).toFixed(12) // 0.3

It looks like IE's toFixed has some weird behavior, so if you need to support IE something like this might be better:

Math.round((0.1 + 0.2) * 1e12) / 1e12

javascript no decimal places

const removedDecimal = Math.round(decimal);
// returns 5

to 2 decimal places javascript

var discount = Math.round((100 - (price / listprice) * 100) * 100) / 100;

javascript no decimal places

const removedDecimal = Math.trunc(decimal);
// returns 5