# How to change the sign of a number in JS

There comes a situation where we need to change a number's sign (+/-). We can do this in two ways:

`Math.abs()`

`abs`

gives the absolute number irrespective of a number's sign.

js

const randomDiff = Math.abs(Math.random() - Math.random())console.log(randomDiff)

`Math.sign`

On the other hand, `sign`

returns the sign of a number as either `-1`

or `1`

or `0`

if the number is `0`

.

js

const randomNumber = Math.random() - Math.random()const randomDiff = Math.sign(randomNumber) * randomNumberconsole.log(randomDiff)