Remove numbers after decimal in javascript

Question

var randomNumber = (Math.random()*3 + 3.5); randomNumber;

alert(randomNumber)

This piece of code returns a number like

4.589729345235789

I need it to return

4.5

So need it to remove all the numbers after the decimal except the first one, can anyone show me how to do that?

Answer 1

You use Number.prototype.toPrecision() with parameter 2, Number.prototype.toFixed() with parameter 1.

+randomNumber.toPrecision(2);

Alternatively, you can use String.prototype.slice() with parameters 0, 3

+String(randomNumber).slice(0, 3);