Explain Math.floor(Math.random())

Question

I have seen many places using Math.floor() and Math.random()

like below

$(\'a.random-color\').hover(function() { //mouseove         


        

Answer 1

The Math.floor() is to drop the decimal portion of the Number. It is the opposite of Math.ceil().

You can also double the invert bitwise operator (~~) to achieve the same as Math.floor() (though of course the floor() method is much more readable to most).

~~(Math.random() * 256)