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

It seems a random color is desired - one with each component random between 0 and 255.

Math.random() returns a random number on [0,1) (ie it may be exactly zero or up to but not including one).

Multiplying that random value by 256 gives a random number on the range [0,256) (ie it may be 255.99, but never 256). Almost there, but not quite.

Math.floor() rounds the number downwards to the nearest whole integer, making the result an integer on [0,255] as desired.