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

~~Number is only the Math.floor() for positive numbers. For negative numbers, it is the Math.ceil().

For positive numbers you can use:

Math.floor(x) == ~~(x)

Math.round(x) == ~~(x + 0.5)

Math.ceil(x) == ~~(x + 1)

For negative numbers you can use:

Math.ceil(x) == ~~(x)

Math.round(x) == ~~(x - 0.5)

Math.floor(x) == ~~(x - 1)