What does Math.floor(Math.random() ); combination do..

Question

I have seen this a lot of times here ..
and I have tried combining

Math.Ceil(Math.random() )
Math.round(Math.random() )
Math.atan(math.abs() )
etc

I don't even know if this is right. .I tried all the Maths() functions and none of them works except the Math.floor(Math.random() )

can anyone try explaining all these maths combining mybe even the rest..

THANK YOU..

Answer 1

Math.floor(Math.random()) will always return 0 as Math.random is a randomly chosen number between 0 and 1, and you're asking for the greatest integer <= your number using Math.floor.
For the same reason, Math.ceil(Math.random()) will always return 1 because Math.ceil gives you the lowest integer >= your number.
However, Math.round(Math.random()) will give you 0 half of the time, and 1 the rest.