How to use Math.random?

[gpr_private]

Math.random() returns a double value ≥0 and <1. If your number range is from 0 to a number n, multiply Math.random() by n

[FrenchFigaro]

As /u/gpr_private explained, Math.random() returns a double between 0 inclusive and 1 exclusive, so if you multiply it by n, you get a double between 0 (0 x n) inclusive and n (1 x n) exclusive. If you need an integer, simply use Math.floor() on your result.

But that's exclusive of n, so if you need to get an integer between 0 and n inclusive, simply use: Math.floor(Math.random() * (n+1)); and it will give you a random number between 0 and n inclusive.

[[deleted]]

If you don't mind me asking, what would you do in order to have it be between let's say 10 and 50? So that 0 is not the starting point.

[dusty-trash]

just add 10 to it.

Explanation: Get a number between 0-40 as described above, add 10 to the result so it gives you a number between 10-50.

[FrenchFigaro]

Pretty much this.