JS Random

Math.random() returns a random number between 0 (inclusive), and 1 (exclusive).

Math.random()

Math.random() always returns a number lower than 1.

JavaScript Random Integers

Math.random() used with Math.floor() can be used to return random integers.

By multiplying Math.random() with 10, the result is between 0 and 9.9999. Then, Math.floor() rounds it down to the nearest integer.

A Proper Random Function

As you can see from the examples above, it might be a good idea to create a proper random function to use for all random integer purposes.

This JavaScript function always returns a random number between min (included) and max (excluded):