Using Math. floor and Math. random to obtain random Integers

This article describes how to use Math. floor and Math. random to obtain random integers. For more information, see Math. random (): Get 0 ~ 1 random number

Math. floor () method rounds a number DOWNWARDS to the nearest integer, and returns the result. (the nearest integer to x is smaller than or equal to x .)
In fact, the returned value is the integer:
Math. floor (0.666) --> 0
Math. floor (39.2783) --> 39

So we can use Math. floor (Math. random () to obtain an integer in the range you want.
For example, from 1 ~ Take a random number within 52:
First Math. random () * 52 // so that we can get a number with a value greater than or equal to 0 and less than 52.
Then add 1: Math. random () * 52 + 1 // now the number is greater than or equal to 1 and <53
Then use Math. floor to get the integer

Final: Math. floor (Math. random () * 52 + 1)

The value range is 1 ~ The random integer of 52.