math.random integer javascript code example

Example 1: javascript random number between 0 and 10

Math.floor(Math.random() * 10);

Example 2: random number in js

Math.floor(Math.random() * 5)   // print 0 to 5 && 5 not included

# it will give whole random number upto 5.
# you can add your lastIndex at place of (5).
# Math.floor() function returns the largest integer less than or equal to a given number.