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. code example

Math.floor((Math.random() * 100) + 1);
//Generate random numbers between 1 and 100
//Math.random generates [0,1)