2.7 Generating Pseudorandom Numbers
NN 2, IE 3
var result = Math.floor(Math.random( ) * (n + 1);
where n is the highest acceptable integer of the range. To calculate a pseudorandom integer number within a range starting at a number other than zero, use the formula:
var result = Math.floor(Math.random( ) * (n - m + 1)) + m;
where m is the lowest acceptable integer of the range, and n is the highest acceptable integer of the range.
The previous examples focus on random integers, such as the kind you might use for values of a game cube (a die with numbers from 1 through 6). But you can remove the Math.floor( ) call to let the rest of the expression create random numbers with decimal fractions if you need them.
2.7.4 See Also
Section 2.0.2 in the introduction of this chapter.