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JavaScript: Create random numbers

Tip by NetLabel | Last update on 2020-02-05 | Created on 2012-05-23

With this tiny function, you get a random number in JavaScript:

function RandomNumber(upperLimit) {
   return Math.floor(Math.random()*upperLimit);
// Example of a call
var x = RandomNumber(11);
alert(x); // Number between 0 and 10

We call the function RandomNumber() with a parameter, that indicates the upper limit of the generated numbers. The function then produces numbers from 0 to a value less than the upper limit.

Therefore, if we call the function with RandomNumber(3), the function will give us one of the numbers 0, 1 or 2.


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