Get random integer in a range using JavaScript

Similarly to generating a random float number within the specific range, you can write a function to get a random integer with a range.

function getRandomIntegerInRange(min, max) {
  return Math.floor(Math.random() * (Math.floor(max) - Math.ceil(min)) + min;
}

The function getRandomIntegerInRange returns a random number between min (inclusive) and max (exclusive).

If you want both min and max to appear as possible random return value, you should modify the function a bit by adding in a +1.

function getRandomIntegerInRangeIncludingMax(min, max) {
  return Math.floor(Math.random() * (Math.floor(max) - Math.ceil(min) + 1) + min;
}

Now the function getRandomIntegerInRangeIncludingMax will return the random integer in a specific range and the max value will sometimes appear as a return result.