Snippet: Generate a number with JavaScript Math.random()

The Math.random() method which generates random number in JavaScript can be considered as unreliable. It returns only a number that’s greater than or equal to 0 and less than 1. In most cases that’s not what developer wants.

Here are two functions that uses Math.random() which helps to generate random numbers in more controllable way.

Random numbers in range (including max and min)

function randomNumber(min: number, max: number) {
  return Math.floor(Math.random() * (max - min + 1)) + min;
}

Random numbers in range (min included, max excluded)

function randomNumber(min: number, max: number) {
  return Math.random() * (max - min) + min;
}