randomInt

/**
 * @example
 * randomInt(0, 10)
 * // => random integer between 0 (inclussive), 10 (exclusive)
 *
 * randomInt(10)
 * // => random integer between 0 (inclussive), 10 (exclusive)
 *
 * randomInt(5,10)
 * // => random integer between 5 (inclussive), 10 (exclusive)
 */
export function randomInt(lower: number, upper?: number) {
  let _lower = 0;
  let _upper = lower;
  if (typeof upper === "number") {
    _lower = lower;
    _upper = upper;
  }
  return Math.trunc(Math.random() * (_upper - _lower)) + _lower;
}

Math.random() returns a random number between 0 (inclusive) and 1 (exclusive). This helper function generates a random integer between a specified range.