Generates an array of unique values given a range

randomNumbers.js

/**
 * Returns a random integer between min and max
 *
 * @export
 * @param  {Number} min: minimum value (inclusive)
 * @param  {Number} max: maximum value (inclusive)
 * @return {Number}
 */
function randomInt(min, max) {
  return Math.floor(Math.random() * (1 + max - min)) + min;
}

/**
 * Generates unique numbers given a range.
 *
 * @private
 * @param  {Number} count: how many numbers will be generated
 * @param  {Number} min: minimum value (inclusive)
 * @param  {Number} max: maximum value (inclusive)
 * @param  {Array} array: the collection of unique numbers generated
 */
function generator(count = 1, min = 1, max = 10, array) {
  let value;
  while (array.length < count) {
    value = randomInt(min, max);
    if (array.indexOf(value) === -1) {
      array.push(value);
    }
  }
}

/**
 * Generates an array of unique numbers given a range.
 *
 * @export
 * @param  {Number} count: how many numbers will be generated
 * @param  {Number} min: minimum positive value (inclusive)
 * @param  {Number} max: maximum positive value (inclusive)
 * @return {Array} the collection of unique numbers generated
 */
function randomNumbers(count, min, max) {
  const uniqueNumbers = [];
  if (count < 0 || min < 0 || max < 0) {
    throw new Error('Parameters must be positive numbers');
  }
  generator(count, min, max, uniqueNumbers);
  return uniqueNumbers;
}

test.js

//generates 7 unique numbers between 60 and 100
var range1 = randomNumbers(7, 60, 100);

//generates 5 unique numbers between 0 and 10
var range2 = randomNumbers(5, 0, 10);

//no arguments
//generates 1 number between 1 and 10
var number = randomNumbers()[0];