Quantize value to a multiple

quantize.js

  /**
   * Return a number "rounded" to the nearest multiple of `amount`.
   *
   * @param {number} num - The number to quantize
   * @param {number} amount - the quantization factor
   * @return {number} The multiple of `amount` that is nearest to `number`.
   */
  quantize(num, amount) {
    const halfway = Math.round(amount / 2);

    if (amount == 1) {
      return Math.round(amount);
    }

    return num - (num % amount) + halfway;
  }