01.js

/**
 * @func add
 * @desc Addition entre l'argument a et b
 * @param {!Number} a
 * @param {!Number} b
 * @returns {Number}
 *
 * @throws {TypeError}
 */
export function add(a, b = 10) {
  if (typeof a !== "number") {
    throw new TypeError("a must be a number");
  }
  if (typeof b !== "number") {
    throw new TypeError("b must be a number");
  }

  return a + b;
}

/**
 * @func calc_moy
 * @desc Calcule d'une moyenne à partir d'un tableau de nombre
 * @param {!Number[]} nums
 * @returns {Number}
 *
 * @throws {TypeError}
 */
export function calc_moy(nums = []) {
  if (!Array.isArray(nums)) {
    throw new TypeError("nums must be an array!");
  }

  return nums.reduce((acc, curr) => curr + acc, 0) / nums.length;
}