4주차 멘토링

const isDateBefore = !aDate.isBefore(plan.summerStart) && !aDate.isAfter(plan.summerEnd)
if (!aDate.isBefore(plan.summerStart) && !aDate.isAfter(plan.summerEnd))
  charge = quantity * plan.summerRate;
else
  charge = quantity * plan.regularRate + plan.regularServiceCharge;

if (summer())
  charge = summerCharge();
else
  charge = regularCharge();

let youngest = people[0] ? people[0].age : Infinity;
let totalSalary = 0;

for (const p of people) {
  if (p.age < youngest) youngest = p.age;
  totalSalary += p.salary;
}

return `최연소: ${youngest}, 총 급여 : ${totalSalary}`;

function totalSalary() {
  return people.reduce((total, p) => total + p.salary, 0);
}
function youngestAge() {
  return Math.min(...people.map((p) => p.age));
}

class Order {
  constructor(quantity, item) {
    this._quantity = quantity;
    this._item = item;
  }

  get price() {
    const basePrice = this.quantity * this._item.price;
    let discountFactor = 0.98;

    if (basePrice > 1000) {
      discountFactor -= 0.03;
    }
    return basePrice * discountFactor;
  }
}

class Order {
  constructor(quantity, item) {
    this._quantity = quantity;
    this._item = item;
  }

  get price() {
    return this.basePrice * this.discountFactor;
  }

  get basePrice() {
    return this.quantity * this._item.price;
  }

  get discountFactor() {
    let discountFactor = 0.98;
    if (this.basePrice > 1000) {
      discountFactor -= 0.03;
    }

    return discountFactor;
  }
}