꼭 알아야할 Array

const items = [
  { name: 'Bike',     price: 100},
  { name: 'TV',       price: 200},
  { name: 'Album',    price: 10},
  { name: 'Book',     price: 5},
  { name: 'Phone',    price: 500},
  { name: 'Computer', price: 1000},
  { name: 'Keyboard', price: 25}
]

const filteredItems = items.filter((item) => {
  return item.price <= 100
})

console.log(filteredItems);

const itemNames = items.map((item) => {
  return item.name
})

console.log(itemNames)

const foundItem = items.find((item) => {
  return item.name === 'Book'
})

console.log(foundItem)

items.forEach((item) => {
  console.log(item.name)
})

// 하나라도
const hasInexpensiveItems = items.some((item) => {
  return item.price <= 100
})

console.log(hasInexpensiveItems)

// 모든것이
const hasExpensiveItems = items.every((item) => {
  return item.price >= 5
})

console.log(hasExpensiveItems)


// 잘 모르겠다 날 잡고 다시 보잣... 
const total = items.reduce((currentTotal, item) => {
  return item.price + currentTotal
}, 0)

console.log(total)