map.js

'use strict'
let groceryList = new Map()
groceryList.set('Bananas', 6)
groceryList.set('Apples', 12)
groceryList.set('Grapes', 2)
groceryList.set('Kiwis', 10)
groceryList.set('Pears', 8)

console.log(groceryList.get('Kiwis') === 10)
console.log(groceryList.size === 5)

for (let [ key, val ] of groceryList.entries())
  console.log(`${key} = ${val}`)

groceryList.delete('Apples')
console.log(groceryList.size === 4)

console.log(...groceryList.values())
console.log(...groceryList.keys())

groceryList.clear()
console.log(groceryList.size === 0)