Proxy I

Question

What does the code snippet to the right output by console.log?

Snippet

const obj = new Map()
const map = new Map()
obj.foo = 1
map.set('foo', 2)
console.log(obj.foo)
console.log(map.get('foo'))

const proxyObj = new Proxy(obj, {})
const proxyMap = new Proxy(map, {})
console.log(proxyObj.foo)
console.log(proxyMap.get('foo'))

Source

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