JS Practice — Built-in Objects

Proxy get trap — double value

📖 Usage Example

const p = new Proxy({}, {
  get: (target, key) => 'got ' + String(key)
})
console.log(p.foo) // → 'got foo'
console.log(p.bar) // → 'got bar'

The get trap intercepts property reads on a proxy, letting you return custom values for any key instead of actual target values.

get trap — transform target values

The get trap can access the real target and transform its values.

Challenge: Verify that a proxy doubling target[key] returns 2 for a target {a: 1}.

💡 Hints (1)