JS Practice — Built-in Objects

Proxy set trap — double value on write

📖 Usage Example

const log = []
const p = new Proxy({}, {
  set: (t, k, v) => { log.push(String(k) + '=' + v); t[k] = v; return true }
})
p.x = 10
console.log(log) // → ["x=10"]

The set trap intercepts property assignments on a proxy, letting you validate or observe writes before they reach the target.

set trap — transform written values

Use the set trap to store a transformed version of the value.

Challenge: Verify that after p.n = 5, reading p.n returns 10 (value doubled).

💡 Hints (1)

• Store `v * 2` in `target[key]` inside the `set` trap.