JS Practice — Built-in Objects

Proxy deleteProperty trap — log deleted key

📖 Usage Example

const log = []
const p = new Proxy({}, {
  deleteProperty: (t, k) => { log.push(k); return true }
})
delete p.foo
console.log(log) // → ['foo']

The deleteProperty trap intercepts delete operations, allowing custom logic when a property is deleted from a proxy.

Proxy deleteProperty trap

The deleteProperty trap intercepts the delete operator. Use it to observe or prevent deletions.

Challenge: Verify that delete p.x pushes 'x' into a deleted array.

💡 Hints (1)

• The `deleteProperty(target, key)` trap is called when `delete proxy.key` is executed.