What is the output of the following? “`js const handler = { get(target, key) { return key in target ? target[key] : 37; } }; const p = new Proxy({a: 1}, handler); console.log(p.a, p.b); “`

Question

JavaScript Developer — Hard

What is the output of the following? “`js const handler = { get(target, key) { return key in target ? target[key] : 37; } }; const p = new Proxy({a: 1}, handler); console.log(p.a, p.b); “`

Accepted Answer

The output is 1, 37 because the Proxy handler returns the value of the property if it exists in the target object, otherwise it returns 37. In this case, `p.a` exists in the target object, so it returns 1, while `p.b` does not exist, so it returns 37.