Reflect.get()

Reflect.get(target, propertyKey)
Reflect.get(target, propertyKey, receiver)

// Object
let obj = { x: 1, y: 2 }
Reflect.get(obj, 'x')  // 1

// Array
Reflect.get(['zero', 'one'], 1)  // "one"

// Proxy with a get handler
let x = {p: 1};

let obj = new Proxy(x, {
  get(t, k, r) {
    return k + 'bar'
  }
})
Reflect.get(obj, 'foo')  // "foobar"

//Proxy with get handler and receiver
let x = {p: 1, foo: 2};
let y = {foo: 3};

let obj = new Proxy(x, {
  get(t, prop, receiver) {
    return receiver[prop] + 'bar'
  }
})
Reflect.get(obj, 'foo', y) // "3bar"