index.js

const ary = [];
const q = new Proxy(ary, {
    get: (target, name) => {
    console.log(`(get) target : ${JSON.stringify(target)}, name: ${name}`);
    return target[name];
  },
    set: (target, name, value) => {
    console.log(`(set) target : ${JSON.stringify(target)}, name: ${name}`);
    target[name] = value;
  }
});

q.push('a');
q.push('b');
q.push('c');

console.log(q[0]);