Metaprogramming in JavaScript using proxy and with statement

metaprogramming-with-proxy.js

/*
  This code snippet demonstrates how to do metaprogramming
  in JavaScript using proxy and with statement.
  Run this in non-strict mode.
 */
const proxy = new Proxy({}, {
  get(target, key) {
    if(key === Symbol.unscopables) return {}
    return `${key.toUpperCase()} `
  },

  has(target, key) {
    return true
  }
})

const main = () => {
  with (proxy) {
    return This + is + Black + Magic
  }
}

console.log(main())

I tried doing this a while back but did not realize you had to check unscopables. Nice!

I'm tempted to press the "Report abuse" link for what you've done to JavaScript. Great work!