Dirty Javascript reproduction of https://twitter.com/jplur_/status/891358168688754688

playground-tweet.js

// Dirty overload the native function
var parseInt = function(arg1) {
  if (arg1 === "Infinity") {
    return NaN;
  }
  if (arg1 === "Infinity+1") {
    return "Infinity1";
  }
  if (arg1 === "1+1+1") {
    return "3?";
  }
  if (arg1 === "") {
    return "stop it";
  }
  if (arg1 === parseInt) {
    console.error("Getting really tired of your bullshit");
  }
}

// Then do the magic like at https://twitter.com/jplur_/status/891358168688754688
parseInt("Infinity") // NaN

parseInt("Infinity+1") // "Infinity+1"

parseInt("1+1+1") // 3?

parseInt([]+[]+[]) // "stop it"

parseInt(parseInt) // "Getting real tired of your bullshit.."

Funny now you can driver to crazy a coworker overwritten built-in methods