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// jshint esversion: 6

//define event handler
let main = function() {
  //dispatch on button id

  if (this.id == "btn1") {
    //handle button 1 here
  }
};

//register event handler
window.addEventListener("load", function() {
  let buttons = document.querySelectorAll("button");
  for (var i = 0; i < buttons.length; ++i)
    //when the button gets clicked, who ya gonna call?
    buttons[i].addEventListener("click", main);
});