gleendo

function func() {
  var arr = [];

  for (var i = 0; i < 3; i++) {
    var tmp = (function(i) {
      return function() {
        console.log(i);
      };
    })(i);

    arr.push(tmp);
  }

  return arr;
}

var arr = func();

arr[0]();
arr[1]();
arr[2]();

let letFunc = () => {
	let arr = [];
  
  for (let i = 0; i < 3; i++) {
  	arr.push(() => console.log(i));
  }
  
  return arr;
}

let letArr = letFunc();

letArr[0]();
letArr[1]();
letArr[2]();

var mylist = ["first", "second", "thrid", "fourth", "fifth"];

for (var i = 0; i < mylist.length; i++) {
  var button = document.createElement("button");
  button.className = mylist[i];
  button.textContent = mylist[i];

  document.querySelector(".button-list").appendChild(button);
}

var scrollHeight = Math.max(
  document.body.scrollHeight, document.documentElement.scrollHeight,
  document.body.offsetHeight, document.documentElement.offsetHeight,
  document.body.clientHeight, document.documentElement.clientHeight
);

document.querySelectorAll(".pf").forEach(elem => elem.style.display = "none");

var cleanUpArray = function () {
    particles = particles.filter(function(p) {
    	return (p.x > -100 && p.y > -100);
    });
};