three different ways of writing the same thing

gistfile1.js

function fn() {
  var args = Array.prototype.slice.call(arguments);
  var node;
  var i = 0;
  while(node = args.shift()) {
    if(typeof node == 'function') {
      node();
      console.log("Function found at index %d", i);
      break;

    }
    ++i;
  }
}

function fn1() {

  for(var i = 0, args = Array.prototype.slice.call(arguments); i < args.length; ++i) {

    if(typeof args[i] == 'function') {
      args[i]();
      console.log("Function found at index %d", i);
    }
  }
};

function fn2() {
  for(var i = 0; i < arguments.length; i++) {
    if('function' == typeof arguments[i]) {
      arguments[i]();
      console.log("Function found at index %d", i);
    }
  }
}