// ref
var obj = {
	a: 'a',
	b: 'b'
}

function do(arg) {
	arg.a = 'c';
}

do(obj);
console.log(obj);

// 1
var outer = true;

function outerFunction() {
  console.log('outer is', outer);
  console.log('beforeCall is', beforeCall);
  console.log('afterCall is', afterCall);
}

var beforeCall = true;
outerFunction();
var afterCall = true;

// 2
var outer = true;
var later;

function outerFunction() {
  var inner = true;

  function innerFunction() {
    console.log('outer is', outer);
    console.log('inner is', inner);
  }

  later = innerFunction;
}

outerFunction();
later();

// 3
var outer = true;
var later;

function outerFunction() {
  var inner = true;

  function innerFunction(param) {
    console.log('outer is', outer);
    console.log('inner is', inner);
    console.log('param is', param);
    console.log('too late is', tooLate);
  }

  later = innerFunction;
}

console.log('too late is', tooLate);

var tooLate = true

outerFunction();
later('defined');

// 4
function a() {
  var i = '';

  function b() {
	i += 'a';
	  return i;
  }
  return b;
}

var c = a();
c();
c();

// 5
var links = document.querySelectorAll('a');

for (var i = 0; i < links.length; i++) {
    links[i].addEventListener('click', function(e) {
		e.preventDefault();
        console.log(i);
    })
}