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void MyClass::FetchMagicNumber(std::function<void(int)> callback) {
  std::weak_ptr<MyClass> weak_this = shared_from_this();
  auto fetch_results = [weak_this] {
    auto shared_this = weak_this.lock();
    if (!shared_this) return -1;
    
    return shared_this->requester_->DoLongWebRequest();
  };
  
  system::Runtime::net_io.Post<int>(fetch_results, callback, system::Runtime::ui());

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// Computers represent numbers in binary (base 2), while humans represent them in decimal (base 10).
// In javascript, we can represent a binary number by putting "0b" in front of it

0b011 // evaluates to decimal 3!

// To convert a number from base 2 to base 10, we assign a value to each position
// _ _ _
// 4 2 1

// If the bit at that position is 1, that value is added to the sum. If it's 0, it isn't.

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<canvas id="myCanvas" width="400" height="400"></canvas>

<script>
  var canvas = document.getElementById('myCanvas');
  var context = canvas.getContext('2d');
  
  // use the context to draw!
</script>

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// Event reference: https://developer.mozilla.org/en-US/docs/Web/Events

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// Extended drawing example where we change colors on mouse click.

<canvas id="myCanvas" width="400" height="400"></canvas>

<script>
  var canvas = document.getElementById('myCanvas');
  var context = canvas.getContext('2d');
  
  // array of colors to rotate through on click
  var colors = [

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// Drawing example we used in class.

<canvas id="myCanvas" width="400" height="400"></canvas>

<script>
  var canvas = document.getElementById('myCanvas');
  var context = canvas.getContext('2d');
  context.fillStyle = 'pink';

  canvas.addEventListener('mousemove', function(event) {

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// this implementation preserves the original arr
function flatten(arr) {
  var result = [];
  var queue = [];
  var pointer = 0;

  while(pointer < arr.length) {
    queue.push(arr[pointer]);
    pointer += 1;

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function randomFromStream() {
  var length = 0;
  var result = null;
  var potentialResult;
  
  while(potentialResult = gfs()) {
    length += 1;
    if (Math.floor(Math.random() * length) === 0) {
      result = potentialResult;
    }

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function randomFromStream(currentResult, length) {
  var potentialResult = gfs();

  // no more numbers in stream
  if (potentialResult === null) {
    return currentResult;
  }
  
  length += 1;
  

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var userEmail = $('.user-email').text();
var commonContactsWidget = document.createElement('common-contacts-widget');
commonContactsWidget.setAttribute('user-email', userEmail);
$('.some-area-of-the-page').append(commonContactsWidget);

angular.bootstrap(commonContactsWidget, ['ng', 'commonContactsModule']);