Today we are going to build the game memory.

• an array of ten tiles
  • your ten 'tiles' will represent the letter values that will be displayed on each DOM tile. eg. ['A', 'A', 'B', 'B', etc.]

• window.onload()
  • write the Javascript that will select the Start Game button element from the DOM
  • assign the button DOM object to a variable
  • attach a click event listener to the variable
  • Inside that function, add a console.log('started'); and invoke the start() function
• start()
  • shuffle the tiles array
  • then call makeAndDisplayTiles to build and display the gameboard
• makeAndDisplayTiles()
  • this function should empty the container that will hold the gameboard tiles
  • it should clear the text in the info div
  • it should create 10 new game tiles (divs)
    • give them the class 'column'
    • give them a 'data-value' attribute from each element of your tiles array. The output for an 'A' tile will look like <div class="column" data-value="A"></div>
    • add the game tiles to the board
    • should add click events to each of the gameboard tiles
    • Each click event should call the game object's makePlay function passing it the tile that was clicked. Strong hint: the tile that was clicked is this tile . . .
• makePlay(tile)
  • this function should set the text of the current clicked tile to the value stored in the data attribute
  • it should add a class of clicked to the tile
  • if the number of clicked tiles is 2, then it should check for a match
• checkForMatch()
  • the entire contents in this function should be inside a setTimeout()
  • this should retrieve the data-value of the two clicked tiles
  • if they are a match
    • the 'clicked' class should be removed from the tiles
    • the 'found' class should be added
    • hint: the class value of the matching tiles should be 'column found'
  • if no match is found
    • the text of the clicked cards should be set back to empty
    • the found and clicked classes should both be removed
  • should check for a win
• checkForWin()
  • if the number of found tiles is 10
    • remove the found class
    • add a won class
    • add a winning message to the info div

• add a timer
• user can select the speed of the setTimeout()
• add a click counter
• the click event should be turned off for matched tiles