This commit is contained in:
jim-clark 2019-07-26 15:29:11 -07:00
parent db44e80cb7
commit e2b5173957
3 changed files with 49 additions and 2 deletions

View file

@ -3,6 +3,7 @@
}
body {
font-family: Montserrat;
height: 100vh;
margin: 0;
display: flex;

View file

@ -5,6 +5,7 @@
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Connect Four</title>
<link href="https://fonts.googleapis.com/css?family=Montserrat" rel="stylesheet">
<link rel="stylesheet" href="css/main.css">
<script defer src="js/main.js"></script>
</head>

View file

@ -53,9 +53,13 @@ function render() {
});
// Render the message
if (winner) {
if (winner === 'T') {
msgEl.textContent = "It's a Tie!";
} else {
msgEl.innerHTML = `<span style="color:${COLORS[winner]}">${COLORS[winner].toUpperCase()}</span> Wins!`;
}
} else {
msgEl.textContent = `${COLORS[turn].toUpperCase()}'s Turn`;
msgEl.innerHTML = `<span style="color:${COLORS[turn]}">${COLORS[turn].toUpperCase()}</span>'s Turn`;
}
}
@ -84,4 +88,45 @@ function handleClick(evt) {
function getWinner() {
// return the winner, 'T' or null
let winner = null;
// using a for loop because we want to stop looping if we find a winner
for (let colIdx = 0; colIdx < board.length; colIdx++) {
// check if any cells in the col lead to a winner
winner = checkCol(colIdx);
// done if winner is found, no reason to keep looking
if (winner) break;
}
return winner;
}
function checkCol(colIdx) {
let winner = null;
for (let rowIdx = 0; rowIdx < board[colIdx].length; rowIdx++) {
// using the logical OR operator (||) prevents the checks to the right
// from ever running if a winner is found. For example, if checkUp returns
// a truthy value, checkRight and the checkDiag will never be called
winner = checkUp(colIdx, rowIdx) || checkRight(colIdx, rowIdx) || checkDiag(colIdx, rowIdx, 1) || checkDiag(colIdx, rowIdx, -1);
if (winner) break;
}
return winner;
}
function checkUp(colIdx, rowIdx) {
// boundary check (can't check up if rowIdx is greater than 2)
if (rowIdx > 2) return null;
const colArr = board[colIdx];
// ternary expression deluxe!
return ( Math.abs(colArr[rowIdx] + colArr[rowIdx + 1] + colArr[rowIdx + 2] + colArr[rowIdx + 3]) === 4 ) ? colArr[rowIdx] : null;
}
function checkRight(colIdx, rowIdx) {
if (colIdx > 3) return null;
return ( Math.abs(board[colIdx][rowIdx] + board[colIdx + 1][rowIdx] + board[colIdx + 2][rowIdx] + board[colIdx + 3][rowIdx]) === 4 ) ? board[colIdx][rowIdx] : null;
}
// Notice the extra vertOffset parameter for determining whether checking up or down vertically
function checkDiag(colIdx, rowIdx, vertOffset) {
// lot's of boundaries to check
if (colIdx > 3 || (vertOffset > 0 && rowIdx > 2) || (vertOffset < 0 && rowIdx < 3)) return null;
return ( Math.abs(board[colIdx][rowIdx] + board[colIdx + 1][rowIdx + vertOffset] + board[colIdx + 2][rowIdx + (vertOffset * 2)] + board[colIdx + 3][rowIdx + (vertOffset * 3)]) === 4 ) ? board[colIdx][rowIdx] : null;
}