scrimba
Build Pac-Man in JavaScript
Explaining Modulus
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Explaining Modulus
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Explaining Modulus
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index.js
run
preview
console
const width = 28
const grid = document.querySelector('.grid')
const scoreDisplay = document.getElementById('score')
let squares = []

// 0 - pacdots
// 1 - wall
// 2 - ghost lair
// 3 - powerpellets
// 4 - empty

const layout = [
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,0,0,0,0,0,0,0,0,0,0,0,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,1,
1,0,1,1,1,1,0,1,1,1,1,1,0,1,1,0,1,1,1,1,1,0,1,1,1,1,0,1,
1,3,1,1,1,1,0,1,1,1,1,1,0,1,1,0,1,1,1,1,1,0,1,1,1,1,3,1,
1,0,1,1,1,1,0,1,1,1,1,1,0,1,1,0,1,1,1,1,1,0,1,1,1,1,0,1,
1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,
1,0,1,1,1,1,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,1,1,1,1,0,1,
1,0,1,1,1,1,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,1,1,1,1,0,1,
1,0,0,0,0,0,0,0,0,0,0,0,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,1,
1,1,1,1,1,1,0,1,1,1,1,1,0,1,1,0,1,1,1,1,1,0,1,1,1,1,1,1,
1,1,1,1,1,1,0,1,1,4,4,4,4,4,4,4,4,4,4,1,1,0,1,1,1,1,1,1,
1,1,1,1,1,1,0,1,1,4,1,1,1,2,2,1,1,1,4,1,1,0,1,1,1,1,1,1,
1,1,1,1,1,1,0,1,1,4,1,2,2,2,2,2,2,1,4,1,1,0,1,1,1,1,1,1,
4,4,4,4,4,4,0,0,0,4,1,2,2,2,2,2,2,1,4,0,0,0,4,4,4,4,4,4,
1,1,1,1,1,1,0,1,1,4,1,2,2,2,2,2,2,1,4,1,1,0,1,1,1,1,1,1,
1,1,1,1,1,1,0,1,1,4,1,1,1,1,1,1,1,1,4,1,1,0,1,1,1,1,1,1,
1,1,1,1,1,1,0,1,1,4,1,1,1,1,1,1,1,1,4,1,1,0,1,1,1,1,1,1,
1,0,0,0,0,0,0,0,0,4,4,4,4,4,4,4,4,4,4,0,0,0,0,0,0,0,0,1,
1,0,1,1,1,1,0,1,1,1,1,1,0,1,1,0,1,1,1,1,1,0,1,1,1,1,0,1,
1,0,1,1,1,1,0,1,1,1,1,1,0,1,1,0,1,1,1,1,1,0,1,1,1,1,0,1,
1,3,0,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,0,0,3,1,
1,1,1,0,1,1,0,1,1,0,1,1,1,1,1,1,1,1,0,1,1,0,1,1,0,1,1,1,
1,1,1,0,1,1,0,1,1,0,1,1,1,1,1,1,1,1,0,1,1,0,1,1,0,1,1,1,
1,0,0,0,0,0,0,1,1,0,0,0,0,1,1,0,0,0,0,1,1,0,0,0,0,0,0,1,
1,0,1,1,1,1,1,1,1,1,1,1,0,1,1,0,1,1,1,1,1,1,1,1,1,1,0,1,
1,0,1,1,1,1,1,1,1,1,1,1,0,1,1,0,1,1,1,1,1,1,1,1,1,1,0,1,
1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1
]

//create board
function createBoard() {
//for loop
for (let i = 0; i < layout.length; i++) {
//create a square
const square = document.createElement('div')
//put square in grid
grid.appendChild(square)
//put square in squares array
squares.push(square)

if (layout[i] === 0) {
squares[i].classList.add('pac-dot')
} else if (layout[i] === 1) {
squares[i].classList.add('wall')
} else if (layout[i] === 3) {
squares[i].classList.add('power-pellet')
}

}
}
createBoard()

// down - 40
// up key - 38
// left - 37
// right - 39

//starting position of pacman
let pacmanCurrentIndex = 490
squares[pacmanCurrentIndex].classList.add('pacman')

function control(e) {
switch(e.keyCode) {
case 40:
console.log('pressed down')

break
case 38:
console.log('pressed up')

break
case 37:
console.log('pressed left')

break
case 39:
console.log('pressed right')

break
}
}
document.addEventListener('keyup', control)
Console
"pressed down"
,
"pressed up"
,
"pressed right"
,
"pressed left"
,
/index.html
-3:37