2048 the game #422
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,3 +1,218 @@ | ||
| 'use strict'; | ||
|
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| const columns = [[], [], [], []]; | ||
| const rows = Array.from(document.querySelectorAll('.field-row')); | ||
| const cells = document.querySelectorAll('.field-cell'); | ||
| const cellsInRow = rows.map(row => [...row.querySelectorAll('.field-cell')]); | ||
|
|
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| for (let i = 0; i < 4; i++) { | ||
| for (let j = 0; j < 4; j++) { | ||
| columns[j].push(rows[i].children[j]); | ||
| } | ||
| } | ||
|
|
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| const button = document.querySelector('.start'); | ||
| const startMessage = document.querySelector('.message-start'); | ||
| const loseMessage = document.querySelector('.message-lose'); | ||
| const winMessage = document.querySelector('.message-win'); | ||
| const score = document.querySelector('.game-score'); | ||
| const moveSound = document.getElementById('audio-move'); | ||
| const looseSound = document.getElementById('audio-loose'); | ||
| const winSound = document.getElementById('audio-win'); | ||
|
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| let clearCells = [...cells]; | ||
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| function getRandomCell() { | ||
| return clearCells[Math.floor(Math.random() * clearCells.length)]; | ||
| } | ||
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| function getCellValue() { | ||
| return Math.random() < 0.9 ? 2 : 4; | ||
| } | ||
|
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| function newCell() { | ||
| if (!clearCells.length) { | ||
| return; | ||
| } | ||
|
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| const randomCell = getRandomCell(); | ||
| const randomValue = getCellValue(); | ||
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| randomCell.className = `field-cell field-cell--${randomValue}`; | ||
| randomCell.innerText = randomValue; | ||
|
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| clearCells.splice(clearCells.indexOf(randomCell), 1); | ||
| } | ||
|
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| let started = false; | ||
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| function startGame() { | ||
| startMessage.style.display = 'none'; | ||
| button.className = 'button restart'; | ||
| button.innerText = 'Restart'; | ||
|
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| newCell(); | ||
| newCell(); | ||
| started = true; | ||
| } | ||
|
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| function restartGame() { | ||
| loseMessage.classList.add('hidden'); | ||
| winMessage.classList.add('hidden'); | ||
| clearCells = [...cells]; | ||
| score.innerText = 0; | ||
|
|
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| cells.forEach(cell => { | ||
| cell.innerText = ''; | ||
| cell.className = 'field-cell'; | ||
| }); | ||
|
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| newCell(); | ||
| newCell(); | ||
| } | ||
|
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| button.addEventListener('click', () => { | ||
| if (!started) { | ||
| startGame(); | ||
| } else { | ||
| restartGame(); | ||
| } | ||
| }); | ||
|
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| function canBeMerged() { | ||
| const wholeField = [...cellsInRow, ...columns]; | ||
|
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| return wholeField.some((line) => { | ||
| for (let i = 0; i < 3; i++) { | ||
| if (line[i].innerText === line[i + 1].innerText) { | ||
| return true; | ||
| } | ||
| } | ||
|
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| return false; | ||
| }); | ||
| } | ||
|
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| let flipped = false; | ||
|
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| function flipLine(line) { | ||
| for (let i = 3; i > 0; i--) { | ||
| const canBeMooved = clearCells.includes(line[i]) | ||
| && !clearCells.includes(line[i - 1]); | ||
| const mergeAllowed = line[i].innerText === line[i - 1].innerText | ||
| && line[i].innerText.length | ||
| && !line[i - 1].dataset.blocked; | ||
|
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| if ((mergeAllowed || canBeMooved) && !flipped) { | ||
| flipped = true; | ||
| } | ||
|
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| if (mergeAllowed) { | ||
| mergeCells(line[i], line[i - 1]); | ||
| flipLine(line); | ||
| } | ||
|
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| if (canBeMooved) { | ||
| flipElements(line[i], line[i - 1]); | ||
| flipLine(line); | ||
| } | ||
| } | ||
| } | ||
|
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| function mergeCells(curr, prev) { | ||
| const value = curr.innerText * 2; | ||
|
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| curr.innerText = value; | ||
| curr.className = `field-cell field-cell--${value}`; | ||
| score.innerText = +score.innerText + value; | ||
| deleteElement(prev); | ||
|
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| curr.dataset.blocked = true; | ||
| prev.dataset.blocked = true; | ||
|
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| if (value === 2048) { | ||
| winMessage.classList.remove('hidden'); | ||
| winSound.currentTime = 0; | ||
| winSound.play(); | ||
| } | ||
| } | ||
|
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| function flipElements(curr, prev) { | ||
| curr.innerText = prev.innerText; | ||
| curr.className = prev.className; | ||
| clearCells = clearCells.filter(cell => cell !== curr); | ||
| deleteElement(prev); | ||
| } | ||
|
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| function deleteElement(element) { | ||
| element.innerText = ''; | ||
| element.className = 'field-cell'; | ||
| clearCells.push(element); | ||
| } | ||
|
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| function getDirection(direction) { | ||
| if (!clearCells.length && !canBeMerged()) { | ||
| loseMessage.classList.remove('hidden'); | ||
| looseSound.currentTime = 0; | ||
| looseSound.play(); | ||
| } | ||
|
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| const up = 'ArrowUp'; | ||
| const down = 'ArrowDown'; | ||
| const right = 'ArrowRight'; | ||
| const left = 'ArrowLeft'; | ||
|
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| switch (direction) { | ||
| case up: | ||
| columns.forEach((column) => { | ||
| flipLine([...column].reverse()); | ||
| }); | ||
| break; | ||
|
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| case down: | ||
| columns.forEach((column) => { | ||
| flipLine(column); | ||
| }); | ||
| break; | ||
|
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| case right: | ||
| cellsInRow.forEach((row) => { | ||
| flipLine(row); | ||
| }); | ||
| break; | ||
|
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| case left: | ||
| cellsInRow.forEach((row) => { | ||
| flipLine([...row].reverse()); | ||
| }); | ||
| break; | ||
|
Comment on lines
+184
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+188
There was a problem hiding this comment. Switch case should always have default case to handle possible errors |
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| default: | ||
| break; | ||
| } | ||
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| cells.forEach(cell => { | ||
| cell.removeAttribute('data-blocked'); | ||
| }); | ||
| } | ||
|
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| document.body.addEventListener('keydown', (evnt) => { | ||
| const arrowDirections = [ | ||
| 'ArrowUp', | ||
| 'ArrowDown', | ||
| 'ArrowLeft', | ||
| 'ArrowRight', | ||
| ]; | ||
|
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| if (arrowDirections.includes(evnt.key)) { | ||
| evnt.preventDefault(); | ||
| getDirection(evnt.key); | ||
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| if (flipped) { | ||
| moveSound.currentTime = 0; | ||
| moveSound.play(); | ||
| newCell(); | ||
| flipped = false; | ||
| } | ||
| } | ||
| }); | ||
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The condition 'clearCells.length === undefined' can be simplified to '!clearCells.length' which checks if the array is empty or not.