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40 lines
1.3 KiB
40 lines
1.3 KiB
const SIZE = 100 |
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const FREE = 0 |
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const UNSAFE = -1 |
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const FILLED = 1 |
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const MAP = new Int8Array(SIZE * SIZE) |
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const isFree = ({ x, y }) => MAP[y * SIZE + x] < FILLED |
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const isUnsafe = ({ x, y }) => MAP[y * SIZE + x] === UNSAFE |
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const setUnsafe = ({ x, y }) => MAP[y * SIZE + x] = UNSAFE |
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const setFilled = ({ x, y }) => MAP[y * SIZE + x] = FILLED |
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const inBounds = n => n < SIZE && n >= 0 |
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const isInBounds = ({ x, y }) => inBounds(x) && inBounds(y) |
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const isNotBackward = el => el.direction !== 2 |
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const isForward = el => el.direction === 0 |
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const isRight = el => el.direction === 1 |
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const isLeft = el => el.direction === 3 |
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const goForward = arr => arr.find(isForward) |
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const goRight = arr => arr.find(isRight) |
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const goLeft = arr => arr.find(isLeft) |
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const isOtherPlayer = player => !player.isOwnPlayer |
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// `snailIt` goes with the form of a snail |
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const snailIt = arr => goRight(arr) || goForward(arr) || goLeft(arr) |
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const update = ({ player, players }) => { |
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players.forEach(setFilled) |
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players |
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.filter(isOtherPlayer) |
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.flatMap(({ coords }) => coords) |
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.filter(isInBounds) |
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.filter(isFree) |
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.forEach(setUnsafe) |
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const coordsInBound = player.coords |
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.filter(isInBounds) |
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.filter(isNotBackward) |
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const available = snailIt(coordsInBound.filter(isFree)) |
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const lastResort = snailIt(coordsInBound.filter(isUnsafe)) |
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return available || lastResort |
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}
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