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Predictability of validMove function #5

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Predictability of validMove function #5

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5 changes: 3 additions & 2 deletions 001-snake/snake.js
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Original file line number Diff line number Diff line change
Expand Up @@ -9,14 +9,15 @@ const WEST = { x:-1, y: 0 }

// Point operations
const pointEq = p1 => p2 => p1.x == p2.x && p1.y == p2.y
const pointOp = p1 => p2 => p1.x == -p2.x && p1.y == -p2.y

// Booleans
const willEat = state => pointEq(nextHead(state))(state.apple)
const willCrash = state => state.snake.find(pointEq(nextHead(state)))
const validMove = move => state =>
state.moves[0].x + move.x != 0 || state.moves[0].y + move.y != 0
const validMove = move => state => !pointEq(move)(lastMove(state)) && !pointOp(move)(lastMove(state))

// Next values based on state
const lastMove = state => state.moves[state.moves.length - 1]
const nextMoves = state => state.moves.length > 1 ? dropFirst(state.moves) : state.moves
const nextApple = state => willEat(state) ? rndPos(state) : state.apple
const nextHead = state => state.snake.length == 0
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