53 lines
1.3 KiB
JavaScript
53 lines
1.3 KiB
JavaScript
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// TODO: Hide accumulator inside
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function evolve(state, acc, rules) {
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const [x, y, z, ...xs] = state;
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if (!xs.length) {
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return acc[acc.length - 1] + acc + acc[0];
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}
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const rule = x + y + z;
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const newAcc = acc.concat(rules[rule]);
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return evolve(y + z + xs.join(''), newAcc, rules);
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}
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function conwayRules(cell, neighbors) {
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// loneliness rule
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if (cell === 1 && neighbors < 2) return 0;
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// overpopulation rule
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if (cell === 1 && neighbors > 3) return 0;
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// born when three live neighbors rule
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if (cell === 0 && neighbors === 3) return 1;
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// the cell remains the same if none apply
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return cell;
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}
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function getDrawingValues(state, acc, cell) {
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const d = cell.dimension;
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return Object.keys(state).map(
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(key) => {
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const fillStyle = state[key] === '1' ? cell.liveColor : cell.deadColor;
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return {
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move: [key * d, acc * d],
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fill: [key * d, acc * d, d, d],
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fillStyle,
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};
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},
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);
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}
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function initialState1D(width, initFn, args) {
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return [...Array(width)].map(
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() => initFn(...args).toString(),
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).join('');
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}
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function initialState2D(width, height, initFn, args) {
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return [...Array(height)].map(
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() => [...Array(width)].map(() => initFn(...args)),
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);
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}
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export {
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evolve, getDrawingValues, initialState1D, initialState2D,
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};
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