35 lines
807 B
JavaScript
35 lines
807 B
JavaScript
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#!/bin/node
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const fs = require('fs');
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fs.readFile('input.txt', (err, data) => {
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const lines = data.toString().split('\n').filter(l => l.length > 0);
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width = lines[0].length;
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const slopes = [
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[1, 1],
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[3, 1],
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[5, 1],
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[7, 1],
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[1, 2],
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];
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const positions = slopes.map(_ => 0);
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const results = slopes.map(_ => 0);
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for (let i = 0; i < lines.length; i++) {
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const line = lines[i];
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for (let j = 0; j < slopes.length; j++) {
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const [right, down] = slopes[j];
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if (i % down === 0) {
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if (line[positions[j]] === '#') results[j]++;
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positions[j] = (positions[j] + right) % width;
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}
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}
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}
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console.log(results, results.reduce((a, n) => a * n, 1));
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});
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