56 lines
1.3 KiB
JavaScript
56 lines
1.3 KiB
JavaScript
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import { readFileSync } from 'node:fs';
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const input = readFileSync('input', 'utf-8');
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const cycles = input
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.split('\n')
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.filter(line => line)
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.flatMap((() => {
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let x = 1;
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return (line) => {
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if (line.startsWith('noop')) {
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return [x];
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}
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if (line.startsWith('addx')) {
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const add = parseInt(line.substring(5));
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if (isNaN(add)) {
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throw new Error('Invalid value for addx');
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}
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const result = [x, x];
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x += add;
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return result;
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}
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};
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})());
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const sumOfSignalStrengths = [20, 60, 100, 140, 180, 220]
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.map(c => {
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const x = cycles[c - 1];
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const strength = c * x;
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return strength;
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})
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.reduce((total, strength) => total + strength);
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console.log(
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`The sum of observed signal strengths is: ${sumOfSignalStrengths}`
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);
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const render = cycles
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.map((x, c) => {
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const scanPos = c % 40;
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return [x - 1, x, x + 1].some(pixelPos => pixelPos === scanPos);
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})
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.reduce((display, pixelVisible, c) => {
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const scanLine = Math.floor(c / 40);
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if (!display[scanLine]) {
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display.push([]);
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}
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display[scanLine].push(pixelVisible ? '#' : ' ');
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return display;
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}, [])
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.map(scanLine => scanLine.join(''))
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.join('\n');
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console.log('Display output:');
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console.log(render);
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