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Copy pathday8.js
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day8.js
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const fs = require('fs');
const main = () => {
const input = fs.readFileSync('day8input.txt').toString();
const numPixels = 25*6;
const numLayers = input.length/numPixels;
const layers = [];
for (let i = 0; i < numLayers; i = i + 1) {
const oneLayer = input.substr(i * numPixels, numPixels);
layers.push(oneLayer);
}
let currentImage = null;
for (const layer of layers) {
if (currentImage === null) {
currentImage = layer;
continue;
}
for (let i = 0; i < numPixels; i++) {
if (currentImage[i] === '2' && layer[i] !== '2') {
currentImage = replaceAt(currentImage, i, layer[i]);
}
}
}
for (let i = 0; i < 6; i++) {
console.log(currentImage.substr(i*25, 25));
}
};
const replaceAt = (text, index, replacement) => {
return text.substr(0, index) + replacement+ text.substr(index + replacement.length);
}
main();