80 lines
1.8 KiB
JavaScript
80 lines
1.8 KiB
JavaScript
"use strict";
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import { readFile } from "fs/promises";
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if (process.argv.length <= 2) {
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console.error(`Needs more args >:(`).
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process.exit(0);
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}
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const fileToRead = process.argv[2];
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const file = await readFile(fileToRead, `utf-8`);
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/** @type {Array<Array<string>>} */
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const wordSearch = [];
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const wordToLookFor = "XMAS"
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for (const line of file.split(`\n`)) {
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wordSearch.push(line.split(``));
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};
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const locationTransformers = {
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north: ([y, x], i) => [y - i, x],
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northeast: ([y, x], i) => [y - i, x + i],
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east: ([y, x], i) => [y, x + i],
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southeast: ([y, x], i) => [y + i, x + i],
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south: ([y, x], i) => [y + i, x],
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southwest: ([y, x], i) => [y + i, x - i],
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west: ([y, x], i) => [y, x - i],
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northwest: ([y, x], i) => [y - i, x - i],
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}
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let total = 0;
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// Iterating the puzzle space
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for (let y = 0, l1 = wordSearch.length; y < l1; y++) {
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for (let x = 0, l2 = wordSearch[y].length; x < l2; x++) {
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// Short-circuit for performance
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const middle = wordSearch[y][x];
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if (wordToLookFor.at(0) !== middle) {
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continue;
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};
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const valid = {
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north: true,
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northeast: true,
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east: true,
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southeast: true,
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south: true,
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southwest: true,
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west: true,
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northwest: true,
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};
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// Compare each direction against the letters in the word.
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for (const i in wordToLookFor) {
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const required = wordToLookFor.at(i);
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// Convert the coordinates for each direction then compare
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for (const direction in locationTransformers) {
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if (!valid[direction]) continue;
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const [ newY, newX ] = locationTransformers[direction](
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[y, x],
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parseInt(i)
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);
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try {
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valid[direction] = wordSearch[newY][newX] === required;
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} catch {
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valid[direction] = false;
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};
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};
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};
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total += Object.values(valid).filter(v => v).length;
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};
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};
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console.log(`Found ${total} instances of ${wordToLookFor}`);
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