71 lines
1.7 KiB
JavaScript
71 lines
1.7 KiB
JavaScript
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import fs from "fs-extra";
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import fp from "lodash/fp.js";
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import _ from "lodash";
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export const processInput = (input) => fs.readFile(input,'utf8').then(
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content => {
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let [ coords, instructions ] = content.split("\n\n");
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let grid = [];
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for( const [y,x] of coords.split("\n").map(line => line.split(",").map( x => parseInt(x) )) ) {
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if(!grid[x]) grid[x] = [];
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grid[x][y] = true;
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}
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grid = [...grid];
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grid = grid.map( x => x? [...x]:[] );
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instructions = instructions.split("\n").filter(x=>x).map( line => line.match(/([xy])=(\d+)/) )
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.map( ([_,direction,level]) => ([direction,parseInt(level)]) );
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return {
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grid,
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instructions,
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}
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}
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);
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export function foldGrid(grid,direction,level) {
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if(direction === 'x') {
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for( const row of grid ) {
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if(!row) continue;
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const folded = row.splice(level);
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folded.forEach((v,i) => {
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if(i===0) return;
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if(!v) return;
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row[level-i] = v;
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})
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}
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return grid;
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}
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const folded = grid.splice(level);
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folded.forEach((v,i) => {
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if(i===0) return;
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if(!v) return;
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grid[level-i] =
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_.range(_.max([grid[level-i].length,folded[i].length])).
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map( j => grid[level-i][j] || folded[i][j] );
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})
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return grid;
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}
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export function printGrid(grid) {
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return grid.map( line =>
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(line||[]).map( x => x ? '#':'.' ).join('')
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).join("\n");
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}
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export function solution({grid, instructions}) {
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foldGrid(grid,...instructions.shift());
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return _.sum(grid.flat());
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}
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