Part 1 and 2 JS solution, toggle part2 to true or false depending on your needs!
part2
const fs = require("fs"); const data = fs.readFileSync("input.txt", "utf8").split("\n"); let x = 0, y = 0, dir = 0, part2 = true, ws = [10, 1]; for (i in data) { let direction = data[i].match(/\D/)[0]; let steps = Number(data[i].match(/\d+\b/)[0]); switch (direction) { case "F": if (!part2) { if (dir == 0) x += steps if (dir == 1) y -= steps if (dir == 2) x -= steps if (dir == 3) y += steps } else { x += ws[0] * steps y += ws[1] * steps } break; case "R": dir += (steps / 90) dir = dir % 4 if (part2) { for (let i = 0; i < (steps / 90); i++) { ws = ws.reverse() ws[1] = -1 * ws[1] } } break; case "L": dir += 4 - (steps / 90) dir = dir % 4 if (part2) { for (let i = 0; i < (steps / 90); i++) { ws = ws.reverse() ws[0] = -1 * ws[0] } } break; case "W": if (!part2) x -= steps else ws[0] = ws[0] - steps break; case "E": if (!part2) x += steps else ws[0] = ws[0] + steps break; case "S": if (!part2) y -= steps else ws[1] = ws[1] - steps break; case "N": if (!part2) y += steps else ws[1] = ws[1] + steps break; } } console.log(Math.abs(x) + Math.abs(y))
Here it is minified (498 characters, not tweet-sized 🙄):
const e=require("fs").readFileSync("input.txt","utf8").split("\n");let a=0,r=0,s=0,t=[10,1];for(i in e){let c=e[i].match(/\D/)[0],b=Number(e[i].match(/\d+\b/)[0]);switch(c){case"F":a+=t[0]*b,r+=t[1]*b;break;case"R":s+=b/90,s%=4;for(let e=0;e<b/90;e++)t=t.reverse(),t[1]=-1*t[1];break;case"L":s+=4-b/90,s%=4;for(let e=0;e<b/90;e++)t=t.reverse(),t[0]=-1*t[0];break;case"W":t[0]=t[0]-b;break;case"E":t[0]=t[0]+b;break;case"S":t[1]=t[1]-b;break;case"N":t[1]=t[1]+b}}console.log(Math.abs(a)+Math.abs(r))
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Part 1 and 2 JS solution, toggle
part2
to true or false depending on your needs!Here it is minified (498 characters, not tweet-sized 🙄):