2020 day 12 + visualisation

2020/12/part1.js

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+// cool today's puzzle is basically a turtle
+const fs = require('fs');
+const instructions = fs.readFileSync('input.txt', 'utf-8').split('\n');
+// position and direcion start at 0
+let x = y = d = 0;
+instructions.forEach((instruction, i) => {
+  console.log(x,y,d)
+  action = instruction[0];
+  arg = Number(instruction.slice(1));
+  switch (action) {
+    case 'N':
+      y+=arg;
+      break;
+    case 'S':
+      y-=arg;
+      break;
+    case 'E':
+      x+=arg;
+      break;
+    case 'W':
+      x-=arg;
+      break;
+    case 'L':
+      d-=arg;
+      break;
+    case 'R':
+      d+=arg;
+      break;
+    case 'F':
+      y -= Math.round(arg * Math.sin(d*Math.PI/180));
+      x += Math.round(arg * Math.cos(d*Math.PI/180));
+      break;
+    default:
+      console.log('instruction no', i+1, action,'invald')
+  }
+})
+console.log(x,y,d)
+console.log(Math.abs(x)+ Math.abs(y))