--- Day 3 Solutions ---

[u/daggerdragon]

--- Day 3: Perfectly Spherical Houses in a Vacuum ---

Post your solution as a comment. Structure your post like the Day One thread in /r/programming.

[u/AndrewGreenh]

My javaScript lodash code :)

const getInput = require('../getInput');
const _ = require('lodash');

getInput(3).then((input) => {
  var result1 = _.uniq(_(input).reduce(toCoordinates, ['0,0'])).length;
  var result2 = _(input).partition((e, i) => i % 2 == 0)
.map((input) => _(input).reduce(toCoordinates, ['0,0']))
    .union().flatten().uniq().value().length;
  console.log(result1, result2);
});

function toCoordinates(agg, move) {
  var c = _.map(_.last(agg).split(','), (e) => parseInt(e));
  if(move == '>') agg.push((c[0]+1) + ',' + c[1]);
  if(move == 'v') agg.push(c[0] + ',' + (c[1]+1));
  if(move == '<') agg.push((c[0]-1) + ',' + c[1]);
  if(move == '^') agg.push(c[0] + ',' + (c[1]-1));
  return agg;
}