Advent of Code 2016

adventofcode16.js

// Chrome DevTools console ~~ enter pt.1 & 2 separately
// var input = $({auto-generated <pre>-tag w/ input txt}).textContent.trimTrailingNL();

// I.)
input.split(', ').reduce(function (o,e,i,a) {
  o.i=(o.i+(e[0]=='L'?3:5))%4;
  o[o.i%2]+=(o.i>1?-1:1)*+e.substr(1);
  return i+1==a.length?Math.abs(o[0])+Math.abs(o[1]):o;
},{i:0,0:0,1:0})
input.split(', ').reduce(function (o,e,s,n) {
  if (typeof o === 'number') return o;
  o.i=(o.i+(e[0]=='L'?3:5))%4;
  return new Array(+e.substr(1)).fill(o.i>1?-1:1).every(function (t) {
	return (o[o.i%2] += t),(o.c.size < o.c.add(o[0] + ',' + o[1]).size)
  }) ? o: Math.abs(o[0])+Math.abs(o[1])
},{i:0,0:0,1:0,c:new Set(['0,0'])})


// II.)
input.split('\n').reduce(function (o,l) {
	l.split('').forEach(c => o.p = o[c](o.p));
	o.c+=''+(o.p+1);
	return o;
}, {
	p:4,
	c:'',
	U:n=>n>2?n-3:n,
	D:n=>n<6?n+3:n,
	L:n=>n%3>0?n-1:n,
	R:n=>n%3<2?n+1:n
}).c;
var ud = [0,0,2,0,0,4,4,4,0,4,4,4,2];
var lr = [0,0,1,1,0,1,1,1,1,0,1,1,0];
input.split('\n').reduce(function (o,l) {
	l.split('').forEach(function (cc) {o.p=o[cc](o.p); });
	o.c=o.c+''+(o.p + 1).toString(16);
	return o;
}, {
	p:4,
	c:'',
	U:n=>n-ud[n],
	D:n=>n+ud.slice().reverse()[n],
	L:n=>n-lr[n],
	R:n=>n+lr.slice().reverse()[n]
}).c.toUpperCase();


// III.)
input.split('\n').filter(function (a) {
  a = a.split(/\s+/).slice(1).map(parseFloat).sort();
  return a[0]+a[1]>a[2] && a[1]+a[2]>a[0] && a[0]+a[2]>a[1]
})