adventofcode day 7

adventofcode.js

var lines = `123 -> x
456 -> y
x AND y -> d
x OR y -> e
x LSHIFT 2 -> f
y RSHIFT 2 -> g
NOT x -> h
NOT y -> i`.split('\n');

var wires = {};

function resolve(line) {
  var operators = {'AND':'&','OR':'|','LSHIFT':'<<','RSHIFT':'>>','NOT':'~'}
  line = line.replace(/AND|OR|LSHIFT|RSHIFT|NOT/, (op) => operators[op]);
  
  var components = line.match(/^(.+) -> ([a-z]+)$/);
  var command = components[1].replace(/(\w+|\d+)/g, unwrap);
  
  if (/undefined/.test(command)) {
    return false;
  } else {
    wires[components[2]] = eval(command) & 65535;
    return true;
  }
}

function unwrap(pointer) {
  return ( /\d/.test(pointer) ) ? parseInt(pointer) : wires[pointer];
}

while (lines.length) {
  var command = lines.shift();
  if ( resolve(command) == false ) lines.push(command);
}

console.log( wires );