var instructions = []; var registers = {a: 0, b: 0, c: 1, d: 0}; var instructionSet = {}; instructionSet.cpy = (a, b)=>{ if(Number.isInteger(parseInt(a))){ registers[b] = parseInt(a); } else{ registers[b] = registers[a]; } } instructionSet.inc = (a)=>{ registers[a]++; } instructionSet.dec = (a)=>{ registers[a]--; } instructionSet.jnz = (a, b)=>{ if((registers[a] != 0) || ((parseInt(a) != 0) && (!isNaN(parseInt(a))))){ pc = pc + (parseInt(b) - 1); } } var input = require("fs").readFileSync("input.txt").toString().replace(/\r/g, ""); var instructions = input.split("\n").filter((a)=>(a)).map((instruction)=>{ if(instruction.indexOf("cpy") > -1){ var instructionParts = instruction.match("cpy ([^ ]+) ([^ ]+)"); return ["cpy", [instructionParts[1], instructionParts[2]]]; } if(instruction.indexOf("inc") > -1){ var instructionParts = instruction.match("inc ([^ ]+)"); return ["inc", [instructionParts[1]]]; } if(instruction.indexOf("dec") > -1){ var instructionParts = instruction.match("dec ([^ ]+)"); return ["dec", [instructionParts[1]]]; } if(instruction.indexOf("jnz") > -1){ var instructionParts = instruction.match("jnz ([^ ]+) ([^ ]+)"); return ["jnz", [instructionParts[1], instructionParts[2]]]; } }); var pc = 0; while(pc < instructions.length){ instructionSet[instructions[pc][0]].apply(null, instructions[pc][1]); pc++; } console.log(registers); console.log(registers[a]);