Advent of Code Solutions 2017

solutions.js

// 1
function getcaptcha(digits){
  let count = 0;
  digits.split("").forEach((digit, i,ds) => {
    let nextDigit = ds[i+1] || ds[0];
    if(digit == nextDigit) count += parseInt(digit, 10);
  });
  return count;
}

// 2
function getrealarray(rawinput){
  let resarray = [];
  rawinput.split("\n").forEach(line => {
    let resarrayline = [];
    line.split("	").forEach(number => {
      resarrayline.push(parseInt(number, 10));
    });
    resarray.push(resarrayline);
    
  });
  return resarray;
}
function checksum(realarrayy){
  let value = 0;
  realarrayy.forEach((line) => {
    let max = 0;
    let min = Number.MAX_SAFE_INTEGER;
    line.forEach(num => {
      max = Math.max(num, max);
      min = Math.min(num, min);
    });
    value += max - min;
  });
  return value;
}

 // 3
function generateNumbersUntil(input){
  let current = [1];
  let size = [1];
  while(current[current.length - 1] < input){
    size[size.length] = size[size.length - 1] + 2;
    current.push(Math.pow(size[size.length - 1], 2));
  }
  return [current, size];
}
function getRing(prevposL, sizeL){
  let prevpos = prevposL[prevposL.length - 2];
  let size = sizeL[sizeL.length - 1];
  let top = [];
  let bottom = [];
  let left = [];
  let right = [];
  let i = 0;
  for(i = 0; i < size - 2; i++){
    right[i] = prevpos+1+i;
  }
  let j = 0;
  for(j = i; j < i+size; j++){
    top[j-i] = prevpos+1+j;
  }
  let k = 0;
  for(k = j; k < j+size - 2; k++){
    left[k-j] = prevpos+1+k;
  }
  let l = 0;
  for(l = k; l < k+size; l++){
    bottom[l-k] = prevpos+1+l;
  }
  return [right, top, left, bottom];
}
// do the rest manually with indexof and (.length-1)/2

// 4
function getValid(passphrases){
let numright = 0;
passphrases.split("\n").forEach(passphrase => {
let passphrases = passphrase.split(" ");
let double = {};
let success = true;
passphrases.forEach((phr) => {
if(double[phr]) success=false;
double[phr] = true;

});

if(success)numright++
});

return numright;

}

// forgot to add this one
function getValid(passphrases){
let numright = 0;
passphrases.split("\n").forEach(passphrase => {
let passphrases = passphrase.split(" ");
let double = {};
let success = true;
passphrases.forEach((phr) => {
phr = phr.split("").sort();

if(double[phr]) success=false;
double[phr] = true;

});

if(success)numright++
});

return numright;

}
// 5
function jumpstoarray(jumps){
let array = [];
jumps.split("\n").forEach(jump => array.push(parseInt(jump,10)));
return array
}
function dojumps(jumps){
    let done = true;
let i = 0;
let jumpsal = 1;
while(done){
let j = i;
i+=jumps[i];
if(i>=jumps.length || i <0) done = false;
jumps[j] = jumps[j]+1;
jumpsal++;
if(jumpsal > 1000000) throw new Error("fail");
}
return jumpsal;
}
// I did this one really slow because the jumpsal>1000000 was originally 10000 and that wasn't enough

// 6