[Day 25](https://adventofcode.com/2018/day/25)[Day 18](https://adventofcode.com/2018/day/18)[Day 21](https://adventofcode.com/2018/day/21)Day 19[Day 16](https://adventofcode.com/2018/day/16)[Day 13](https://adventofcode.com/2018/day/13)[Day 12](https://adventofcode.com/2018/day/12)[Day 11](https://adventofcode.com/2018/day/11)[Day 10](https://adventofcode.com/2018/day/10)[Day 9](https://adventofcode.com/2018/day/9)[Day 8](https://adventofcode.com/2018/day/8)[Day 7](https://adventofcode.com/2018/day/7)[Day 6](https://adventofcode.com/2018/day/6)[Day 5](https://adventofcode.com/2018/day/5)[Day 4](https://adventofcode.com/2018/day/4)[Day 3](https://adventofcode.com/2018/day/3)Advent of Code: [Day 2](https://adventofcode.com/2018/day/2)[Day 1](https://adventofcode.com/2018/day/1)
[Day 14](https://adventofcode.com/2018/day/14)
part1 = {
let numRecipes = Number(INPUT);
let scores = [3, 7];
let elf1 = 0;
let elf2 = 1;
while (scores.length < numRecipes + 10) {
elf1 = (elf1 + 1 + scores[elf1]) % scores.length;
elf2 = (elf2 + 1 + scores[elf2]) % scores.length;
// each recipe score is 0-9, so their sum is 0-18
// if the sum is > 9, push a 1 and then the unit digit
let newScores = scores[elf1] + scores[elf2];
if (newScores > 9) {
scores.push(1, newScores % 10);
} else {
scores.push(newScores);
}
}
return Number(scores.slice(numRecipes, numRecipes + 10).join(''));
}
function arrayEndsWith (array, subarray) {
for (let i = 1; i <= subarray.length; i++) {
if (array[array.length - i] !== subarray[subarray.length - i]) {
return false;
}
}
return true;
}
part2 = {
let target = INPUT.split('').map(Number);
let scores = [3, 7];
let elf1 = 0;
let elf2 = 1;
while (true) {
elf1 = (elf1 + 1 + scores[elf1]) % scores.length;
elf2 = (elf2 + 1 + scores[elf2]) % scores.length;
let newScores = scores[elf1] + scores[elf2];
if (newScores > 9) {
newScores = [1, newScores % 10];
} else {
newScores = [newScores];
}
for (let digit of newScores) {
scores.push(digit);
if (arrayEndsWith(scores, target)) {
return scores.length - target.length;
}
}
}
}
Purpose-built for displays of data
Observable is your go-to platform for exploring data and creating expressive data visualizations. Use reactive JavaScript notebooks for prototyping and a collaborative canvas for visual data exploration and dashboard creation.
