hydronoid / advent-of-code-2022

Advent of Code 2022

My attempt at the Advent of Code 2022 challenges, done in JavaScript

What I learned on each day

Day 1 - reading from files in JS, sorting arrays in JS
Day 2 - using char codes(?)
Day 3 - exploiting the use of null as false for conditions
Day 4 - swapping parameters to a function, string formatting in JS
Day 5 - array shifting/unshifting/splicing, shallow copies of arrays, using regex in str.replace()
Day 6 - set objects
Day 7 - array sums (via arr.reduce()), filtering, refreshing my recursion knowledge
Day 8 - array methods: .findIndex() and .every()
Day 9 - sometimes brute force works...
Day 10 - using .forEach() for better clarity & succinctness
Day 11 - a modular arithmetic property: $\forall k.\ ((a \mod km) \mod m = a \mod m)$, plus improving my input parsing
Day 12 - BFS for undirected unweighted graphs, more succinct 2D array initialisation
Day 13 - multiple args in .forEach(element, index, array), realising indexOf() doesn't work as intended for subarrays, JSON.parse() as an alternative to eval() for strings of arrays
Day 14 - creating a "range"-like array in one line, and an alternative solution is memoizing the path of each previous grain of sand and then starting at the last position before it landed (although I didn't implement this)
Day 15 - max = Math.max(max, x); instead of if (x > max) max = x; (and likewise for min), for ... of loops (I should've known about this way earlier), and sometimes functions originally intended to return booleans don't always have only two outcomes

Day 20 - modulo vs. remainder (i.e. function mod(a, b) {return ((a % b) + b) % b;})

Total stars: 36/50