advent 2023

day 2.txt

A = Rock     
B = Paper    
C = Scissors


X = Rock     = 1
Y = Paper    = 2
Z = Scissors = 3

PART 1

A X = 3 + 1 = 4
A Y = 6 + 2 = 8
A Z = 0 + 3 = 3

B X = 0 + 1 = 1
B Y = 3 + 2 = 5
B Z = 6 + 3 = 9

C X = 6 + 1 = 7
C Y = 0 + 2 = 2
C Z = 3 + 3 = 6

PART 2

X = lose
Y = draw
Z = win

A Y = 3 + 1 = 4
A Z = 6 + 2 = 8
A X = 0 + 3 = 3

B X = 0 + 1 = 1
B Y = 3 + 2 = 5
B Z = 6 + 3 = 9

C Z = 6 + 1 = 7
C X = 0 + 2 = 2
C Y = 3 + 3 = 6

day 3.js

codeOfCapitalA = 'A'.charCodeAt(0)
codeOfA = 'a'.charCodeAt(0)
getPriority = (c) => c.charCodeAt(0) - (c.charCodeAt(0) < codeOfA ? codeOfCapitalA - 27 : codeOfA - 1)

// part 1
x.map(items => {
    x1 = items.slice(0, items.length / 2).split('')
    x2 = items.slice(items.length / 2).split('')
    dup = x1.find(item => x2.indexOf(item) !== -1);
    return getPriority(dup)
}).reduce((sum, p) => sum + p, 0)

// part 2

codeOfCapitalA = 'A'.charCodeAt(0)
codeOfA = 'a'.charCodeAt(0)
getPriority = (c) => c.charCodeAt(0) - (c.charCodeAt(0) < codeOfA ? codeOfCapitalA - 27 : codeOfA - 1)

groups = []
for (let i = 0; i < x.length; i += 3) {
    groups.push(x.slice(i, i + 3))
}

groups.map(group => {
    dup = group[0].find(i => group[1].indexOf(i) !== -1 && group[2].indexOf(i) !== -1)
    return getPriority(dup)
}).reduce((sum, p) => sum + p, 0)