// EXAMPLE input (encrypted strategy guide) converted to a multiline string
const strategyGuide =
`A Y
B X
C Z`

// opponent is first column and this is opponent winning
const oppWinning = {
    A: 'Z',
    B: 'X',
    C: 'Y'    
}

// I am second column and this is me winning
const meWinning = {
    A: 'Y',
    B: 'Z',
    C: 'X'
}

// points granted for use of tool
const toolPoints = {
    X: 1,
    Y: 2,
    Z: 3
}

const getMyTotalScore = (input) => {
    const inputAsArr = input.split('\n').map(str => str.split(' ')) // the reason 'input' is converted to an array of arrays instead of an object of key-value pairs is because the ACTUAL input (i.e., not the EXAMPLE input we're working with here) would, if set up as an object, have duplicate keys, and of course duplicate keys are not allowed in JavaScript objects (iterating through the keys of a JavaScript object that has duplicate keys doesn't work)

    let myTotalScore = 0

    for (let i = 0; i < inputAsArr.length; i++) {
        myTotalScore += toolPoints[inputAsArr[i][1]]

        if (inputAsArr[i][1] === meWinning[inputAsArr[i][0]]) {
            myTotalScore += 6
        } else if (inputAsArr[i][1] === oppWinning[inputAsArr[i][0]]) {
            myTotalScore
        } else {
            myTotalScore += 3
        }
    }

    return myTotalScore
}

console.log(getMyTotalScore(strategyGuide)) // 15