elf3.js

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//Part 1
let myArray = rucksackData.split(`\n`);

function getIntersection(setA, setB) { //A function to find the common character between two sets
    const intersection = new Set(
        [...setA].filter(element => setB.has(element))
    );

    return intersection;
}

let score = 0;
let finalScore = 0;

for (let i = 0; i < myArray.length; i++) { //Targets all the data line by line
    let x = myArray[i]; //Targets the data on whichever line we are up to
    let partOne = x.slice(0, x.length / 2) //Creates an array of the first half of the data on this line 
    let partTwo = x.slice(x.length / 2, x.length) //Second half of data array

    //Turns the arrays into sets
    let oneArray = new Set(partOne.split(''));
    let twoArray = new Set(partTwo.split(''));

    //Calls the function created above; returns the common char as a set
    let val = getIntersection(oneArray, twoArray);

    //Turns the resulting set (containing only the common char) back into an array
    val = Array.from(val);

    val = val[0]; //Targets the first (and only) character in the array
    score = val.charCodeAt([0]); //Turns this character into ASCII code

    if ((score > 96) && (score < 123)) { //If the code corresponds to lowercase letter, - 96 from it to = the priority value
        finalScore += (score - 96);
    } else if ((score > 64) && (score < 91)) { //Same but for uppercase letter
        finalScore += (score - 38);
    }
}
console.log(finalScore);


//Part 2

//Resets these variables to be reused 
score = 0;
finalScore = 0;

for (let i = 0; i < myArray.length; i += 3) { //Adds 3 to i every time the loop iterates, to process 3 lines at a time without repeats
    //Creates one new set per line
    let lineOne = new Set(myArray[i]);
    let lineTwo = new Set(myArray[i + 1]);
    let lineThree = new Set(myArray[i + 2]);

    //Finds the common char between all three sets, returns the answer as a set
    let val1 = getIntersection(lineOne, lineTwo);
    let val2 = getIntersection(val1, lineThree);

    //Turns the resulting set (containing only the common char) back into an array
    val = Array.from(val2);

    val = val[0]; //Targets the first (and only) character in the array
    score = val.charCodeAt([0]); //Turns this character into ASCII code

    if ((score > 96) && (score < 123)) { //If the code corresponds to lowercase letter, - 96 from it to = the priority value
        finalScore += (score - 96);
    } else if ((score > 64) && (score < 91)) { //Same but for uppercase letter
        finalScore += (score - 38);
    }
}
console.log(finalScore);