checkTheExam.js

// Description:
// The first input array is the key to the correct answers to an exam, like ["a", "a", "b", "d"]. The second one contains a student's submitted answers.

// The two arrays are not empty and are the same length. Return the score for this array of answers, giving +4 for each correct answer, -1 for each incorrect answer, and +0 for each blank answer, represented as an empty string (in C the space character is used).

// If the score < 0, return 0.

// For example:

// checkExam(["a", "a", "b", "b"], ["a", "c", "b", "d"]) → 6
// checkExam(["a", "a", "c", "b"], ["a", "a", "b",  ""]) → 7
// checkExam(["a", "a", "b", "c"], ["a", "a", "b", "c"]) → 16
// checkExam(["b", "c", "b", "a"], ["",  "a", "a", "c"]) → 0

function checkExam(array1, array2) {
    //start with a score of 0
    let score = 0;
    //loop through the array of correct answer
    for (let i = 0; i < array1.length; i++) {
        //if the answer matches the students answer add 4 to the score
        if (array1[i] === array2[i]) {
            score += 4;
        }
        //if the student has an empty string for an answer, add nothing to the score
        else if (array2[i] === "") {
            score -= 0;
        }
        //if the student has an answer that is not correct and not an empty string, deduct 1 point from their score
        else {
            score -= 1;
        }
    }
    //if the score is a negative number (below 0), just return 0 as the score
    if (score < 0) {
        score = 0;
    }
    return score;
}