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Check-the-exam.js
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Check-the-exam.js
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/* 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
*/
// solution
const checkExam = (array1, array2) => {
let result = array2.reduce(
(score, answer, i) => {
if(answer == array1[i]) return score += 4;
else if(answer == 0) return score += 0;
else return score - 1;
}
, 0);
return result < 0 ? 0 : result;
}