computeResult.js

module.exports = (answers, studentAns) => {
	if (answers.length !== studentAns.length) {
		return 'Arrays must be of the same length';
	}
	let sum = 0;
	for (let i = 0; i < answers.length; i++) {
		if (answers[i] === studentAns[i]) {
			sum += 4;
		} else if (studentAns[i] !== ' ') {
			sum -= 1;
		}
	}
	sum = sum < 0 ? 0 : sum;
	return sum;
};

A function that computes results given two arrays, an answer array, and a student answer array