// Initialize a jagged array
let studentGrades = [
[80, 85, 90], // Prompt grades
[75, 88], // Science Fiction grades
[97, 82, 86, 97], // Math grades
[90, 99, 93, 100] // Computer Science grades
];
// Calculate the average grade for each subject
const studentGrades_length = studentGrades.length;
for (let i = 0; i < studentGrades_length; i++) {
let sum = 0;
const studentGrades_i_length = studentGrades[i].length;
for (let j = 0; j < studentGrades_i_length; j++) {
sum += studentGrades[i][j];
}
let average = sum / studentGrades_i_length;
console.log(`Average grade for subject ${i + 1}: ${average}`);
}
/*
run:
Average grade for subject 1: 85
Average grade for subject 2: 81.5
Average grade for subject 3: 90.5
Average grade for subject 4: 95.5
*/
