I'm learning javascript; I'm confused about when to use 'return.' So far I know 'return' is used either to specify exactly what value to return or to stop a function from running.

But, when comparing my solution to the answer key, its function required a return statement, but mine did not. Yet, both displayed the same results on the console. Why? Are the results actually different?

Problem: "Using a WHILE loop, calculate the percentage of students' test scores stored in the testScore array. The test has a total of 50. Store the percentages in another array and display it to the console."

My Solution:

const testScore = [10, 40, 30, 25];
const percentages = [];

const gradePercentage = (scores) => {
  const perc = (scores / 50) * 100;
  percentages.push(perc);
};

let i = 0;
while (i < testScore.length) {
  gradePercentage(testScore[i]);
  i++;
}
console.log(percentages);

Answer Key

const testScore = [10, 40, 30, 25];
const percentages = [];

const gradePercentage = (scores) => {
  return (scores / 50) * 100;
};

let i = 0;
while (i < testScore.length) {
  const perc = gradePercentage(testScore[i]);
  percentages.push(perc); 
  i++;
}
console.log(percentages); 

Both displayed this result: