Which loop type is best for iterating over every element of a collection without using an index?

• A. For loop
• B. While loop
• C. Do-While loop
• D. For-Each loop

Answer: (D)

When you want to visit every element of a collection without worrying about its position, a for-each loop is designed for that. It automatically traverses the collection one element at a time and provides you with each value directly, so you don’t have to manage an index or bounds. This makes the code cleaner and less error-prone, since you’re not risking stepping beyond the end or skipping elements.

You can think of it as asking, “Give me the next element until there are no more.” The iteration is handled under the hood, usually via an iterator, and you simply perform your operation on each element as it’s provided.

If you needed the position of each item or to access elements by their numeric index, a different style that uses an explicit index would be more appropriate. A while loop would require you to manage the index and termination condition yourself, and a do-while loop would run at least once even if the collection is empty, which isn’t ideal for simple traversal.