Pagination with limit and offset in Rest API - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

What is the output of this pagination API call?

Consider an API endpoint that returns a list of items with pagination using limit and offset query parameters. The data source contains 10 items labeled from 1 to 10.

The API call is: GET /items?limit=3&offset=4

What list of item IDs will the API return?

Rest API

items = list(range(1, 11))
limit = 3
offset = 4
result = items[offset:offset+limit]
print(result)

A [4, 5, 6]

B [5, 6, 7]

C [6, 7, 8]

D [3, 4, 5]

💡 Hint

Remember that list indexing in Python starts at 0, so offset 4 means the 5th item.

The offset 4 means start from the 5th item (index 4). With limit 3, the API returns items at indices 4, 5, and 6, which are 5, 6, and 7.

🧠 Conceptual

intermediate

Which statement about limit and offset pagination is true?

Choose the correct statement about using limit and offset for pagination in REST APIs.

A Offset and limit are interchangeable and mean the same thing.

B Limit specifies the starting item index, and offset specifies the number of items to return.

C Offset specifies how many items to skip, and limit specifies how many items to return.

D Limit specifies the total number of items in the data source.

💡 Hint

Think about how you would get the next page of results.

Offset tells the API how many items to skip before starting to return results. Limit tells how many items to return after skipping.

🔧 Debug

advanced

Why does this pagination code return an empty list?

Given the following code snippet for pagination, why does it return an empty list?

Rest API

items = list(range(1, 21))
limit = 5
offset = 20
result = items[offset:offset+limit]
print(result)

A Because offset is equal to the length of the list, so slicing starts beyond the last item.

B Because limit is too small to return any items.

C Because the list is empty.

D Because offset and limit are swapped in the slice.

💡 Hint

Check the length of the list and the value of offset.

The list has 20 items indexed 0 to 19. Offset 20 means start slicing at index 20, which is beyond the last item, so the slice returns an empty list.

📝 Syntax

advanced

Which option correctly implements pagination with limit and offset in Python?

Choose the code snippet that correctly returns a paginated list of items using limit and offset.

A result = items[offset:offset+limit]

B result = items[limit:offset+limit]

C result = items[offset-limit:offset]

D result = items[limit-offset:limit]

💡 Hint

Remember slicing syntax is list[start:end] where start is inclusive and end is exclusive.

To get items starting at offset and up to limit items, slice from offset to offset+limit.

🚀 Application

expert

How many items will be returned by this paginated API call?

An API has 15 items. A client requests GET /items?limit=7&offset=10. How many items will the API return?

A 0

B 7

C 10

D 5

💡 Hint

Calculate how many items remain after skipping the offset.

Offset 10 skips the first 10 items, leaving 5 items (15 - 10). Limit 7 means up to 7 items can be returned, but only 5 remain, so 5 items are returned.