Pagination patterns in Node.js - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is pagination in web development?

Pagination is a way to split large sets of data into smaller chunks or pages to make it easier to load and view.

intermediate

What is the difference between offset-based and cursor-based pagination?

Offset-based pagination uses page numbers and skips records, while cursor-based pagination uses a unique value (cursor) to fetch the next set of results, making it more efficient for large or changing data.

intermediate

Why is cursor-based pagination often preferred for APIs?

Cursor-based pagination avoids issues with data changes during paging and is faster because it uses a stable reference point instead of counting rows.

beginner

Show a simple Node.js example of offset-based pagination using an array.

const data = [...];
const page = 2;
const limit = 5;
const start = (page - 1) * limit;
const pagedData = data.slice(start, start + limit);
// pagedData contains items for page 2

intermediate

What are common challenges when implementing pagination?

Handling data changes between pages, ensuring consistent order, managing performance with large datasets, and providing good user experience with navigation controls.

Which pagination method uses a unique value to fetch the next page?

A Page number pagination

B Offset-based pagination

C Cursor-based pagination

D Limit-based pagination

Cursor-based pagination uses a unique cursor value to get the next set of results.

In offset-based pagination, what does the offset represent?

A The number of items to skip

B The total number of pages

C The unique ID of the last item

D The size of each page

Offset is how many items to skip before starting to collect the page data.

Why might offset-based pagination cause problems with changing data?

A Because it uses cursors

B Because data can be added or removed, shifting offsets

C Because it loads all data at once

D Because it requires complex queries

If data changes, the offset may point to different items, causing duplicates or missing data.

Which Node.js method is commonly used to get a slice of an array for pagination?

A slice()

B splice()

C map()

D filter()

slice() returns a portion of the array without modifying the original.

What is a key benefit of cursor-based pagination in APIs?

A It loads all data at once

B It uses page numbers

C It requires less code

D It handles data changes gracefully

Cursor-based pagination uses stable references, so it works well even if data changes.

Explain how offset-based pagination works and when it might cause issues.

Think about skipping items and how new data can shift pages.

Describe cursor-based pagination and why it is useful for APIs dealing with large or changing datasets.

Imagine a bookmark that remembers where you left off.