Role-ordered prep · free
DSA prep for a frontend role
Frontend loops lean on arrays, strings and two-pointer work: 6 core topics, 84 of our 370 problems. Hard dynamic programming is rare. That is a materially smaller surface than a backend loop — grinding a generalist sheet top-to-bottom means spending weeks on segment trees your interview will never mention.
Learn these first
Core topics for a frontend loop — everything else waits until these hold.
- 1ArraysWalk through it →
- 2StringsWalk through it →
- 3Two PointersWalk through it →
- 4Sliding WindowWalk through it →
- 5RecursionWalk through it →
- 6SortingWalk through it →
Then these
Problems to start with
Named problems from this role's core topics, easiest first. Each page shows which roles treat it as core, which sheets carry it, and the companies that have asked it.
- Two Sum · Easy
- Maximum and Minimum Element in an Array · Easy
- Reverse the Array · Easy
- Contains Duplicate · Easy
- Chocolate Distribution Problem · Easy
- Best Time to Buy and Sell Stock · Easy
- Merge Sorted Arrays · Easy
- Pascal's Triangle · Easy
- Majority Element · Easy
- Sort an Array of 0s 1s and 2s · Easy
- Leaders in an Array · Easy
- Check if Array is Sorted and Rotated · Easy
What this ordering pushes down
Linked lists, binary trees, BSTs, graphs, dynamic programming, backtracking, heaps, bit manipulation, tries, binary search, greedy and math all sit below the core tier here. Twelve of the twenty-two topics, the largest deprioritised set of any role on this site, and the whole reason the ordering exists. It is still a ranking, not a guarantee: a tree question in a frontend loop usually arrives disguised as DOM traversal, and a trie arrives as autocomplete.
Why an order beats a list
Every popular sheet hands all 370 problems to everyone in the same fixed sequence. A frontend interview does not weight them the same way a backend interview does — so a fixed list spends your first weeks on topics your loop barely tests. Pick this role in the app and the same problems re-sequence: core topics first, the rest after.
Questions
How much DSA does a frontend interview need?
6 core topics — arrays, strings, two pointers, sliding window, recursion, sorting — covering 84 of our 370 problems. Heavy graph and DP rounds are uncommon for frontend.
Do frontend interviews ask dynamic programming?
Occasionally, but rarely the hard variety. It sits below the core tier here, so it's worth touching only after arrays, strings and the two-pointer family are solid.
Is DSA even needed for frontend jobs?
For product companies, yes — the coding round is largely the same format for every role. What changes is which topics carry weight, which is exactly what this ordering fixes.
Preparing for a different role?
19 more roles are available inside the app — pick yours on the Problems page.