---
title: ByteDance/TikTok Front End Interview Questions
sidebar_label: ByteDance/TikTok interview questions
---

:::info Latest version on GreatFrontEnd

Find the latest version of this page on [GreatFrontEnd's ByteDance Front End Interview Guide](https://www.greatfrontend.com/interviews/company/bytedance/questions-guides?utm_source=frontendinterviewhandbook&utm_medium=referral&gnrs=frontendinterviewhandbook).

:::

ByteDance/TikTok's front end interview is quite balanced in terms of interview format.

## JavaScript coding questions

- Implement `Promise.all`.
  - [Practice question](https://www.greatfrontend.com/questions/javascript/promise-all?utm_source=frontendinterviewhandbook&utm_medium=referral&gnrs=frontendinterviewhandbook) (Free)
- Implement a function which extends `Array.prototype`.
  - [Practice questions](https://www.greatfrontend.com/questions?utm_source=frontendinterviewhandbook&utm_medium=referral&gnrs=frontendinterviewhandbook)

## User interface coding questions

- Implement a dropdown component.
  - [Read answer](https://www.greatfrontend.com/questions/system-design/dropdown-menu?utm_source=frontendinterviewhandbook&utm_medium=referral&gnrs=frontendinterviewhandbook) (Paid)

## Quiz questions

- Difference between `localStorage` and cookies.
  - [Read answer](https://www.greatfrontend.com/questions/quiz/describe-the-difference-between-a-cookie-sessionstorage-and-localstorage?utm_source=frontendinterviewhandbook&utm_medium=referral&gnrs=frontendinterviewhandbook) (Free)

## Algorithm

- Merge two sorted integer arrays, remove duplicates.
- You have an image on a page, write css and js so that when mouse is over the image, it rotates 180 deg with 1 sec animation.
- Given a list of points, find out if any four of them form a square. Return 'true' if possible, else 'false'.
  - Examples: `[[0, 0], [2, 0], [1, 1], [0, -1], [-1, -1], [0, 2], [0, 1], [1,0]]` -> `true`
- Check for balanced brackets in a string.
- Given two nodes, return the section of the tree between these two nodes.
- Find the islands in a grid of land and sea.

_Source: [Glassdoor ByteDance Front End Developer Interview Questions](https://www.glassdoor.sg/Interview/ByteDance-Front-End-Developer-Interview-Questions-EI_IE1624196.0,9_KO10,29.htm)_