ByteDance/TikTok front end interview questions

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

JavaScript

• Implement Promise.all.
  • Practice question on GreatFrontEnd
• Implement a function which extends Array.prototype.
  • Practice questions on GreatFrontEnd

User interface coding

• Implement a dropdown component.
  • Read answer on GreatFrontEnd (Paid)

Trivia

• Difference between localStorage and cookies.
  • Read answer on GreatFrontEnd

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