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Google front end interview questions

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Front End Interview Handbook is now part of GreatFrontEnd! We are working to migrate the content over and you may find the latest version of this page on GreatFrontEnd.

Since it's Google, candidates can expect to be tested on fundamental Computer Science concepts as well as their front end knowledge/skills.

Web Front End: ​You should be ready to cover topics like front end latency and implementation of standard CS algorithms using idiomatic JavaScript. You should be able to articulate Javascript strengths and shortcomings and ready to cover any of the following: Web security issues (XSS, XSRF), Prototypal inheritance, DOM API & manipulation, CSS manipulation, Browser / DOM events & event handling, XHR requests & HTTP headers, JavaScript closures

Refer to the full official Google Interview Preparation Guide for Front End Software Engineer.

JavaScript

User interface coding

  • Design a slider component.
  • Design a Tic-Tac-Toe game/design an algorithm for Tic-Tac-Toe game.
  • Implement nested checkboxes (when the parent is checked, children are checked and vice versa. Use <input type="checkbox">). Similar to Indeterminate checkboxes.
  • Design a webpage which can auto load new posts when you reach the bottom of the page by using JavaScript. You may use AJAX and JavaScript event listeners.
  • Write a UI using HTML, CSS, JavaScript that allows uses to enter the number of rows and columns in text input fields within a form and renders a table.
    • Practice question on GreatFrontEnd (Paid)
    • Example: Number of rows: 4, Number of columns: 5, "Submit" button. Clicking on the "Submit" button will show the following table (ignore the styling):
1891617
27101518
36111419
45121320

Trivia

  • Explain the CSS Box Model.
  • What happens when you type a URL into the browser and hits enter?
  • Given some text on a web page, how many ways can you make the text disappear?
  • How do you send data from a web page to a server without a page refresh?

System design

Algorithm

  • Minesweeper problem. Write a function reveal() that outputs the number of tiles shown when a user clicks on a tile. Each tile shows the number of bombs as its neighbor. If the user click on a tile that is a bomb, the game is over. If that tile is 0, reveal all its neighbors.
  • You are given four numbers (type int), and have four basic math operators at your disposal (+, -, x, /). Given arbitrary ways to group the numbers and using any of the operators, determine if you can make the number 24 from the four numbers. The numbers must be processed in the order they appear.
  • Find k-nearest points.

Source: Glassdoor Google Front End Software Engineer Interview Questions, Google | Front End engineer