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The Most Common Technical Questions for HYF Graduates

Here a list of the most common technical questions we’ve seen separated per module. Be sure you can answer all of them upon graduation and also illustrate with examples whenever possible.

HTML

  • What is HTML?
  • What are the 2 main components of an HTML document? What is the purpose of each?
  • Can you name 2 differences between classes and ids?
  • What is “semantic HTML”?
  • Can you tell the difference between internal and external links?
  • Can you name one use case for the <iframe /> tag?
  • What is the DOM?

More HTML resources:

CSS

  • What is CSS?
  • Name and explain the 3 different ways of injecting CSS into a HTML document.
  • What is the meaning of the C (cascading) in CSS?
  • Explain the “box model”.
  • What is your favourite CSS framework and why?
  • Give 2 reasons why you would use a CSS framework over custom CSS.
  • What is flexbox?
  • How do CSS variables work?
  • What are pseudo-classes? Give 2 examples.
  • How can you make a webpage “responsive”?

More CSS resources:

Javascript

  • Using JavaScript, how do we insert text into an HTML <div> element with an “id” of “target"?
  • Name two ways of accessing “properties” on an object
  • What is “asynchronicity” and what’s one way in JavaScript how we can introduce it into our application?
  • What is AJAX?
  • Can you tell the difference between Promises and await/async?
  • How do Promises relate to callbacks?
  • What are closures? What’s their purpose?
  • What are the common methods to select DOM elements with?
  • How does the event loop work?
  • What is an anonymous function?
  • What is the “window” object?
  • How does form validation work?

More JS resources:

Node.js

  • What is REST?
  • Describe the client-server model
  • What is an API?
  • Name some commonly used HTTP methods. What they are used for?
  • In which data format is do client requests come?
  • What’s an endpoint?
  • How do you know if a web server is running?
  • What is CORS?

MySQL

  • What is MySQL?
  • Explain the difference between SQL and MySQL
  • What is meant by “relational” database?
  • Could you give an example of a database entity and how it could be expressed in a table?

React

  • What is React.js?
  • Name 2 important core concepts within React.
  • How does state management work within React?
  • What is “component lifecycle”?
  • How are click events handled?
  • What is prop drilling?

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