Front-end developer interview questions

frontend
peirix picture peirix · May 19, 2010 · Viewed 77k times · Source

There are a lot of good interview questions (even "puzzles") for software developers here in Stack Overflow and other places, but I was wondering if anyone had some good questions for a front-end developer position. We're looking for someone who knows HTML+CSS+JS.

Some of the obvious questions:

  • Have you worked with Javascript libraries? - follow-up: which, and why that one over others?
  • Are you following the development of HTML5 and CSS3? - follow-up: Which features are you looking forward to the most, and why?

Do you know any good "puzzles" for a front-end developer? Maybe a JS fizz-buzz?

edit: changed the two questions to be a bit more open.

Answer

ground5hark picture ground5hark · May 19, 2010

It depends on the level you are interviewing for. I recently finished up a good round of interviews for frontend positions (and found a good job! ;), here are some of the questions I was asked which I thought stood out (and were more challenging than others).

  • Explain the difference between the JavaScript call and apply functions.

  • Puzzle: Emulate the game "Secret Santa" where there are 3 or more participants, no participant can receive their own gift or receive more than one gift. Do this in JavaScript.

  • Identify two ways in which you can clear a floated element with HTML/CSS.

  • What is the difference between event bubbling and event capture?

  • Describe a rendering problem you had in IE6 or IE7, and how you overcame it.

  • Define the term 'closure' and give an example of it in JavaScript.

  • Explain the differences between the IE and DOM standard event model.

  • What is the proper way to evaluate JSON from the server, and why is this the proper way?

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