#Front-end Course Questions

Table of Contents

1. General Questions
2. HTML Questions
3. CSS Questions
4. JS Questions
5. Network Questions
6. Coding Questions

General Questions:

• What did you learn yesterday/this week?

• What is a recent technical challenge you experienced and how did you solve it?

• Talk about your preferred development environment.

• Which version control systems are you familiar with?

• Can you describe your workflow when you create a web page?

• If you have 5 different stylesheets, how would you best integrate them into the site?

• Can you describe the difference between progressive enhancement and graceful degradation?

• Describe how you would create a simple slideshow page.

• Explain the importance of standards and standards bodies.

• Explain what ARIA and screenreaders are, and how to make a website accessible.

HTML Questions:

• What does a doctype do?

• What's the difference between standards mode and quirks mode?

• What kind of things must you be wary of when design or developing for multilingual sites?

• What are data- attributes good for?

• Consider HTML5 as an open web platform. What are the building blocks of HTML5?

• Describe the difference between a cookie, sessionStorage and localStorage.

CSS Questions:

• What is the difference between classes and ID's in CSS?

• What's the difference between "resetting" and "normalizing" CSS? Which would you choose, and why?

• Describe Floats and how they work.

• Describe z-index and how stacking context is formed.

• What are the various clearing techniques and which is appropriate for what context?

• How do you serve your pages for feature-constrained browsers?
  • What techniques/processes do you use?

• What are the different ways to visually hide content (and make it available only for screen readers)?

• Have you ever used a grid system, and if so, what do you prefer?

• Have you used or implemented media queries or mobile specific layouts/CSS?

• Any familiarity with styling SVG?

• How do you optimize your webpages for print?

• What are some of the "gotchas" for writing efficient CSS?

• What are the advantages/disadvantages of using CSS preprocessors?
  • Describe what you like and dislike about the CSS preprocessors you have used.

• How would you implement a web design comp that uses non-standard fonts?

• Explain how a browser determines what elements match a CSS selector.

• Explain your understanding of the box model and how you would tell the browser in CSS to render your layout in different box models.

• What does * { box-sizing: border-box; } do? What are its advantages?

• List as many values for the display property that you can remember.

• What's the difference between inline and inline-block?

• What's the difference between a relative, fixed, absolute and statically positioned element?

• The 'C' in CSS stands for Cascading. How is priority determined in assigning styles (a few examples)? How can you use this system to your advantage?

• Have you played around with the new CSS Flexbox or Grid specs?

• How is responsive design different from adaptive design?

• Have you ever worked with retina graphics? If so, when and what techniques did you use?

JS Questions:

• Explain event delegation

• Explain how this works in JavaScript

• Explain how prototypal inheritance works

• Explain why the following doesn't work as an IIFE (Immediately-invoked function expression): function foo(){ }();.
  • What needs to be changed to properly make it an IIFE?

• What's the difference between a variable that is: null, undefined or undeclared?
  • How would you go about checking for any of these states?

• What is a closure, and how/why would you use one?

• What's a typical use case for anonymous functions?

• How do you organize your code? (module pattern, classical inheritance?)

• What's the difference between host objects and native objects?

• Difference between: function Person(){}, var person = Person(), and var person = new Person()?

• What's the difference between .call and .apply?

• Explain Function.prototype.bind.

• What's the difference between feature detection, feature inference, and using the UA string?

• Describe event bubbling.

• Why is extending built in JavaScript objects not a good idea?

• Difference between document load event and document ready event?

• What is the difference between == and ===?

• Make this work:

duplicate([1,2,3,4,5]); // [1,2,3,4,5,1,2,3,4,5]

• Why is it called a Ternary expression, what does the word "Ternary" indicate?

• What is "use strict";? what are the advantages and disadvantages to using it?

• Create a for loop that iterates up to 100 while outputting "fizz" at multiples of 3, "buzz" at multiples of 5 and "fizzbuzz" at multiples of 3 and 5

• Why is it, in general, a good idea to leave the global scope of a website as-is and never touch it?

• Why would you use something like the load event? Does this event have disadvantages? Do you know any alternatives, and why would you use those?

Network Questions:

• Do your best to describe the process from the time you type in a website's URL to it finishing loading on your screen.

• Can you explain the difference between GET and POST?

Coding Questions:

Question: What is the value of foo?

var foo = 10 + '20';

Question: How would you make this work?

add(2, 5); // 7
add(2)(5); // 7

Question: What value is returned from the following statement?

"i'm a lasagna hog".split("").reverse().join("");

Question: What is the value of window.foo?

( window.foo || ( window.foo = "bar" ) );

Question: What is the outcome of the two alerts below?

var foo = "Hello";
(function() {
  var bar = " World";
  alert(foo + bar);
})();
alert(foo + bar);

Question: What is the value of foo.length?

var foo = [];
foo.push(1);
foo.push(2);