User Interface Expert Interview Questions And Answers

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Refine your UI Developer interview skills with our 90 critical questions. These questions will test your expertise and readiness for any UI Developer interview scenario. Ideal for candidates of all levels, this collection is a must-have for your study plan. Get the free PDF download to access all 90 questions and excel in your UI Developer interview. This comprehensive guide is essential for effective study and confidence building.

90 UI Developer Questions and Answers:

UI Developer Job Interview Questions Table of Contents:

UI Developer Job Interview Questions and Answers

1 :: How to check if a variable has NOT been set in PHP?

!isset($var);

2 :: Tell me why did you get into coding, programming, etc.?

"Because I can make good $," "I don't like to dress up or shave," and "because I loved the movie Hackers," are not good enough answers. Well… a comment about Hackers might fly but make sure you have a real backstory that describes your "Aha!" moment.

3 :: Tell me what is the current major version of Bootstrap?

3.x.x

4 :: What is the difference between HTML elements and tags?

HTML elements communicate to the browser how to render text. When surrounded by angular brackets <> they form HTML tags. For the most part, tags come in pairs and surround text.

5 :: Tell me what is a simple PHP method to make a cross domain data request?

file_get_contents().

6 :: Tell me how do you check if a variable has been set in PHP?

isset($var);

7 :: What does DOCTYPE mean?

The term DOCTYPE tells the browser which type of HTML is used on a webpage. In turn, the browsers use DOCTYPE to determine how to render a page. Failing to use DOCTYPE or using a wrong DOCTYPE may load your page in Quirks Mode.

See example:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">.

8 :: Tell me can jQuery be used to make an AJAX request?

Yes jQuery cab be used to make an AJAX request.

9 :: Tell us what is the difference between require() and include() when an error is encountered?

include() will raise a warning if it fails, require() will raise a fatal error.

10 :: Explain what's the difference between standards mode and quirks mode?

Quirks Mode is a default compatibility mode and may be different from browser to browser, which may result to a lack of consistency in appearance from browser to browser.

11 :: Is jQuery code exicuted on the clientside, or serverside?

Clientside

12 :: Tell me what elements have disappeared?

As mentioned above, <frame> and <frameset> have been eliminated. Other elements that are no longer supported include: <noframe>, <applet>, <bigcenter> and <basefront>.

13 :: Explain what are three ways to reduce page load time?

Reduce image sizes, remove unnecessary widgets, HTTP compression, put CSS at the top and script references at the bottom or in external files, reduce lookups, minimize redirects, caching, etc.

14 :: What programming language does jQuery use?

JavaScript

15 :: Explain what is the difference between SVG and <Canvas>?

<Canvas> is an element that manipulates two-dimensional (2D) pixels while Scalable Vector Graphics works in 2D and three-dimensional (3D) vectors. Essentially, <Canvas> is to SVG as Photoshop is to Illustrator.

16 :: How to include a comment in JavaScript?

/* This is a comment block */
//This is a commented out line

17 :: Tell me what is the difference between require() and include() when an error is encountered?

include() will raise a warning if it fails, require() will raise a fatal error.

18 :: Create an array in JavaScript with a list of 4 colors, assign that array to the variable, 'colors'?

var colors = ['red, 'yellow', 'green', 'blue'];

19 :: Tell me how do you select all elements with the class of "selected" in jQuery?

$('.selected');

20 :: Explain what is an AJAX request and what is a simple example of where a AJAX request would be used?

Asynchronous JavaScript and XML. Client side process used for GET, POST etc to get new data without having to refresh the page.

21 :: Explain what is the difference between the application model of HTML and HTML5?

Trick question, there is no difference. HTML5 is a continuum of HTML and just a souped up version of the original HTML. There has been no major paradigm shift.

22 :: Assign any variable name a value of "Hello World", and print that variable's contents to the console.?

var t = "Hello World";
console.log(t);

23 :: Tell me how do you install/use jQuery in a project. What is the minimum setup needed to start using jQuery?

script tag, linked to a jquery CDN or locally hosted file.

24 :: Explain Inside a php function, what param needs to be set in order to access a global variable?

function function_name(){
global $the_global_var;
}

25 :: What is the result of "20" + 20; in JS?

2020

90 UI Developer Interview Questions and Answers