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Abdullah Al Numan

Open source enthusiast and Front-end / Full-stack Developer with passion for React and Ruby on Rails

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In JavaScript, what's the difference between a variable that is: null, undefined and undeclared?
anewman15 profile

In JavaScript, what's the difference between a variable that is: null, undefined and undeclared?

#javascript #webdev #node #beginners
28
Comments 1
2 min read

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Explain why the following doesn't work as an IIFE: "function foo(){ }();". What needs to be changed to properly make it an IIFE?
anewman15 profile

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

#javascript #webdev #node #beginners
8
Comments 9
2 min read
Interview Question: Explain how `this` works in JavaScript [in 3 mins].
anewman15 profile

Interview Question: Explain how `this` works in JavaScript [in 3 mins].

#javascript #webdev #node #beginners
8
Comments 1
3 min read
What is NaN in JavaScript? What is its type? How can you reliably test if a value is equal to NaN?
anewman15 profile

What is NaN in JavaScript? What is its type? How can you reliably test if a value is equal to NaN?

#javascript #webdev #beginners #node
3
Comments 3
2 min read
What is the significance, and what are the benefits, of including 'use strict' at the beginning of a JavaScript source file?
anewman15 profile

What is the significance, and what are the benefits, of including 'use strict' at the beginning of a JavaScript source file?

#javascript #node #webdev #beginners
10
Comments 2
2 min read
What is the significance of, and reason for, wrapping the entire content of a JavaScript source file in a function block?
anewman15 profile

What is the significance of, and reason for, wrapping the entire content of a JavaScript source file in a function block?

#javascript #webdev #node #npm
11
Comments 3
1 min read
Explain CSS sprites, and how you would implement them on a page or site.
anewman15 profile

Explain CSS sprites, and how you would implement them on a page or site.

2
Comments
3 min read
What's the difference between an inline and inline-block element in CSS?
anewman15 profile

What's the difference between an inline and inline-block element in CSS?

#css #html #webdev #beginners
3
Comments 1
2 min read
What is the CSS display property and can you give a few examples of its use?
anewman15 profile

What is the CSS display property and can you give a few examples of its use?

#css #html #webdev #beginners
2
Comments
3 min read
Describe floats in CSS and how they work.
anewman15 profile

Describe floats in CSS and how they work.

#css #html #webdev #beginners
6
Comments 3
2 min read
What's the difference between a relative, fixed, absolute and statically positioned element?
anewman15 profile

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

#webdev #css #html #beginners
4
Comments
2 min read
Describe z-index and how stacking context is formed.
anewman15 profile

Describe z-index and how stacking context is formed.

#webdev #css #html #beginners
3
Comments
2 min read
What does * { box-sizing: border-box; } do? What are its advantages?
anewman15 profile

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

#webdev #css #html #beginners
10
Comments 1
1 min read
Explain your understanding of the Box Model and how you would implement different box models.
anewman15 profile

Explain your understanding of the Box Model and how you would implement different box models.

#css #html #webdev #beginners
8
Comments
2 min read
What is CSS selector specificity and how does it work?
anewman15 profile

What is CSS selector specificity and how does it work?

10
Comments
3 min read
Describe Block Formatting Context and how it works.
anewman15 profile

Describe Block Formatting Context and how it works.

#webdev #css #html #beginners
7
Comments 1
2 min read
What is Formatting Context in CSS? Describe a few types of Formatting Contexts.
anewman15 profile

What is Formatting Context in CSS? Describe a few types of Formatting Contexts.

#css #webdev #html #beginners
3
Comments
2 min read
What is render-blocking?
anewman15 profile

What is render-blocking?

4
Comments
1 min read
Describe the difference between <script>, <script async> and <script defer>
anewman15 profile

Describe the difference between <script>, <script async> and <script defer>

#javascript #html #webdev
10
Comments
1 min read
What is parser-blocking?
anewman15 profile

What is parser-blocking?

#javascript #html #webdev
4
Comments
1 min read
What are some advantages of using semantic HTML?
anewman15 profile

What are some advantages of using semantic HTML?

#html #webdev
6
Comments
1 min read
What is Semantic HTML?
anewman15 profile

What is Semantic HTML?

#webdev #html
3
Comments
2 min read
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