What is the Event Loop in JavaScript?
The Event Loop is a source of confusion for many developers, but it's a fundamental piece of the JavaScript engine.
Code Articles
30 seconds of code contains a curated collection of code articles covering a wide range of development needs. The collection spans many topics, ranging from simple coding problems to theoretical concepts and development techniques.
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JavaScript · -
JavaScript · How can I detect an undefined object property in JavaScript?
Learn how to detect
undefinedobject properties in JavaScript the correct way. -
JavaScript · Pretty-print a JSON object with JavaScript
Pretty-printing JSON objects in pretty easy and customizable in JavaScript. Here's the gist of it.
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JavaScript · Check if a string contains a substring in JavaScript
Let's have a look at how to check if a string contains a substring in JavaScript.
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JavaScript · What does the double negation operator do in JavaScript?
You've probably come across the double negation operator (
!!) before, but do you know what it does? -
JavaScript · How can I iterate over nested iterables in JavaScript?
Ever wanted to iterate over nested iterables in JavaScript? Here's how.
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JavaScript · How can I add a key-value pair to a JavaScript object?
Adding a key-value pair to a JavaScript object is straightforward, yet there are multiple ways available to do so.
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JavaScript · Compare strings regardless of case and accent
Here's a quick tip on how to compare and sort arrays of strings, ignoring case and accents.
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JavaScript · Append elements to a JavaScript array
Have you ever tried appending elements to an array in JavaScript? Here's a primer on all the available options.
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JavaScript · Replace all occurrences of a string in JavaScript
If you need to replace all occurrences of a string in JavaScript, you have a couple of options.
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JavaScript · Remove an element from a JavaScript array
Did you know there are multiple ways to remove an element from an array? Let's take a look.
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JavaScript · Using random values with pure functions
Randomness and pure functions don't seem to go hand in hand. But where there's a will, there's a way.
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React · Prefer primitives in useEffect dependencies
Avoid unnecessary re-runs by using primitive dependencies in your React effect.
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JavaScript · Create a static file server with Node.js
Create your own static file server with Node.js in just 70 lines of code.
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JavaScript · Creating HTML elements in JavaScript
Learn how to create HTML elements in JavaScript, by abstracting the creation logic into a function.
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Web development · Escaping tutorial hell
Many beginners get stuck in tutorial hell without even realizing. Here are 4 simple ways to escape tutorial hell and get back to learning.
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CSS · What's the difference between :root and html in CSS?
The CSS selectors used to target the root element of an HTML share some similarities, but they also have some differences.
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JavaScript · Are JavaScript closures inherently evil?
Closures are used frequently, yet often misunderstood. Understanding them in depth is crucial to be able to write clean, maintainable code.
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JavaScript · Abort a fetch request in JavaScript
Aborting a fetch request in JavaScript is a common problem. Here's how to handle it correctly.
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JavaScript · 3 ways to use the JavaScript spread operator with arrays
JavaScript's spread operator is a very versatile tool. Here are some simple ways to use it.
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JavaScript · Immutable JavaScript objects using the Proxy object
Freezing objects is not the only way to prevent mutations. Learn how you can leverage the Proxy object to your advantage.
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CSS · Perfect nested border radius in CSS
Nesting elements with rounded borders can look very wrong if not done correctly. Here's a quick tip on how to do it right.
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JavaScript · Mocking global object methods in Jest
Testing your code is important, but mocking can be tricky at times. Here's a quick guide on how to mock global object methods in Jest.
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JavaScript · Faster element removal in unordered JavaScript arrays
Are you performing a lot of array operations? Maybe element removal is a performance bottleneck you can avoid.