JavaScript's numeric separators explained
Numeric separators are a somewhat lesser-known JavaScript syntactic sugar that can make working with large constants a lot easier.
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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HTML · Create a descending list of numbered items in HTML
Did you know there's an easy way to create a descending list of numbered items with pure HTML? Learn how with this handy tip.
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JavaScript · Prevent a string from being escaped in JavaScript
Strings in JavaScript can be escaped in various ways. But how do you prevent a string from being escaped? Here's a handy trick for that.
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JavaScript · What is an IIFE in JavaScript?
An Immediately Invoked Function Expression (IIFE) is a JavaScript trick that trips up many developers. Here's what you need to know.
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JavaScript · Code Anatomy - For loops, array reduce and method chaining
There are many ways to iterate and transform array data in JavaScript. Learn how each one works and where you should use them.
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JavaScript · Can I use an arrow function as the callback for an event listener in JavaScript?
Learn the differences between JavaScript ES6 arrow functions and regular functions and how they affect event listener callbacks.
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JavaScript · How can I clone an array in JavaScript?
Pick up a few new tricks which you can use to clone arrays in JavaScript.
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JavaScript · How do I convert an iterable to an array in JavaScript?
Learn how to use the JavaScript ES6 spread syntax to converting iterables to arrays and level up your code today.
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JavaScript · Asynchronous array loops in JavaScript
Asynchronously looping over arrays in JavaScript comes with a few caveats you should watch out for.
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JavaScript · JavaScript console.log() tips & tricks
Level up your JavaScript logging with these
console.log()tips and tricks. -
JavaScript · What is the difference between JavaScript's for...in, for...of and forEach?
Learn the differences between the three most commonly used iteration methods in JavaScript, that often confuse beginners and veterans alike.
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JavaScript · How can I define an enum in JavaScript?
Enums are part of TypeScript, but what about defining enums in plain old JavaScript? Here are a few way you can do that.
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JavaScript · 4 JavaScript Array methods you must know
JavaScript arrays have a very robust API offering some amazing tools. Learn the 4 must-know JavaScript array methods in this quick guide.
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JavaScript · Understanding the "this" keyword in JavaScript
JavaScript's
thiskeyword can confuse beginners and veterans alike. Learn how it works in different scenarios and start using it correctly. -
JavaScript · Asynchronous JavaScript Cheat Sheet
Learn everything you need to know about promises and asynchronous JavaScript with this handy cheatsheet.
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JavaScript · Understanding event bubbling, capturing and delegation in JavaScript
Understand how events work in JavaScript and learn when to use event bubbling, event capturing and event delegation with this short guide.
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JavaScript · You can get the value of an input element as a number
Ever wanted to get the value of an HTML input element as a number? Learn an easy way to do it with this handy trick.
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JavaScript · Make any JavaScript value iterable
Did you know you can define an iterator for any JavaScript value? This quick tip will show you how.
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JavaScript · Introduction to arrow functions in JavaScript
JavaScript arrow functions are a very useful tool to learn and master. Here's a complete introduction to everything you need to know.
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React · Writing readable reducers in Redux
When working with stateful code, you can run into issues realted to complexity and readability. Oftentimes, they are easily fixable.
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JavaScript · How can I detect if Caps Lock is on with JavaScript?
If you need to check if Caps Lock is on when the user is typing in the browser, JavaScript's got you covered.
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HTML · 8 tips for accessible websites
Accessibility (a11y) can improve your website and attract new users. Learn how to get started with these 8 quick tips.
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JavaScript · Refactoring your for...in loops to avoid ESLint warnings
ESLint is a really useful tool, but sometimes it gets in the way. Learn how to refactor code to get rid of a common warning.
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JavaScript · Where and how can I use the Boolean function in JavaScript?
JavaScript's Boolean function can be used for truth-checking data among other things. Learn how to use it and level up your code today.