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.
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 · How can I split a JavaScript array into two groups?
Learn how to split a JavaScript array into two groups based on a function or an array of values.
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JavaScript · How can I add a timeout to a promise in JavaScript?
Oftentimes you might need to add a timeout to a promise in JavaScript. Learn how to do this and more in this short guide.
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JavaScript · Asynchronous function composition in JavaScript
Learn how to perform function composition for asynchronous functions.
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JavaScript · How do I compare two arrays in JavaScript?
Learn how you can compare two arrays in JavaScript using various different techniques.
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JavaScript · How can I add minutes, hours or days to a JavaScript date?
Learn how to manipulate
Dateobjects to add minutes, hours, days and more. -
CSS · Isometric card
Learn how to create an isometric card using CSS.
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React · Force a React component to re-render
Ever wanted to force update a React component? Here's a custom hook that does just that.
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React · React useIntersectionObserver hook
Observe visibility changes for a given element, using the
IntersectionObserverAPI. -
JavaScript · Swapcase a JavaScript string
Learn how to create a string with uppercase characters converted to lowercase and vice versa.
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JavaScript · What are promises in JavaScript? In which states can a promise be?
JavaScript's promises represent the eventual completion (or failure) of asynchronous operations and their resulting value.
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JavaScript · Use JavaScript to listen and handle scroll stop events
Use some clever JavaScript tricks to listen for and handle scroll stop events in the browser.
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JavaScript · How can I save a JSON object to a file using JavaScript?
Learn how to write a JSON object to a file, both using Node.js and in the browser.
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JavaScript · Join the segments of a URL using JavaScript
Learn how to join the segments of a URL and normalize the resulting URL using JavaScript.
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JavaScript · Invert the key-value pairs of a JavaScript object
Learn how to invert the key-value pairs of an object in JavaScript.
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JavaScript · Filter a JavaScript object's properties by keys or values
Learn how to transform objects by filtering their properties based on an array of keys or a predicate function.
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JavaScript · Calculate the factorial of a number using JavaScript
Calculate the factorial of a number, using two different approaches.
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JavaScript · How can I extend a 3-digit color code to a 6-digit color code in JavaScript?
Learn how to convert a 3-digit RGB notated hexadecimal color-code to the 6-digit form.
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JavaScript · Can I create dynamic setters and getters in JavaScript?
Using the Proxy object, we can create dynamic getters and setters for objects in JavaScript.
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JavaScript · Assign default values for a JavaScript object's properties
Assign default values for all properties in an object that are
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JavaScript · Count the occurrences of a value in a JavaScript array or string
Given a value, find out how many times it appears in an array or string.
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JavaScript · Common regular expressions
A collection of regular expressions that can be used to solve common problems.
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JavaScript · How can I check for a blank value in JavaScript?
JavaScript doesn't have a built-in way to check if a value is blank, but it's easy to create one.
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JavaScript · What is the difference between Array.prototype.map() and Array.prototype.forEach()?
Which method do you reach for first? What are the differences between them? Let's find out!