Generate a random alphanumeric JavaScript string
Use JavaScript to generate a random alphanumeric string of a specified length.
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 · 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 two JavaScript objects have the same properties
Compare two objects to determine if the first one contains equivalent property values to the second one.
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JavaScript · Linear search in a JavaScript array
Use the linear search algorithm to find the first index of a given element in an array.
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JavaScript · Check if a JavaScript string is an anagram of another string
Check if a string is an anagram of another string, handling case-insensitivity and special characters.
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JavaScript · How can I calculate the greatest common divisor & least common multiple in JavaScript?
Use JavaScript to calculate the greatest common divisor and least common multiple of two or more numbers.
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JavaScript · Toggle fullscreen mode for an element using JavaScript
Did you know you can use JavaScript to toggle fullscreen mode for an element on a webpage? Let's learn how!
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JavaScript · Escape or unescape HTML using JavaScript
Learn how to convert text into HTML-safe strings and vice versa using JavaScript.
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JavaScript · What are JavaScript closures?
Learn and understand closures, a core concept in JavaScript programming, and level up your code.
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JavaScript · Cartesian product of two JavaScript arrays
Create a new array out of the two supplied by creating each possible pair from the arrays.
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HTML · Resource Preloading Cheat Sheet
Preloading content is one of many ways to improve your website's performance.
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CSS · Define a system font stack in CSS
Learn how to leverage the native fonts of the operating system to get close to a native app feel.
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React · React useTimeout hook
Implement
setTimeout()in a declarative manner, using a custom hook. -
React · Countdown timer
Create a countdown timer that prints a message when it reaches zero, using React.
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JavaScript · What are truthy and falsy values in JavaScript?
JavaScript uses type coercion in Boolean contexts, resulting in truthy or falsy values. Get a hang of how it all works in this quick guide.
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JavaScript · What is the difference between static and instance methods?
Static and instance methods are pretty easy to distinguish and serve different purposes. Learn all about them in this article.
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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 · How can I use JavaScript to reload the page?
Need to reload the current page using JavaScript? Here's the best way to do it, as well as some alternatives.
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JavaScript · Pluck values from and array of objects in JavaScript
Learn how to extract values from an array of objects based on a specified key.
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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 · Format a date to ISO string with timezone using JavaScript
Convert a date to extended ISO format (ISO 8601), including timezone offset.
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JavaScript · Can I validate an email address in JavaScript?
Email address validation can be much trickier than it sounds. Here's why and my advice on how to approach this problem.
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JavaScript · Command-line arguments in Node.js
Learn how to extract command-line arguments passed to a Node.js script.
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JavaScript · Truth check all values in a JavaScript array
Learn how to check if all values in an array are true or false.