Posted inCanvas and WebGL
How to draw a line on canvas in JavaScript
The HTML canvas element is a powerful feature that allows developers to draw graphics on…
Posted inLibraries: React
How to pass props to a component in React
React prop-types for advanced validation: arrayOf, shape, objectOf, element, node, and custom functions. A comparison of runtime prop-types checks versus compile-time static type checking with TypeScript for safer, self-documenting component props.
Posted inNode.js Core
How to access command-line arguments in Node.js
A Node.js command-line argument parser script for handling various formats: key-value pairs, boolean flags, single-dash flags (-v), combined flags (-xvf), and --key=value assignments. This JavaScript function processes process.argv and positional arguments, showing why yargs or commander are better.
Posted inCallbacks and Event Loop
How to pass a callback to another function in JavaScript
JavaScript's single-threaded nature can freeze the browser during long, synchronous tasks, causing unresponsiveness. Asynchronous programming, using setTimeout and Promises, prevents UI blocking. Promises allow chaining for cleaner code, while async/await provides a synchronous feel without blocking the main thread, ensuring smooth operation.
Posted inDOM Manipulation
How to select elements by class name in JavaScript
Efficiently manage DOM elements with event delegation and array methods like map, filter, and reduce. Avoid excessive event listeners by attaching a single listener to parent containers. Dynamically handle user interactions and optimize performance. Streamline calculations with reduce for cleaner code and improved maintainability.
Posted inAsynchronous JavaScript
How to delay execution using setTimeout in JavaScript
Manage complex asynchronous sequences in JavaScript with Promises and async/await syntax. Avoid callback hell and the pyramid of doom with flatter, more readable code. Utilize the delay function for streamlined execution. Enhance control flow without blocking the event loop, achieving intuitive task management. Optimize asynchronous programming practices efficiently.
Posted inNode.js Core
How to export a single function from a Node.js module
Single function exports in Node.js modules enhance code clarity and organization. Start with a single export for simplicity, then expand to multiple functions as needed. Avoid mixing export styles to prevent conflicts. Establish a consistent export approach for better collaboration and ease of use in your projects. Maintain clear boundaries in module design.
Posted inStandard Objects: Date
How to create a date object in JavaScript
JavaScript's new Date(dateString) is unreliable and causes bugs due to browser-dependent parsing. For consistent results, use the ISO 8601 format (YYYY-MM-DD). For ambiguous strings, parse manually and use the multi-argument new Date(year, month, day) constructor to prevent issues.
Posted inStandard Objects: RegExp
How to test a string with a regular expression in JavaScript
Common regex pitfalls: escaping special characters in new RegExp(), multiline 'm' flag for anchors ^ and $, character set rules for hyphen and negation, and catastrophic backtracking from nested quantifiers. Understanding these regex bugs prevents performance issues and invalid pattern errors.
Posted inLibraries: Three.js
How to render a cube using Three.js
Creating smooth animations in Three.js involves using the render loop with requestAnimationFrame. This method efficiently updates object states and renders the scene, ensuring synchronization with the display's refresh rate. The loop structure enables continuous updates, allowing for dynamic motion, like rotating objects, enhancing visual interactivity in real-time graphics applications.