Posted inStandard Objects: RegExp
How to create a regular expression in JavaScript
Master regular expressions in JavaScript to validate and manipulate strings. Learn syntax, anchors, quantifiers, and advanced matching techniques.
Posted inTesting Frameworks
How to write your first test in JavaScript
Pragmatic software testing strategy focusing on boundaries and edge cases over 100% code coverage. Test the happy path, then find real bugs in tricky spots for code confidence. Includes examples like a string truncation function.
Posted inPromises and Async-Await
How to reject a promise in JavaScript
Avoid the cardinal sin of error handling in JavaScript: throwing strings. Instead, use `throw new Error()` for better debugging. Strings lack context, leading to confusion and ineffective logging. An `Error` object provides essential properties like `message` and `stack`, crucial for tracking issues. Prioritize clean, professional coding practices.
Posted inCode Quality: ESLint/Prettier
How to configure ESLint rules
ESLint configuration using the `extends` property to inherit a recommended base ruleset like `eslint:recommended`. Build on a shared community standard, a sane foundation for project-specific rules. This strategic choice catches common bugs and errors, avoiding a ruleset built from scratch.
Posted inFetch API and AJAX
How to make a GET request with fetch in JavaScript
Optimize your JavaScript network requests with a custom `apiFetch` function. Simplify error handling, response parsing, and logging in one reusable wrapper. Incorporate `async/await` for cleaner code and implement `AbortController` for timeout management. Avoid repetitive boilerplate and enhance application reliability seamlessly.
Posted inEvent Handling
How to add a click event listener in JavaScript
Efficient click event management in complex applications requires robust patterns like event delegation, which reduces active listeners and enhances performance. Essential practices include diligent cleanup of listeners to prevent memory leaks, using debouncing to optimize heavy operations, and ensuring accessibility for keyboard navigation.
Posted inLibraries: React
How to create a React component
High-quality reusable components are defined by purity, clarity, robustness, and generalization. Discover best practices for component design and testing.
Posted inObjects and Prototypes
How to create an object in JavaScript
In JavaScript, object literals provide a convenient way to create objects using a simple syntax.…
Posted inUnit Testing: Jest
How to install and configure Jest
Optimize testing performance with test doubles to isolate code from slow dependencies. Identify "seams" in your application for efficient behavior alteration. Use mock implementations to eliminate delays caused by database queries, enhancing the speed and reliability of unit tests. Balance isolation and integration testing for effective results.
Posted inCallbacks and Event Loop
How to define a callback function in JavaScript
Asynchronous JavaScript operations rely heavily on callbacks, especially in single-threaded environments. Callbacks enable non-blocking execution during tasks like network requests and file reading. However, nested callbacks can lead to "callback hell." Promises and async/await provide clearer, more manageable code structures, simplifying error handling and improving readability.