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Javascript
Itsfoss
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How I Run JavaScript in VS Code
- Running JavaScript in Visual Studio Code (VS Code) is essential for modern web development to bring in interactivity.
- Two main approaches for running JavaScript in VS Code are using Node.js directly in the editor and running it in a browser or using extensions for quick testing or visual feedback.
- Node.js brings the V8 engine to local machines, allowing JavaScript to run outside the browser, useful for backend work, automation scripts, and quick testing without the need for an HTML shell.
- To set up a JavaScript project in VS Code, install Node.js, create a project folder, initialize a basic project with npm, create a JavaScript file, and run it using 'node app.js' in the terminal. Alternatively, use the Code Runner extension for quick snippet executions.
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Dev
3w
357
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Best Way to Learn TypeScript & JavaScript for Playwright in Test Automation
- Mahesh, a career changer from chef to IT, is new to programming and currently working in test automation using Playwright for UI testing.
- He aims to learn TypeScript/JavaScript to enhance his automation skills by writing clean test code, handling async operations, and understanding best practices for Playwright.
- Mahesh faces challenges with debugging due to timing issues, flaky selectors, and unexpected behaviors and seeks to improve his debugging skills.
- Mahesh is looking for the best learning resources for TypeScript and JavaScript, Playwright-specific tutorials, debugging techniques and tools, and ways to bridge the gap between using Playwright at work and understanding the framework deeply.
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Dev
3w
221
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Daily JavaScript Challenge #JS-193: Calculate Fibonacci Number Using Dynamic Programming
- Today's JavaScript challenge focuses on calculating the Fibonacci number using dynamic programming.
- Developers are encouraged to implement a function for finding the N-th Fibonacci number efficiently through dynamic programming.
- The challenge is of medium difficulty level and falls under the category of Dynamic Programming.
- Further resources and documentation on Fibonacci numbers and dynamic programming techniques are provided for additional learning.
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Dev
3w
265
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V8 Engine, JavaScript APIs, and XMLHttpRequest (XHR)
- JavaScript relies on powerful engines and interfaces like the V8 engine, JavaScript APIs, and the XMLHttpRequest (XHR) object in host environments.
- The V8 engine, developed by Google, compiles and executes JavaScript code, including features like JIT compilation and garbage collection.
- JavaScript APIs provided by host environments like web browsers offer functionalities such as DOM manipulation, timers, networking, and storage.
- XMLHttpRequest (XHR) is a browser API that enables asynchronous HTTP requests, with modern alternatives like the fetch() API also gaining popularity.
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Dev
3w
260
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JavaScript Hoisting + Temporal Dead Zone made easy
- JavaScript hoisting involves moving variable and function declarations to the top of their scope.
- When using var, the variable is hoisted and initialized as undefined.
- Variables declared with let and const are also hoisted but kept in the Temporal Dead Zone (TDZ).
- TDZ is the time between when the scope starts and when the variable is declared, where you can't access the variable.
- Function declarations are fully hoisted, allowing them to be called before declaration.
- Function expressions like arrow functions follow TDZ rules and can cause errors if accessed before declaration.
- Best practices include declaring variables at the top, using let and const over var, and structuring code to read top-down.
- Using linters like ESLint can help catch TDZ bugs, and thinking of hoisting as JavaScript's pre-processing stage can aid in understanding behavior.
- Understanding hoisting and TDZ can prevent unexpected errors and improve code quality in JavaScript.
- Remembering the rules of hoisting and TDZ can make your code more predictable and easier to debug.
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Hackernoon
3w
296
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Mastering Asynchronous JavaScript Callbacks, Promises, and Async, Await for Cleaner React Components
- Asynchronous JavaScript is crucial in React for handling delays and ensuring a smooth user experience.
- Callbacks were the original way to manage async logic before Promises and async/await.
- Callbacks involve passing functions into other functions to be executed later, leading to callback hell with deeply nested functions.
- Promises provide a cleaner way to handle async code, featuring states like pending, fulfilled, and rejected, allowing for chaining with .then() and error handling with .catch().
- Async/await simplifies async coding, making it read like synchronous code, using await to pause a function until a Promise resolves and try/catch for error handling.
- Best practices for using async logic in React components include avoiding using async directly in useEffect, cleaning up async calls on unmount, and utilizing useEffect for async side effects.
- Real-world examples showcase handling API requests with fetch(), managing loading states and errors, and ensuring cleanup of side effects.
- Key takeaways include handling loading and errors, using AbortController to prevent side effects, and wrapping API calls in try-catch-finally for reliable code.
- The importance of showing loading and error states, cleaning up requests, and writing fetch logic that works is highlighted in the key takeaways.
- Writing clean async logic in React involves focusing on basics like handling loading, error states, and cleanup to ensure a reliable UI.
- Starting with plain fetch(), understanding the problem, and solving it cleanly can lead to good code, and additional tools can be used as complexity grows.
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Dev
3w
163
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Daily JavaScript Challenge #JS-192: Determine if a String Has All Unique Characters
- Daily JavaScript Challenge: Determine if a String Has All Unique Characters
- The challenge involves writing a function to determine if all characters in a given string are unique.
- The function should return true if all characters are unique and false otherwise, and it is case-sensitive.
- Developers are encouraged to fork the challenge, write their solution, and share their approach in the comments section.
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Dev
4w
146
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Advanced Techniques in JavaScript Debugging with Node Inspector
- Debugging in JavaScript, especially in a Node.js server-side context, can be complex due to its asynchronous nature.
- Node Inspector is a tool that enhances the debugging experience by providing a visual interface to set breakpoints, inspect variables, and evaluate expressions.
- Historically, JavaScript debugging relied on console.log statements until tools like Node Inspector and browser developer tools emerged.
- Node Inspector, although deprecated now, revolutionized debugging by offering a Chrome DevTools-based interface for Node.js applications.
- Setting up Node Inspector involves running applications with the inspector flag to connect to Chrome DevTools.
- Examples like debugging asynchronous functions and event-driven applications showcase the utility of Node Inspector in identifying and resolving bugs.
- Advanced implementation techniques include utilizing debugging tools with stack traces for in-depth error analysis.
- Performance considerations when debugging include using conditional breakpoints and focusing on high-traffic routes to minimize overhead.
- Node Inspector contrasts with alternatives like console methods and manual stack trace analysis while offering real-time variable inspection.
- Real-world use cases for Node Inspector include tracking inter-service communication in microservices architecture and monitoring application performance.
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Dev
4w
22
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Learning JavaScript: Data Types, Functions ,Variables,Concatenation,Return
- JavaScript is a popular programming language used for creating interactive websites and web applications.
- JavaScript supports data types like strings, numbers, booleans, null, undefined, symbols, and big integers.
- Variables in JavaScript store data values and can be declared using let, const, and var.
- Functions in JavaScript are reusable blocks of code that perform tasks and can have parameters, arguments, and return statements.
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Dev
4w
363
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Discovering JavaScript's Hidden Secrets: Understanding Algorithms.
- Algorithms are vital step-by-step procedures for solving tasks and problems, originating from the work of mathematician Al-Khwārizmī.
- Efficient algorithms reduce time and resources, impacting program speed, scalability, and automation in computing.
- Algorithm design techniques like Brute Force, Divide and Conquer, Dynamic Programming, Greedy Algorithms, and Backtracking optimize problem solving.
- Randomized Algorithms introduce randomness for improved performance in processes like sorting and primality testing.
- Algorithms differ from design techniques; algorithms are concrete procedures, while techniques are abstract strategies for algorithm construction.
- Real-world applications demonstrate algorithms' role in areas like search engines, navigation apps, AI, cybersecurity, and finance.
- Algorithms form the basis of computing solutions, from sorting lists to training neural networks, shaping the digital world.
- Future episodes in Discovering JavaScript's Hidden Secrets will delve into specific algorithm categories and their practical implementations in JavaScript.
- Understanding algorithms is essential for honing problem-solving skills and excelling as an engineer beyond just interview preparation.
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Dev
4w
57
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Smarter JavaScript in 2025: 10 TypeScript Features You Can’t Ignore
- TypeScript in 2025 provides structure, clarity, and safety to modern JavaScript development with advanced features.
- Type Inference reduces boilerplate, keeps code clean, and accelerates development without sacrificing type safety.
- Template Literal Types, Discriminated Unions, and Variadic Tuple Types are among the powerful TypeScript features highlighted.
- TypeScript advancements like Type Guards, Custom Utility Types, and Type-Safe Routing in frameworks like Next.js contribute to building maintainable and scalable applications.
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Medium
4w
430
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Turning Objects into Arrays and Back in JavaScript
- Object.entries() converts objects into arrays of key-value pairs, leaving the original object unchanged.
- Arrays allow for easy manipulation like mapping, filtering, and sorting, which objects lack.
- Object.entries() only includes an object's own enumerable string keys, leaving out inherited or symbol-based ones.
- Order matters in Object.entries(): numeric keys are sorted first, while others retain their order.
- Object.entries() is useful for working with object data as a list, enabling transformations like mapping or filtering.
- Object.fromEntries() reverses the process by creating an object from an iterable of key-value pairs.
- Object.fromEntries() accepts any iterable, not just arrays, allowing for flexibility in data transformation.
- If two entries use the same key, the last one takes precedence in the resulting object.
- Object.fromEntries() is helpful for rebuilding objects after filtering out unwanted parts or updating values.
- Overall, Object.entries() and Object.fromEntries() provide a streamlined way to manipulate and reshape object data in JavaScript.
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Dev
4w
381
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The Cleanest Way to Add Optional Properties in JavaScript
- The conventional way of adding optional properties in JavaScript involves using if statements or Object.assign.
- A more concise, safe, and expressive method involves utilizing the && operator for adding optional properties in JavaScript objects.
- The pattern efficiently handles optional properties without the need for mutations or conditionals, making the code cleaner and more structured.
- This approach is recommended for scenarios like constructing payloads, working with dynamic data, and developing utility functions for better code readability and flexibility.
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Medium
4w
337
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Mastering the Pipeline Operator (|>) in JavaScript
- The pipeline operator in JavaScript simplifies function compositions by allowing a linear and readable syntax, improving code readability and maintainability.
- It passes the value on the left as an argument to the function on the right, enhancing functional programming practices.
- While still experimental, the operator can be used today with tools like Babel and offers benefits in terms of code predictability and testability.
- Using the pipeline operator makes complex operations like array transformations or object processing more streamlined and clear.
- The operator promotes clean, composable code with a focus on functional capabilities and better readability.
- By following basic syntax rules and understanding contextual execution, the pipeline operator can be effectively utilized in JavaScript.
- Refactoring code using pipelines allows for modular architecture, easier testing, and flexibility in adding or removing steps.
- The pipeline approach in JavaScript aligns well with the principles of clean code, enhancing codebase maintainability and scalability.
- An understanding of scope, execution context, and effective debugging practices is crucial when utilizing the pipeline operator.
- The pipeline operator represents a paradigm shift towards more readable, functional, and maintainable JavaScript code.
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Dev
4w
404
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Daily JavaScript Challenge #JS-190: Rotate a Matrix 90 Degrees Clockwise
- Daily JavaScript Challenge: Rotate a Matrix 90 Degrees Clockwise
- Challenge involves rotating an N x N matrix clockwise by 90 degrees in place.
- Developers are encouraged to write a solution, test it, and share their approach.
- Join the discussion and share your thoughts on the challenge. Documentation and test cases provided.
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