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Javascript
Hackernoon
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You Can Apparently Make JavaScript Art Now
- P5.js 2.0 brings major upgrades for creative coders, including variable fonts, JavaScript shaders, expanded color spaces, and unified pointer events.
- React introduces experimental features such as View Transitions for UI animations and Activity Component for efficient UI state management.
- SolidJS reflects on a decade of developing the project, highlighting its impact on reshaping frontend architecture and driving industry-wide adoption of signal-based reactivity.
- Other tool updates include jsvu 3.0, SmallJS 1.6, Scala.js 1.19.0, and ESLint v9.25.1.
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Medium
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114
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How setTimeout and setInterval Work in JavaScript
- Timers in JavaScript, such as setTimeout and setInterval, are managed by the environment around JavaScript, not the engine itself.
- When setTimeout is called, the function won't necessarily run exactly after the specified time but after it, depending on other tasks.
- setInterval sets up a repeating schedule, adding functions to the task queue each time the timer fires.
- If JavaScript is busy when setInterval fires again, the new task has to wait its turn, making it a reminder rather than immediate execution.
- The passed delay in setTimeout and setInterval is a minimum; the function may run later due to timer scheduling and JavaScript's workload.
- JavaScript adds timer functions to a queue of tasks which are executed when the current stack is empty.
- Long-running synchronous code can delay timer callbacks as JavaScript completes the current tasks before moving to queued tasks.
- setInterval may cause delays and skipped intervals if callbacks take too long, affecting the desired timing.
- Modern browsers throttle timers in background tabs to save resources, potentially affecting the precision and consistency of timer execution.
- The event loop controls when timer callbacks run, ensuring tasks are executed in the order they were added, based on JavaScript's workload.
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Dev
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Quick introduction to isomorphic-validation javascript library.
- Isomorphic-validation is a Javascript library for client and server-side validation.
- The library allows reusing validation logic across different forms in an application.
- Validation objects in isomorphic-validation can be grouped and have different states.
- The library simplifies client-side form validation and provides UI effects for indicating field validity state.
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Medium
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348
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enum-plus: Believe it or Not, This Might be Your Last Javascript Enum Library
- Enum-plus is a JavaScript enum library that enhances the native enum with features like display text, localization, UI control binding, and extension methods.
- It is a lightweight, TypeScript library compatible with any front-end framework and enables generating UI controls with ease.
- Extended enum features include localization support, allowing flexibility in displaying text as per language environment.
- The library facilitates dynamic enum creation using data from APIs, supporting direct access to enum values.
- Methods like 'items' provide a read-only array of all enum items for generating UI controls based on Ant Design specifications.
- Additional methods like 'toSelect', 'toMenu', 'toFilter', and 'toValueMap' offer diverse data formats for various UI components.
- With TypeScript, enum values and keys are available as union types for precise type constraints, enhancing code safety.
- By centralizing localization with 'Enum.localize', consistent localization across enums is ensured, with options to override at the enum level.
- Hovering over enum items in the code editor displays Jsdoc comments, enabling quick access to item documentation.
- The library offers seamless integration with popular UI libraries like Material-UI, ElementPlus, Ant Design Vue, Angular Material, and more.
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Dev
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59
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Building Scroll-Linked Parallax Effects in Pure Tailwind and Vanilla JavaScript
- Parallax scrolling — where elements move at different speeds relative to scrolling — can make a website feel deeply dynamic.
- Benefits of using pure Tailwind CSS and vanilla JavaScript for scroll-linked parallax effects include massively reduced page weight, customizable to any design system, and better performance for mobile users.
- The process involves creating layers using Tailwind CSS, implementing basic JavaScript for parallax scrolling, and assigning different speeds to different layers.
- The alternative options mentioned are Locomotive Scroll, which adds inertia and smooth-scroll parallax but is a heavy dependency, and GSAP ScrollTrigger, which is great for animation timelines but may be overkill for basic parallax effects.
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Dev
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Beginner-Friendly Guide to Solving "Count Subarrays With Fixed Bounds" | LeetCode 2444 Explained (C++ | JavaScript | Python)
- The article provides a beginner-friendly guide to solving the "Count Subarrays With Fixed Bounds" problem on LeetCode, focusing on arrays, sliding window, and greedy algorithms.
- It explains the problem of counting contiguous subarrays with specific minimum and maximum elements and offers a step-by-step approach to tackle the problem efficiently.
- The initial approach involves a naive brute-force method, which is inefficient for larger arrays, prompting the need for a smarter solution.
- Key observations during array scanning help optimize the solution by ignoring elements that do not meet the criteria and tracking the latest occurrences of the minimum and maximum elements.
- The visual walkthrough illustrates how to identify valid subarrays, enhancing understanding of the problem-solving strategy.
- The code strategy involves looping through the array, updating positions, and calculating the valid subarrays efficiently.
- The time complexity is O(n) for a single pass through the array, with O(1) space complexity due to no extra data structures.
- Full working solutions are provided in C++, JavaScript, and Python, showcasing the implementation of the optimized approach.
- Final takeaways include the importance of immediate element reset on going out of bounds and continuous tracking of minimum and maximum element occurrences.
- The problem teaches pattern recognition, window management, and greedy optimizations essential for advanced coding interviews.
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Dev
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128
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How I Use ChatGPT to Speed Up My JavaScript Learning
- With AI tools like ChatGPT, learning JavaScript becomes smarter, faster, and more interactive.
- ChatGPT helps in learning JavaScript concepts quickly by providing clear explanations, analogies, and code snippets.
- It also assists in debugging code and suggesting optimization techniques for JavaScript functions.
- ChatGPT offers project ideas and explains advanced topics like the JavaScript event loop.
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Medium
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189
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Event Delegation in JavaScript Explained
- When interacting with a web page, the browser creates an event object to describe the action and sends it to the code.
- Event delegation in JavaScript relies on the structure of the DOM, the Document Object Model.
- Events in the browser follow a journey: top-down, target, and then up again.
- Event listeners in the capturing phase can be set with the third argument as true.
- Event delegation involves setting up a single listener on a parent element to handle events from its children.
- Delegation simplifies handling multiple dynamically generated elements without the need for individual listeners.
- Delegation allows for efficient event handling on elements that may not be present on the page initially.
- Using closest in event delegation allows for flexibility in handling events on nested elements.
- Delegation works with various events that bubble up through the DOM, such as input, change, and keyup.
- Event delegation offers control over which elements trigger specific actions, based on event target attributes.
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Dev
2M
279
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🤷♀️ SeraJS is a lightweight, signal-based reactive JavaScript library
- SeraJS is a lightweight, signal-based reactive JavaScript library for building dynamic user interfaces.
- SeraJS focuses on minimalism and performance without sacrificing developer experience.
- It is just 1.25KB gzipped and only 135 lines of code, making it remarkably lightweight with powerful reactivity.
- SeraJS uses a signal-based reactive system, providing efficient updates and fine-grained DOM element updates for high performance.
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Dev
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339
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JavaScript Mastery Showdown: Precision, Power, and Performance
- JavaScript Mastery Showdown: Precision, Power, and Performance
- 1. Clash at Hoisting Highlands
- 2. Duel in Closure Caverns
- 3. Prototypes & Inheritance Arena
- 4. The Async Abyss & Concurrency Coliseum
- 5. Metaprogramming & Reflects
- 6. Generators, Observables & Streams Showdown
- 7. The WebAssembly Warfront
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Dev
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Daily JavaScript Challenge #JS-164: Generate All Possible IP Addresses
- This is a daily JavaScript coding challenge related to string manipulation.
- The challenge involves writing a function to restore a string of digits by returning all possible valid IP address combinations.
- Each IP address consists of four octets separated by decimal points, and each octet must be between 0 and 255 inclusive.
- The challenge requires avoiding leading zeros except for zero itself.
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Medium
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206
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How JavaScript Handles Garbage Collection and Memory
- JavaScript manages memory through the stack and heap. Primitives like numbers are stored on the stack, while objects go to the heap.
- Function calls create stack frames that hold local variables and parameters, which are discarded once the function completes.
- Memory usage grows as programs run, especially with dynamic data structures like arrays that reside in the heap.
- Closures in JavaScript can retain memory even after the outer function finishes, influencing garbage collection.
- Objects are shared by reference, and memory remains active until all references are released.
- The garbage collector in JavaScript decides what data to clean up based on reachability from active parts of the program.
- Modern engines like V8 use a generational garbage collector that marks and sweeps memory to reclaim unused objects.
- References to variables, closures, and nested objects can prolong memory retention until they are no longer reachable.
- Circular references are handled by modern engines to ensure proper clean-up when no external references remain.
- Garbage collection in JavaScript is crucial for maintaining memory efficiency and program performance.
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Dev
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128
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JavaScript is single-threaded but with async features? 🤔
- JavaScript is single-threaded and can only handle a single task at a time.
- Asynchrony in JavaScript comes from its runtime environment.
- APIs (Application Programming Interfaces) play a key role in JavaScript's asynchronous capabilities.
- Web APIs provided by the environment allow JavaScript to interact with low-level system operations.
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Dev
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Create Your Own JavaScript Game: Memory Match in Under 100 Lines
- If you’ve ever wanted to build your own game using JavaScript, a memory match game is a perfect beginner-friendly project that’s both fun and practical.
- With fewer than 100 lines of code, you can develop an interactive and rewarding experience for players—no frameworks needed.
- Players flip two cards at a time, and if the cards match, they stay flipped, otherwise they flip back after a short delay.
- The goal is to match all pairs, and by the end, you’ll not only have a fully functional game but also the confidence to expand or customize it your own way.
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Testim.io
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A Guide to Choosing the Best JavaScript Editor
- JavaScript is crucial for creating interactive user interfaces on websites, making it essential to choose the right tools for working with it.
- Text editors are basic tools for creating and editing plain-text files, while IDEs offer more specialized features for software development.
- The distinction between code editors and IDEs is becoming less clear as modern editors integrate advanced features.
- Online editors like JSFiddle are ideal for small code snippets and quick prototyping, while offline editors like WebStorm offer deeper integration and support for large projects.
- Seven best JavaScript editor choices include Zed, Visual Studio Code, Eclipse, Sublime Text, WebStorm, NetBeans, and Vim, each with its own pros and cons.
- Key factors to consider when choosing a JavaScript editor include flexibility, integration support, project management, performance, and debugging capabilities.
- Features to look for in a JavaScript editor include version control tools, code navigation, linting, compatibility, auto-completion, plugins, debugging tools, and live preview.
- Choosing between Visual Studio Code and Sublime Text often comes down to user experience and familiarity with the tools.
- Having a good JavaScript editor enhances developer efficiency and workflow, leading to improved code quality and productivity.
- Ultimately, the best JavaScript editor for you depends on your specific needs and preferences, so it's important to explore different options before making a decision.
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