Roberto Heckers’ Post

🧑💻 TypeScript Generics: Flexibility with Type Safety Generics in TypeScript empower us to write reusable, type-safe code by enabling a function, class, or interface to work with any data type without losing type information. 🚀 Why Use Generics? - Code Reusability: Write once, use with any type. - Type Safety: Detects errors at compile time. - Flexibility: Works with various data types while maintaining strict typing rules. Example: A Generic Function Here’s a simple example of a generic function to return an element from an array: function getFirstElement<T>(array: T[]): T { return array[0]; } // Usage const number = getFirstElement([10, 20, 30]); // Type: number const word = getFirstElement(['apple', 'banana']); // Type: string console.log(number); // Output: 10 console.log(word); // Output: apple 🔧 How it Works: - <T> : Declares a type parameter "T", which acts as a placeholder for the type passed during the function call. - The function adapts to any type (e.g., "number", "string"), maintaining type safety. If you try to use it incorrectly, TypeScript will catch the error at compile time. PS: Generics go beyond functions—they can be used with classes, interfaces, and React components, making your code robust and scalable! 🚀 #TypeScript #Generics #CodeReusability #TypeSafety #JavaScript #FrontendDevelopment #WebDevelopment #TypeScriptTips #Programming

How to check how safe your TypeScript code is? We all know that TypeScript is a superpower for frontend development. But how do you know how effectively you're using it? Meet type-coverage – your personal X-ray for code! 🩻 Why does type-coverage deserve your attention? 1. This powerful CLI tool doesn't just analyze code – it provides an exact percentage of your project's type safety. 🎯 2. Type-coverage identifies potentially dangerous areas, including: • Use of 'any' • Type assertions (as and angle brackets) • Non-null assertions (!) • Use of the generic Object type 3. Get a detailed report on areas that need improvement in type safety, and take your code quality to the next level. 4. For visual aesthetes: use typescript-coverage-report and enjoy a graphical representation of the data. Interesting fact: TypeScript, created by Microsoft in 2012, is now used by millions of developers worldwide. Its popularity is due to its ability to prevent up to 15% of errors at the compilation stage! Links to dive into the world of type safety: • type-coverage: https://lnkd.in/dcFGR8TT • typescript-coverage-report: https://lnkd.in/dBFVTxKs ♻ Share this post with fellow developers – let their code become even more reliable! 💪 #typescript #javascript #frontend #webdevelopment #typing #codesafety #developertools

🚫 𝟳 𝗖𝗼𝗺𝗺𝗼𝗻 𝗠𝗶𝘀𝘁𝗮𝗸𝗲𝘀 𝘁𝗼 𝗔𝘃𝗼𝗶𝗱 𝗪𝗵𝗲𝗻 𝗨𝘀𝗶𝗻𝗴 𝗡𝗼𝗱𝗲.𝗷𝘀 💡 Node.js is powerful, but even experienced developers can fall into common traps that affect performance and scalability. In my latest article, I highlight the 7 mistakes you should avoid when working with Node.js and share tips on how to write better code. 🚀 🔗 𝗥𝗲𝗮𝗱 𝘁𝗵𝗲 𝗳𝘂𝗹𝗹 𝗽𝗼𝘀𝘁 𝗵𝗲𝗿𝗲: https://lnkd.in/d58egE-A Make sure your Node.js projects are efficient, secure, and easy to maintain by avoiding these common pitfalls! 💪 #NodeJS #WebDevelopment #BackendDevelopment #JavaScript #Programming #CodingTips

🏆 Mastering tsconfig.json in TypeScript: Exploring compilerOptions 🛠️✨ ---------------------------------------------------------------------------- 💢 I understand the concept may be a bit advanced for some developers but trust me when I tell you that sooner or later your knowledge regarding these concepts will be put to test, So stop procastinating and dive right in. 🏊♂️ 🏊♀️ 💥 ---------------------------------------------------------------------------- The compilerOptions section in tsconfig.json is the engine room of TypeScript, controlling how your TypeScript code compiles into JavaScript. But what do these options mean? How do they affect your project? 🤔 Start tweaking your tsconfig.json today to unleash the full power of TypeScript! 🚀 ====================================================== #TypeScript #WebDevelopment #CodingTips #TypeSafety #FrontendDevelopment #SoftwareEngineering

#Day79 of #100DaysOfCode 🪶 Revised Arrays Problems based: ✨ (Sort colors)Dutch National flag algorithm, ✨ (Majority Element)Moore’s Voting Algorithm ✨ Count Nodes Less than O(N) Time complexity. ✅ Gave one OA of Frontend. 🚀 Implemented Jenkins Pipeline Using Docker agent. ✨ Why i used Docker agent? ✨ Because when there is no active build for an pipeline. ✨ Docker creates an node, when done processing it deletes the docker container. ✨ Where as its not possible with jenkins to set nodes to zero. 📖 Learned about difference between Interface and abscract classes modifier in Typescript. ✨ Interface: ✅Its an Strict Blueprint of a class. ✅Its syntax is like an like an object. ✅It uses Impements keyword to implement on class. ✨ Abscract: ✅Its same as Interface but we cannot create a Instance of its Abscract class. ✅Instead First we will create one more class constructor extends it to abscract class then we can create an instance of a class. ✅It uses extends keyword to implement on class 🌞 Day 5 of Revising Frontend (Revised JavaScript Concepts and React Basic Concepts). Sharing my learnings as I progress towards becoming a better frontend web developer. Stay tuned for more! #reactjs #javascript #frontend #webdevelopment #datastructures #algorithms #leetcode

Want to integrate TS in ongoing JS project ? TypeScript's flexibility allows developers to integrate it smoothly into various workflows and projects. Here are some aspects of its flexibility: 1. **Gradual Adoption**: Teams can incrementally adopt TypeScript. You can start by renaming a few JavaScript files to `.ts` and gradually add types where needed, allowing for a seamless transition. 2. **Type Inference**: TypeScript automatically infers types when not explicitly defined, enabling developers to use it with varying degrees of strictness. This means you can start with less type checking and enhance it over time. 3. **Integration with JavaScript**: TypeScript is fully compatible with existing JavaScript code. You can mix and match TypeScript and JavaScript files in the same project, allowing for flexibility in how you structure your code. 4. **Configurable Compiler Options**: TypeScript’s compiler options can be tailored to fit different projects and coding styles, allowing teams to enforce specific type-checking rules or to relax them as needed. 5. **Rich Ecosystem**: TypeScript can work with a variety of libraries and frameworks (like React, Angular, and Node.js), making it adaptable to different development environments and architectures. 6. **Modular Development**: Its support for modules encourages clean, modular architecture, allowing developers to structure their applications in a way that fits their specific needs. This flexibility makes TypeScript suitable for a wide range of projects, from small scripts to large-scale applications.

Deno 2.0 It's a modern runtime for JavaScript and TypeScript that was created by Ryan Dahl, the original creator of Node.js. Deno addresses some of the design decisions in Node.js that Ryan later considered problematic, such as the lack of built-in security and the handling of modules. Here are some key features of Deno: ->Built-in TypeScript support: Unlike Node.js, Deno has first-class TypeScript support out of the box. ->Secure by default: Deno is secure by default, meaning it doesn't allow file, network, or environment access unless explicitly granted using flags like --allow-read, --allow-net, etc. ->Single executable: Deno is distributed as a single executable binary. ->Uses ES modules: Deno uses ES modules (via URLs) for importing packages, rather than Node's CommonJS system. ->Standard library: Deno provides a standard library with utilities for common tasks, which are all audited and secure. ->No package.json or node_modules: It doesn't use a package.json file or the node_modules directory for dependencies. Instead, you can import code directly from URLs. Deno is aimed at being a more modern, secure, and simpler alternative to Node.js, though they serve similar purposes.

Does TypeScript Compile My React Code? A common question that’s always good to review is whether TypeScript compiles your React code. The way TypeScript works is similar to this interaction: TS: “Hey, is this all your UI code?” React: “Yup!” TS: “Cool! I’m going to compile it and make sure you didn’t miss anything.” React: “Sounds good to me!” So the answer is yes, it does! But later, when we cover the tsconfig.json settings, most of the time you’ll want to use "noEmit": true. What this means is TypeScript will not emit JavaScript out after compilation. This is because typically, we’re just utilizing TypeScript to do our type-checking. The output is handled, in a CRA setting, by react-scripts. We run yarn build and react-scripts bundles the output for production. To recap, TypeScript compiles your React code to type-check your code. It doesn’t emit any JavaScript output (in most scenarios). The output is still similar to a non-TypeScript React project.

🚀 New Blog Alert! 🎯 Title: Forcing Modules With moduleDetection in TypeScript 💡 Description: Dive into the world of TypeScript's moduleDetection setting and discover how the force option can enhance modularity, reduce errors, and align your code with modern JavaScript practices. From setting up your tsconfig.json to best practices, this guide covers it all. ✨ Key Takeaways: Stronger isolation between files 🛡️ Error prevention through explicit dependencies 🚫💥 Real-world alignment with modern JS environments 🌍 🔗 Check out the full article and level up your TypeScript skills: https://lnkd.in/dNrGRe43 #TypeScript #WebDevelopment #ProgrammingTips #JavaScript #CleanCode

✔ Use case of 'never' type in TypeScript: The 'never' type is useful when we have a code that will never execute.  Such as functions that never reach the return statement. Or a function that always throws an error. In these cases, we can annotate the return type of the function as 'never'. For example: function throwError(message: string): never {  throw new Error(message); } ⚠️ Difference between 'never' and 'void': Void can have 'undefined' or 'null' as a value where as never cannot have any value. Consider the following code: let something: void = null; // Correct let nothing: never = null; // Error The second line will return an error:  Type 'null' is not assignable to type 'never' 🔰Note: in JavaScript, when a function doesn't return any value, it actually returns 'undefined'. So the return type of this function can be 'void'. #typescript #never_type #error_handling #return_type