Soul Search

While trying to install Angular CLI in mac, I got below error  praseedpai@Praseeds-MBP ~ % npm install -g @angular/cli npm   ERR!   code  EACCES npm   ERR!   syscall  mkdir npm   ERR!   path  /usr/local/lib/node_modules/@angular npm   ERR!   errno  -13 npm   ERR!  Error: EACCES: permission denied, mkdir '/usr/local/lib/node_modules/@angular' Solution : sudo npm install -g @angular/cli

Polyfills in Angular are additional code snippets that provide compatibility with older browsers by implementing missing features that are not supported natively. They help ensure that an Angular application can run smoothly across different browsers, including older versions that may lack support for modern JavaScript features. Polyfills are typically included in an Angular project to address browser compatibility issues, especially for features introduced in newer versions of JavaScript (ES6/ES2015 and beyond), as well as HTML and CSS standards. These polyfills are applied automatically when the Angular application is loaded in the browser, ensuring that the application behaves consistently across different environments. Some common polyfills used in Angular applications include: Zone.js: Provides execution context for asynchronous operations and change detection. RxJS: Implements reactive programming features and utilities for handling asynchronous data streams. ES6 polyfills: Polyf...

  In Angular, npm (Node Package Manager) is a crucial tool used for managing dependencies and packages within Angular projects. Here's how npm is used in Angular development: Installing Angular CLI : Angular applications are typically scaffolded and managed using the Angular CLI (Command Line Interface), which is installed globally via npm. To install the Angular CLI, you can run the following npm command: cmd: npm install -g @angular/cli Creating New Angular Projects : Once Angular CLI is installed, you can use it to generate new Angular projects with a predefined directory structure, configuration files, and initial code. To create a new Angular project, you can run the following command: cmd: ng new my-angular-app Managing Dependencies : Angular applications often require external libraries and modules to add functionality or enhance development. These dependencies are managed using npm. You can install dependencies by running npm install <package-name> , and npm will down...

  Gradle and Maven are both popular build automation tools primarily used for Java projects, but they have some differences in their approach and features: Build Language : Maven uses XML-based configuration files ( pom.xml ) to define project settings, dependencies, and build phases. Gradle uses a Groovy-based or Kotlin-based DSL (Domain Specific Language) for defining build scripts. This DSL is more expressive and flexible than Maven's XML configuration. Convention vs. Configuration : Maven follows a convention-over-configuration approach, where project structure and build phases are predefined and standardized. Gradle offers more flexibility with its configuration-over-convention approach, allowing developers to customize the build process extensively. Performance : Gradle is often considered to have better performance compared to Maven, especially for large projects and incremental builds. This is partly due to its optimized dependency resolution algorithm and build caching mec...

  Centralized and distributed refer to the architecture of version control systems (VCS) like SVN (Subversion) and Git, respectively. Centralized Version Control System (SVN) : In SVN, there is a single, central repository where all files and their history are stored. Developers check out files from this central repository to work on them locally. Changes made by developers are committed directly to the central repository. Each developer typically has their own working copy of the files, but they all synchronize with the central repository. Distributed Version Control System (Git) : In Git, every developer has a complete copy of the repository, including its full history, on their local machine. Developers can work independently on their local copies of the repository, making commits and creating branches without needing access to a central server. Changes are shared between developers by pushing and pulling commits between repositories. There is no single point of failure, and dev...

  JavaScript, jQuery, and Angular are all popular technologies used for web development, but they serve different purposes and have distinct characteristics: JavaScript (JS): JavaScript is a programming language commonly used for web development. It is the core language of the web and is supported by all modern web browsers. JavaScript allows developers to add interactivity, manipulate DOM elements, handle events, and create dynamic content on web pages. It is versatile and can be used for both client-side and server-side development (with Node.js). jQuery: jQuery is a lightweight JavaScript library that simplifies HTML document traversal and manipulation, event handling, and animation. It provides a concise and easy-to-use API for common tasks, allowing developers to write less code and achieve more with fewer lines. jQuery abstracts many browser inconsistencies and provides cross-browser compatibility, making it easier to write code that works across different browsers. While jQu...

  SPA stands for Single Page Application. It's a type of web application that loads a single HTML page and dynamically updates the content as the user interacts with the application. This means that the page does not reload during use, resulting in a smoother and more responsive user experience. Key characteristics of SPAs include: Client-Side Rendering: Most of the rendering logic is performed on the client side using JavaScript frameworks like Angular, React, or Vue.js. Dynamic Content Loading: Instead of fetching complete HTML pages from the server, SPAs fetch data (usually in JSON format) and update the page content dynamically without requiring a full page reload. Routing: SPAs use client-side routing to handle navigation within the application. This allows for updating the URL without actually requesting a new page from the server. Improved Performance: SPAs typically load faster after the initial page load because they only fetch data and update parts of the page as need...

 Objects can be created in two ways. Factory Function Constructor Function // two ways to create object // Factory function function createCircle ( radius ) { return { radius , draw : function () { console . log ( 'draw' , radius ); } }; } const circle = createCircle ( 5 ); circle . draw (); // Constructor function function Circle ( radius ) { this . radius = radius ; this . draw = function () { console . log ( 'draw' , this . radius ); } } const obj = new Circle ( 3 ); obj . draw ();

Procedural programming is a programming paradigm that focuses on defining a series of steps or procedures for the computer to follow in order to accomplish a task. It revolves around breaking down a problem into smaller, more manageable parts called procedures or functions, which can then be executed sequentially. In procedural programming, the program's logic is expressed as a series of function calls and control flow statements that modify data stored in variables. This paradigm is generally straightforward and easy to understand, making it suitable for small to medium-sized programs. However, as programs grow larger and more complex, procedural programming may become difficult to manage due to its lack of modularity and code reusability compared to other paradigms like object-oriented programming. Object Oriented Programming (OOP) is a  programming paradigm or style centered around objects.  The key principles of OOPS are Encapsulation:  Bundling data and methods that...

  Hoisting is a JavaScript mechanism where variables and function declarations are moved to the top of their containing scope during the compilation phase, before the code is executed. This means that regardless of where variables and functions are declared within a scope, they are accessible throughout that entire scope. Hoisting applies to both variable declarations ( var , let , and const ) and function declarations. However, it's important to note that only the declarations are hoisted, not the initializations. Here's how hoisting works for variables declared with var : console.log(x); // Output: undefined var x = 5; console.log(x); // Output: 5 During the compilation phase, the variable declaration var x; is hoisted to the top of its containing scope. At runtime, the assignment x = 5; occurs as usual. When console.log(x); is executed, x exists in the scope, but it hasn't been assigned a value yet, so it logs undefined . However, hoisting works differently for varia...