10+ Siemens Web Developer Interview Questions and Answers

JavaScript is a programming language used for web development, while Angular is a JavaScript framework for building web applications.

• JavaScript is a programming language that allows developers to add interactivity and dynamic features to websites.

• Angular is a JavaScript framework that provides a structure for building web applications.

• JavaScript can be used independently to create web functionality, while Angular is built on top of JavaScript and provides additional features ...read more

Components can interact in Angular through input and output bindings.

• Input bindings allow a parent component to pass data to a child component.

• Output bindings allow a child component to emit events to a parent component.

• Components can also communicate through a shared service or using @ViewChild and @ContentChild decorators.

var is function-scoped and let is block-scoped.

• var declarations are hoisted to the top of their scope, while let declarations are not.

• var can be redeclared in the same scope, while let cannot.

• let variables are not accessible before they are declared, while var variables are.

• let variables have a temporal dead zone, while var variables do not.

• let is recommended for use in modern JavaScript.

Pseudo elements/children are CSS selectors that target specific parts of an element.

• Pseudo elements are denoted by a double colon (::) and are used to style a specific part of an element, such as the first letter or line of text.

• Pseudo children are denoted by a single colon (:), and are used to select a specific state of an element, such as when it is being hovered over or clicked.

• Examples of pseudo elements include ::before and ::after, which add content before or after an e...read more

A service in Angular is a singleton object that can be injected into components and other services.

• Services are used to share data and functionality across multiple components

• Services can be used to make HTTP requests, handle authentication, and perform other tasks

• Services are typically defined using the @Injectable decorator

• Services can be injected into components and other services using the constructor

Optional chaining is a feature in JavaScript that allows you to access properties of an object without worrying about whether the object is null or undefined.

• It uses the question mark (?) operator to check if a property exists before accessing it.

• It can be used with both object properties and function calls.

• It can be chained multiple times to access nested properties.

• It was introduced in ECMAScript 2020.

Angular app bootstraps the root module of the application

• Angular app bootstraps the AppModule by default

• The bootstrap process initializes the application and loads the root component

• The root component is usually AppComponent

Closure is a function that has access to its outer function's variables, even after the outer function has returned.

• A closure is created when a function returns another function that references variables from the parent function.

• Closures can be used to create private variables and methods in JavaScript.

• Closures can also be used to create functions with pre-set arguments.

Hoisting is a JavaScript mechanism where variables and function declarations are moved to the top of their scope.

• Hoisting applies to variable and function declarations, but not to variable assignments

• Function declarations are hoisted before variable declarations

• Hoisting can lead to unexpected behavior and should be avoided

TypeScript is a superset of JavaScript that adds static typing and other features.

• TypeScript catches errors at compile time, while JavaScript only catches them at runtime.

• TypeScript supports interfaces and classes, making it easier to write and maintain large codebases.

• JavaScript is more flexible and easier to learn, but TypeScript offers better scalability and maintainability.

• TypeScript can be transpiled into JavaScript, so it can be used in any environment that supports Jav...read more