Persistent Systems UI Developer Interview Questions and Answers

Dependency injection is a design pattern that allows objects to receive dependencies rather than creating them internally.

• It helps to decouple the code and makes it more testable.

• It allows for easier maintenance and scalability.

• It can be implemented using constructor injection, setter injection, or interface injection.

• Example: Instead of creating a database connection object within a class, it can be passed as a depend

NgModule is a decorator that defines a module in Angular.

• NgModule is used to group related components, directives, and services.

• It helps to organize the application into smaller, manageable pieces.

• It can import other modules and export its own components, directives, and services.

• It can also provide configuration for dependency injection.

• Example: @NgModule({ imports: [CommonModule], declarations: [AppComponent], export

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

• A closure is created when a function is defined inside another function.

• The inner function can access variables in the outer function, even after the outer function has returned.

• Closures are commonly used to create private variables and functions in JavaScript.

• Example: function outer() { var x = 10; functio...read more