Angular

The Angular CLI is a command-line interface tool that allows developers to create, build, and serve Angular applications.

Angular provides an ErrorHandler class that can be used to catch and handle errors. You can also use try-catch blocks and the async pipe to handle errors in templates.

A component is a self-contained piece of UI, while a directive is an attribute that can be applied to an existing element to extend its behavior.

Angular provides a RouterModule that can be used to configure routes. You can define routes using the @NgModule decorator and the Routes array.

A service is a class that provides a specific functionality that can be used by multiple components. Services are typically used to share data between components or to encapsulate business logic.

You can inject a service into a component using the constructor and the @Inject decorator. The service must be provided in the component's module or a parent module.

The ngOnInit hook is called after the component's properties have been initialized, while the ngAfterViewInit hook is called after the component's view has been initialized.

The async pipe can be used to subscribe to observables in templates. It automatically unsubscribes when the component is destroyed.

The ChangeDetectionStrategy determines how Angular detects changes to a component's properties. The default strategy is ChangeDetectionStrategy.Default.

A custom pipe can be implemented by creating a class that implements the PipeTransform interface. The pipe must be declared in the @NgModule decorator.

A subject is a basic implementation of the observer pattern, while a behavior subject is a subject that stores the current value and emits it to new subscribers.

The HttpClient can be used to make HTTP requests. It provides methods such as get, post, put, and delete.

The TestBed is a testing utility that provides a way to configure and create a testing module. It can be used to test components, services, and pipes.

A component can be tested using the TestBed and the Jasmine testing framework. You can write unit tests to test the component's properties and methods.

A template-driven form uses template markup to define the form, while a model-driven form uses a model to define the form.

Forms can be validated using validators such as required, minlength, and maxlength. You can also create custom validators.

The ng-container directive is a grouping element that can be used to apply structural directives without adding an extra element to the DOM.

The ngClass directive can be used to apply CSS classes to an element based on a condition.

The ngStyle directive can be used to apply inline styles to an element based on a condition.

Internationalization can be implemented using the LOCALE_ID token and the translate pipe.

The CanActivate guard determines whether a route can be activated, while the CanActivateChild guard determines whether a child route can be activated.

A custom guard can be implemented by creating a class that implements the CanActivate interface. The guard must be provided in the component's module or a parent module.

The Ivy compiler is a next-generation compiler that provides faster compilation and smaller bundle sizes.

The ComponentStore is a state management utility that provides a way to manage global state. It can be used to share data between components.

Standalone components are self-contained components that do not require a module, while non-standalone components require a module.