Questions and Answers
What is the role of a component in Angular applications?
Which function does a directive primarily serve in an Angular application?
Which of the following best describes a pipe in Angular?
What is the primary purpose of a service in Angular?
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Which component is essential for managing navigation in an Angular application?
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Study Notes
Components
- Building blocks of Angular applications
- Represent a piece of user interface (UI)
- Consist of:
- Template (HTML)
- Class ( TypeScript)
- Metadata (decorator)
- Can contain other components (nesting)
- Can communicate with each other through:
- Property binding
- Event binding
- Services
Directives
- Instructions in the template that manipulate the DOM
- Can be:
- Component directives (e.g.
ngComponentOutlet
) - Attribute directives (e.g.
ngClass
,ngStyle
) - Structural directives (e.g.
ngIf
,ngFor
)
- Component directives (e.g.
- Used to:
- Add or remove elements from the DOM
- Change the appearance or behavior of elements
- Respond to user input
- Can be custom-built or used from the Angular framework
Pipes
- Functions that transform data in the template
- Used to:
- Format data (e.g. dates, currencies)
- Filter data (e.g. sorting, filtering)
- Convert data types
- Can be:
- Built-in pipes (e.g.
json
,async
) - Custom-built pipes
- Built-in pipes (e.g.
- Used in the template with the
|
symbol (e.g.{{ value | json }}
)
Services
- Singleton objects that provide a specific functionality
- Used to:
- Share data between components
- Perform complex operations
- Interact with external systems (e.g. APIs)
- Can be:
- Injected into components using dependency injection
- Used as a provider for other services
- Examples: logging, authentication, data storage
Routing
- Mechanism for navigating between views in an Angular application
- Uses the URL to determine which view to display
- Consists of:
- Routes configuration (e.g.
app-routing.module.ts
) - Route parameters (e.g.
:id
) - Route guards (e.g. authentication)
- Routes configuration (e.g.
- Can be used to:
- Create a navigation menu
- Dynamically load components
- Preserve application state between views
Components
- Angular applications are built using components, which represent a piece of user interface (UI)
- A component consists of a template (HTML), a class (TypeScript), and metadata (decorator)
- Components can contain other components (nesting) and communicate with each other through property binding, event binding, and services
Directives
- Directives are instructions in the template that manipulate the DOM
- There are three types of directives: component directives, attribute directives, and structural directives
- Directives are used to add or remove elements from the DOM, change the appearance or behavior of elements, and respond to user input
- Examples of built-in directives include
ngClass
,ngStyle
,ngIf
, andngFor
Pipes
- Pipes are functions that transform data in the template
- Pipes are used to format data (e.g. dates, currencies), filter data (e.g. sorting, filtering), and convert data types
- There are built-in pipes (e.g.
json
,async
) and custom-built pipes - Pipes are used in the template with the
|
symbol (e.g.{{ value | json }}
)
Services
- Services are singleton objects that provide a specific functionality
- Services are used to share data between components, perform complex operations, and interact with external systems (e.g. APIs)
- Services can be injected into components using dependency injection and used as a provider for other services
- Examples of services include logging, authentication, and data storage
Routing
- Routing is a mechanism for navigating between views in an Angular application
- Routing uses the URL to determine which view to display
- A route configuration defines the routes in an application (e.g.
app-routing.module.ts
) - Route parameters (e.g.
:id
) and route guards (e.g. authentication) can be used to customize routing behavior - Routing can be used to create a navigation menu, dynamically load components, and preserve application state between views
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Description
Learn about the building blocks of Angular applications, including components and directives. Understand how to use them to create and manipulate the user interface.