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Which tool is commonly used for executing unit tests in Angular applications?

  • Karma
  • Protractor
  • TypeScript
  • Webpack
The commonly used tool for executing unit tests in Angular applications is Karma. Karma is a test runner that is often used with Angular for running unit tests.
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The 'canLoad' Route Guard method checks whether a _____ can be loaded lazily.

  • component
  • directive
  • module
  • service
The 'canLoad' Route Guard method checks whether a module can be loaded lazily. It's used to control the lazy loading of feature modules in Angular applications.
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When a subscriber attaches to a cold observable, it gets its own independent execution of the _____.

  • Observable
  • Operator
  • Stream
  • Subscription
When a subscriber attaches to a cold observable, it gets its own independent execution of the Observable. A new instance of the observable's execution is created for each subscriber.
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How can you handle conditional validation for controls within a Form Array in Angular?

  • Define custom validation directives
  • Use a separate Form Array for each condition
  • Use the FormControl's setValidators method
  • Utilize the Validators.compose function
You can handle conditional validation in Angular for controls within a Form Array by using the setValidators method of the FormControl.
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Which Angular CLI command is used to create a new Angular project?

  • ng create project
  • ng generate project
  • ng new
  • ng start project
The command to create a new Angular project using Angular CLI is ng new. It sets up a new Angular project with the necessary files and dependencies.
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How can you prevent an expression from being re-evaluated in every change detection cycle while using interpolation in Angular?

  • Use a custom pipe
  • Use ngOnPush change detection strategy
  • Use one-time binding ({{::expression}})
  • Use trackBy with ngFor directive
In Angular, you can prevent an expression from being re-evaluated by using one-time binding ({{::expression}}).
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How can you convert a cold observable into a hot observable?

  • Apply the "subscribe" method
  • Implement the "map" operator
  • Use the "share" operator
  • Utilize the "take" operator
You can convert a cold observable into a hot observable by using the "share" operator, which allows multiple subscribers to receive the same values emitted by the observable simultaneously.
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In Angular, how can you ensure that your service correctly handles HTTP errors during testing?

  • Mock the HttpClient responses
  • Use a delay operator like debounceTime for error cases
  • Use real HTTP requests with a testing server
  • Wrap the service call in a try-catch block
To ensure that your Angular service correctly handles HTTP errors during testing, you should mock the HttpClient responses. This allows you to control the responses and simulate error scenarios in a controlled environment. Using real HTTP requests or delay operators like debounceTime is not recommended for testing HTTP error handling.
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Angular Elements are packaged as custom elements, a web standard for defining new HTML elements in a _____.

  • Directive
  • Module
  • Service
  • Shadow DOM
Angular Elements are packaged as custom elements, utilizing the web standard for defining new HTML elements in the Shadow DOM.
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How can you make a route parameter optional in Angular?

  • Add a "?" to the parameter
  • Use a default value
  • Use a wildcard route
  • Use a regex pattern
You can make a route parameter optional in Angular by adding a "?" to the parameter name in the route configuration. This indicates that the parameter is optional, and the route can still be matched without it.
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