• 10 hours
  • Medium

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Last updated on 3/31/22

Working With Components

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Evaluated skills

  • Explain JavaScript frameworks and libraries are
  • Use "create-react-app" to generate, develop, and build your React project
  • Turn specifications into a well-architected React application
  • Question 1

    If a component is written as a Javascript function, and then rewritten as a Javascript class, the return value of its `render` function should be:

    Careful, there are several correct answers.
    • the elements that the component should render.

    • nothing – render functions render via JSX and don't need a return value.

    • exactly the same as the return value of the component when it was written as a function.

  • Question 2

    Component `props` are:

    Careful, there are several correct answers.
    • read-only.

    • passed in when the component is called.

    • available to all of a component's child component descendants.

    • one of many ways that components can pass information to their children.

  • Question 3

    The right place for code meant to run during a component's initialization is:

    When a component's output is first inserted into the DOM it will trigger a hook called `componentDidMount`, and when it's removed from the DOM it will trigger one called `componentWillUnmount

    • in the return value of the `render` function.

    • in the constructor function.

    • in a function called 'componentDidMount'.

    • in a function called 'componentWillUnmount'.