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Props - parameters

Most of the components can be customized when they are created with various parameters. These creation options are named - props.

Your own components can also use props. This allows you to create a single component that will be used in many different places in your application, with slightly different properties in each place. To get their values, refer to props.YOUR_PROP_NAME in your functional components or this.props.YOUR_PROP_NAME in your class components.

Here's an example:

Using name as props allows us to customize the greeting component so that we can reuse that component for each of our greetings. This example also uses the JSX HelloWorld component. The ability to do this is what makes React so awesome.

Only for reading

A component declared as a function or class should never modify its props properties. Consider this sum function:

const sum = (a, b) => a + b

Such functions are called "clean". Because they don't change their arguments and always return the same result for the same arguments.

In contrast, the following function is not clean because it changes its arguments:

const count => (account, amount) => account += amount

React is very flexible, but it has one strict rule:

tip

All React components should act as pure functions with respect to their props properties.

Questions

What are the parameters for creating a component called?

  1. prop
  2. props

A component declared as a function or class should never modify its props properties?

  1. true
  2. false

Should all React components work as pure functions with respect to their props properties?

  1. true
  2. false

To see how well you learned this lesson, take the test in the mobile application of our school on this topic or in the telegram bot.

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  1. React Native - official website
  2. Learn React

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Dmitriy Vasilev

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