App
component which renders a child component called Welcome
that is a stateless functional component. You can pass Welcome
a user
property by writing:
<App>You use custom HTML attributes that React provides support for to pass the property
<Welcome user='Mark' />
</App>
user
to the component Welcome
. Since Welcome
is a stateless functional component, it has access to this value like so:
const Welcome = (props) => <h1>Hello, {props.user}!</h1>It is standard to call this value
props
and when dealing with stateless functional components, you basically consider it as an argument to a function which returns JSX. You can access the value of the argument in the function body. With class components, you will see this is a little different.
Calendar
and CurrentDate
components in the code editor. When rendering CurrentDate
from the Calendar
component, pass in a property of date
assigned to the current date from JavaScript's Date
object. Then access this prop
in the CurrentDate
component, showing its value within the p
tags. Note that for prop
values to be evaluated as JavaScript, they must be enclosed in curly brackets, for instance date={Date()}
.
Calendar
component should return a single div
element.
testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(Calendar)); return mockedComponent.children().type() === 'div'; })(), 'The Calendar
component should return a single div
element.');
- text: The second child of the Calendar
component should be the CurrentDate
component.
testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(Calendar)); return mockedComponent.children().childAt(1).name() === 'CurrentDate'; })(), 'The second child of the Calendar
component should be the CurrentDate
component.');
- text: The CurrentDate
component should have a prop called date
.
testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(Calendar)); return mockedComponent.children().childAt(1).props().date })(), 'The CurrentDate
component should have a prop called date
.');
- text: The date
prop of the CurrentDate
should contain a string of text.
testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(Calendar)); const prop = mockedComponent.children().childAt(1).props().date; return( typeof prop === 'string' && prop.length > 0 ); })(), 'The date
prop of the CurrentDate
should contain a string of text.');
- text: The CurrentDate
component should render the value from the date
prop in the p
tag.
testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(Calendar)); return mockedComponent.find('p').html().includes(Date().substr(3)); })(), 'The CurrentDate
component should render the value from the date
prop in the p
tag.');
```
The current date is:
{ /* change code above this line */ }The current date is: {props.date}
{ /* change code above this line */ }