score:5
props
are available inside this.props
for class based components. you don't need a constructor
here
class title extends component {
render() {
const {name, title } = this.props
return (
<div classname="product-title">
{name} <strong>{title}</strong>
</div>
);
}
}
if i write that class based component to function based component we need to do it this way
function title({ name, title })
why do we need brackets to wrap name and title there?
this is a pattern called destructuring assignment which makes it possible to unpack values from arrays, or properties from objects, into distinct variables
you can pass an object
as parameter and only destructure it inside the function's body, or directly in the declaration
const user = {name: 'john', surname: 'doe'}
loguser(user)
const loguser = user =>{
const { name, surname } = user
console.log(name, surname)
}
is the equivalent of
const loguser = ({ name, surname }) => console.log(name, user)
since the only argument received by a functional component is props
you can pass it like
<child foo='bar' />
and directly destructure the argument from props
object
const child = ({ foo }) => <span> {foo} </span>
Source: stackoverflow.com
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