What is a function?

A function is a block of code that performs a specific task. Functions are written in a standard format that allows them to be reused in different programs.

In React, a function is a component that can be reused in different parts of an application. Functions take an input and return an output. In React, the input is props and the output is JSX.

What is a react child?

In React, a component’s children are the contents between its opening and closing tags. So in the example above, the CustomButton component’s children are ‘Click Me’, which is just a simple string.

In some cases though, you might want a component to render something other than a simple string. maybe you want it to render a react element, like another component. To do that, you pass in a function as the component’s child. That function will get called with whatever props you pass to the component, and it should return a react element.

Why are functions not valid as a react child?

In React, you can pass a function as a child to another component. However, this is not always advisable. Functions are not valid as React children. This means that they cannot be passed as props to child components.

There are two reasons for this:

1) Functions are not guaranteed to be have been created when the component is rendered. This means that they may not be available to the child component when it needs them.

2) Functions can return different values each time they are called. This means that the child component may receive different props each time it renders, which can lead to unexpected behavior.

What are some alternatives to using functions as a react child?

There are several ways to achieve the same result without using functions as a react child. The first is to bind the function to the component:

class MyComponent extends React.Component {
constructor(props) {
super(props);
this.handleClick = this.handleClick.bind(this);
}

handleClick() {
// Do something!
}

render() {
return (
Click me!
);
}
}
The second is to use an arrow function:
class MyComponent extends React.Component {

handleClick = () => { // Do something! };

render() { return ( Click me! ); } }