In ReactJS, you can handle arrays and strings in different ways.

1. Arrays: An array in ReactJS is commonly used to store (and later display) a list of items. You can create an array in your component’s state, typically using the useState or this.state methods. Making use of the JavaScript `.map() function`, you can iterate over your array to generate a new array of JSX elements.

For example,

```
const numbers = [1, 2, 3, 4, 5];

const listItems = numbers.map((number) =>

{number}

);

ReactDOM.render(

{listItems}, document.getElementById(‘root’)
);
```
Don’t forget to assign a unique `key` prop to each child in an array or iterator, otherwise React will throw a warning.

1. Strings: Strings can be rendered directly in your JSX, and can also be passed as a prop to a child component. You can use them dynamically in your JSX code. For instance:

```
const name = ‘Josh Perez’;

const element =

Hello, {name}

;

ReactDOM.render( element, document.getElementById(‘root’)
);
```
Here, the `name` string is embedded in a JSX element using curly braces.

Please note that ReactJS XSS (Cross-site Scripting) protects from injection attacks. It means that you can safely embed user input in JSX, as it will be displayed as pure text and not as code.

How are arrays and strings handled in Reactjs?

Hello, {name}