React Newline to break (nl2br)

Because you know that everything in React is functions, you can't really do this

this.state.text.replace(/(?:\r\n|\r|\n)/g, '<br />')

Since that would return a string with DOM nodes inside, that is not allowed either, because has to be only a string.

You then can try do something like this:

{this.props.text.split(“\n”).map(function(item) {
return (
{item}
<br/>
)
})}

That is not allowed either because again React is pure functions and two functions can be next to each other.

tldr. Solution

{this.props.text.split('\n').map(function(item, key) {
return (
<span key={key}>
{item}
<br/>
</span>
)
})}

Now we're wrapping each line-break in a span, and that works fine because span’s has display inline. Now we got a working nl2br line-break solution.

And ES6 version

{this.props.text.split('\n').map((item, key) => {
return <span key={key}>{item}<br/></span>
})}