The use of map in this example

Hey Everyone, I have a question in regards to the use of Map in the exercise.

Usually when I use Map in vanilla JavaScript, I always use the braces, especially if the method will have multiple lines. For example,

const numArr = [1, 2, 3, 4, 5]

const newArr = numArr.map(num => {
return num * 10
})

In the example above, I have used curly braces after the arrow in the map function.

In this exercise, Guil does not use curly braces, instead its the following:

const PlanetList = (props) =>{
  return(
    <div className="container">
      {props.planets.map(planet => 
        <Planet
        {...planet}
        key={planet.id}
        />
      )}
    </div>
  )
}

As you can see above, after the arrow there are no braces to encompass the Planet Component.

I was working through this exercise and because I had the curly braces, the app wouldn't load in the browser. One they where removed, it worked.

Thanks, Jiten.