What do these three dots in React do?

Question

What does the ... do in this React (using JSX) code and what is it called?

Answer 1

This a spread operator...

For example if you have an array first=[1,2,3,4,5] and another second=[6,7,8].

[...first, ...second] //result is [1,2,3,4,5,6,7,8]

The same can also be done with json objects.