Arrow functions and the use of parentheses () or {} or ({})

Question

I cannot understand why in the arrow functions we do not need to wrap the literal of arrow function in the ({}) braces, instead of in this exam

Answer 1

const add = ( a, b ) => ( a + b )

Is equivalent to

const add = ( a, b ) => { return a+b; }

When you use the () after your => it just automatically returns the values inside.

Edit: you can also ommit the () entirely, thanks to Tom Fenesh