View Page Source for examples of converting Function Declarations into Arrow Function Expressions.
If your Arrow Function only takes a single argument you don't need parentheses.
You can't remove parentheses on functions with no or multiple arguments.
If you're using only one line of code, you don't need the return keyword.
It will always return the value of the statement without the use of the return keyword.
You can reduce the Arrow syntax further by removing the curly braces when you only have a single line of code in your Arrow Function.