Closure expression syntax:
{ (parameters) -> <return type> in
<statements to be executed>
}
- The parameters of closure expression can be of any type such as tuples, in-out parameters, variadic parameters with a name.
- The parameters cannot have a default value.
- The in keyword indicates that the declaration pf parameters and return type pf closure expression is done and the closure body containing executable statements have begun.
- The entire closure expression is contained inside a pair of curly braces { closure expression }.
