Function syntax

[Jomy10]

Example:

func someFunction(param: i32, * namedParam: i32, paramName namedParamExplicit: i32, opt OptionalNamedParam: i32?) -> i32 {}

// calling: 
let val = someFunction(5, namedParam: 4, paramNam: 6, opt: 78)
let val = someFunction(5, namedParam: 4, paramNam: 6) // opt will be `None` (enum)

another example:

func someFunc(opt optionalParam: i32 = 4) -> i32 { optionalParam }

let val = someFunc() // val = 4