return

Since everything is an expression, return statements at the end of functions and closures can be omitted.

Angle allows return type polymorphism

The return type of a function is denied by the as keyword:
fib i as int:= if i<2 : 1 else fib(i-1) + fib i-2

Interestingly if the last parameter is untyped, the as keyword also weakly hints at the parameter type.

Different list separators have different bindings: While 1,2,3 binds as one expression, 1;2;3 yields the last element as return value.

A little return top can be specified either c-style in front of the function name or swift style after the function name with the optional keyword as -> or :

// preferred wasp style:
to calculate number a, number b as real:
    return a + b * 2.0

// redundant acceptable syntaxes:
real calculate(int a, real b){ // C-style
    return a + b * 2.0
}

fun calculate(a: int, b: real) -> real {
    return a + b * 2.0
}

fun calculate(a as int, b as real) as real {
    return a + b * 2.0
}

fun calculate(a: int, b: real) : real {
    return a + b * 2.0
}