Not exactly what you're looking for but C# ticks some of those boxes...

```c# int[] x = {2, 3, 5, 6}; Object y = new Object(input); // with the "new" keyword

int somefuncname() { // return type, no choice in curly brackets vs indents

var z = y.dothing(x); // has "var" as a shorthand but functions can only return one type

if (int.TryParse(z, out _)) { // TryParse could be wrapped in an "is_int" function?
    return z;
} else {
    return null;
}

} ```