foo.swift

func myFunctionDoubleVariables (thing: Thing?) {
    let foo_ = thing?.getAFoo()
    if foo_ == nil {
     return;
    }
    let foo = foo_!
    foo.bar()
    foo.dostuff()
    foo.morestuff()
}

func myFunctionExclamationsForDays (thing: Thing?) {
    let foo = thing?.getAFoo()
    if foo == nil {
        return
    }
    foo!.bar()
    foo!.dostuff()
    foo!.morestuff()
}

func myFunctionNesting (thing: Thing?) {
    if let foo == thing?.getAFoo() {
        foo!.bar()
        foo!.dostuff()
        foo!.morestuff()
    }
}

func myFunctionAwesome (thing: Thing?) {
    let foo = thing?.getAFoo ?? return
    foo.bar()
    foo.dostuff()
    foo.morestuff()
}