Java let form

Let.java

// implementation
<T> void let(T value, Consumer<T> consumer) {
    consumer.accept( value );
}

// example usage
let(userService.findUser(), user -> {
    // do something to the user
    if (!user.isValid()) {
        userService.removeUser(user);
    }
});

Here is what could be achieved with lambda:

((Function<User, Void>) (user) -> {
    // do something to the user
    if (!user.isValid()) {
        userService.removeUser(user);
    }
    return null;
}).apply(userService.findUser());

Agh 😯 Ugly!

Sadly, something like that won't work:

((user) -> {
    // do something to the user
    if (!user.isValid()) {
        userService.removeUser(user);
    }
})(userService.findUser());