Seems like an interesting effort. A developer is building an alternative Java-based backend to Lemmy’s Rust-based one, with the goal of building in a handful of different features. The dev is looking at using this compatibility to migrate their instance over to the new platform, while allowing the community to use their apps of choice.

  • Tom@programming.dev
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    9 months ago

    Null is terrible.

    A lot of languages have it available as a valid return value for most things, implicitly. This also means you have to do extra checking or something like this will blow up with an exception:

    // java example
    // can throw exception
    String address = person.getAddress().toUpperCase();
    
    // safe
    String address = "";
    if (person.getAddress() != null) {
        person.getAddress().toUpperCase();
    }
    

    There are a ton of solutions out there. Many languages have added null-coalescing and null-conditional operators – which are a shorthand for things like the above solutions. Some languages have removed the implicit nulls (like Kotlin), requiring them to be explicitly marked in their type. Some languages have a wrapper around nullable values, an Option type. Some languages remove null entirely from the language (I believe Rust falls into this, using an option type in place of).

    Not having null isn’t particularly common yet, and isn’t something languages can just change due to breaking backwards compatibility. However, languages have been adding features over time to make nulls less painful, and most have some subset of the above as options to help.

    I do think Option types are fantastic solutions, making you deal with the issue that a none/empty type can exist in a particular place. Java has had them for basically 10 years now (since Java 8).

    // optional example
    
    Class Person {
        private String address;
        
        //prefer this if a null could ever be returned
        public Optional<String> getAddress() {
            return Optional.ofNullable(address);
        }
        
        // not this
        public String getAddress() {
            return address;
        }
    

    When consuming, it makes you have to handle the null case, which you can do a variety of ways.

    // set a default
    String address = person.getAddress().orElse("default value");
    
    // explicitly throw an exception instead of an implicit NullPointerException as before
    String address = person.getAddress().orElseThrow(SomeException::new);
    
    // use in a closure only if it exists
    person.getAddress().ifPresent(addr -> logger.debug("Address {}", addr));
    
    // first example, map to modify, and returning default if no value
    String address = person.getAddress().map(String::toUpperCase).orElse("");