gistfile1.java

obj.registerMethod(obj.runtime.newJavaMethod("compares this symbol against the argument, returning -1, 0 or 1 based on which one is lexically larger", new TypeCheckingJavaMethod("<=>") {
                private final TypeCheckingArgumentsDefinition ARGUMENTS = TypeCheckingArgumentsDefinition
                    .builder()
                    .receiverMustMimic(obj.runtime.symbol)
                    .withRequiredPositional("other")
                    .getArguments();

                @Override
                public TypeCheckingArgumentsDefinition getArguments() {
                    return ARGUMENTS;
                }

                @Override
                public Object activate(IokeObject method, Object on, List<Object> args, Map<String, Object> keywords, IokeObject context, IokeObject message) throws ControlFlow {
                    Object arg = args.get(0);

                    if(!(IokeObject.data(arg) instanceof Symbol)) {
                        arg = IokeObject.convertToSymbol(arg, message, context, false);
                        if(!(IokeObject.data(arg) instanceof Symbol)) {
                            // Can't compare, so bail out
                            return context.runtime.nil;
                        }
                    }
                    return context.runtime.newNumber(Symbol.getText(on).compareTo(Symbol.getText(arg)));
                }
            }));