Lambda's you so crazy

lambdas.java

    @Override
    public Operation operate(final Object token, Environment env) {

        final int value = verifyAndEvaluate(token, env);
        
        switch (op) {
            case ADD:
                return ((nextToken, env2) -> (value + verifyAndEvaluate(nextToken, env2)));

            case SUB:
                return ((nextToken, env2) -> {
                    return value - verifyAndEvaluate(nextToken, env2);
                });
            case DIV:
                return ((nextToken, env2) -> {
                    return value / verifyAndEvaluate(nextToken, env2);
                });
            case MOD:
                return ((nextToken, env2) -> {
                    return value % verifyAndEvaluate(nextToken, env2);
                });
            case GT:
                return ((nextToken, env2) -> {
                    return value > verifyAndEvaluate(nextToken, env2);
                });
            case LT:
                return ((nextToken, env2) -> {
                    return value < verifyAndEvaluate(nextToken, env2);
                });
            case MULT:
                return ((nextToken, env2) -> {
                    return value * verifyAndEvaluate(nextToken, env2);
                });
            default:
                throw new AssertionError(op.name());
        }
    };