ArraySizeCommand.java example

import java.util.List;

public class ArraySizeCommand extends Node
{
    public Parser parser;
    
    public ArraySizeCommand() {}
    
    public ArraySizeCommand(Parser parser)
    {
        this.parser = parser;
    }
           
    public Object eval()
    {
        List array = (List) parser.getVariable("array");        
        return array.size();
    }        
}