Category: Uncategorized

Weird Snippet to Divide an Array [ruby]

eduardofv

Dividing an array of n elements into pieces subarrays is a little bit trickier than it seems. Each subarray will contain chunk_size = n / pieces elements and n % pieces will remain unassigned, and need to be distributed to the subarrays. You can do this in many ways, but in this case we will assign the first remaining element to the first subarray, and so on. So the first n%pieces subarrays will contain n/pieces+1 elements.

def chunk_array(a,pieces)
  cs = a.length / pieces #chunk size
  r = -1*(a.length%pieces) #remaining elements to be asigned to a chunk
  (0..pieces-1).map{|i| r+=1; a[i*cs..(i+1)*cs-1] + (r<1 ? a[r-1..r-1] : [])}
end

C# & Linq Functional Style – Simple XML Parsing

eduardofv

With things like this, C# is regaining my attention. Parse a simple XML to a string array containing only the child elements defined in an other string array: 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml.Linq;

namespace PruebaLinqFuncional
{
    class Program
    {
        public static List ParseXML(string xml, string objectName, string[] dataToParse)
        {
            //Programacion funcional en C# :O

            /*
            return XDocument.Parse(xml).Descendants(objectName).Select((element) =>
            {
                var lst = new List();
                foreach (string field in dataToParse)
                    lst.Add(element.Element(field).Value);
                return lst.ToArray();
            }).ToList();
             */

            return XDocument.Parse(xml).Descendants(objectName).Select( (element) =>
            {
                return dataToParse.Select( (field) => 
                { 
                    return element.Element(field).Value; 
                }).ToArray();
            }).ToList();
        }

        static void Main(string[] args)
        {
            var xml = @"

  string-value
  string-value
  int-value
  string-value
  
    
      Mi_URL_Uno
      Mi_Blob_Uno
      date/time-value
      etag
      size-in-bytes
      blob-content-type
      
      
    
    
      Mi_URL_Dos
      Mi_Blob_Dos
      date/time-value
      etag
      size-in-bytes
      blob-content-type
      
      
    
  
  
    blob-prefix
  
  
";


            foreach (var stra in ParseXML(xml, "Blob", new string[] { "Url", "Name" }))
                Console.WriteLine(string.Join(",", stra));

            Console.ReadLine();
        }
    }
}