Question

How to group string array by string length using array.ToLookup() in C#

Answer 1

using System;
using System.Linq;

namespace ConsoleApplication_C_Sharp
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] array = { "php", "c#", "c++", "java", "sql", "cobol", "python", "basic" };

            var lookup = array.ToLookup(item => item.Length);

            int i = 1;
            foreach (var group in lookup)
            {
                Console.WriteLine("\nGroup: " + i++);
                foreach (string s in group)
                    Console.WriteLine(s);
            }
        }
    }
}


/*
run:
     
Group: 1
php
c++
sql

Group: 2
c#

Group: 3
java

Group: 4
cobol
basic

Group: 5
python
 
*/

 

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