Csharp/CSharp Tutorial/LINQ/Aggregate

Aggregate and Sum

using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
public class MainClass {
    public static void Main() {
        IEnumerable<int> intSequence = Enumerable.Range(1, 10);
        foreach (int item in intSequence)
            Console.WriteLine(item);
        int sum = intSequence.Aggregate(0, (s, i) => s + i);
        Console.WriteLine(sum);
    }
}

Aggregate for string length

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
    class Program
    {
        static void Main(string[] args)
        {
            string[] curries = { "abc", "ab", "abcd" };
            Console.WriteLine(curries.Aggregate<string, string, int>(
                "Some curries:",
                (a, b) => a + " " + b,
                a => a.Length));
        }
    }

Aggregate Prototype

using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
public class MainClass {
    public static void Main() {
        int N = 5;
        IEnumerable<int> intSequence = Enumerable.Range(1, N);
        foreach (int item in intSequence)
            Console.WriteLine(item);
        int agg = intSequence.Aggregate((av, e) => av * e);
        Console.WriteLine("{0}! = {1}", N, agg);
    }
}

Aggregate string and int value

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
    class Program
    {
        static void Main(string[] args)
        {
            string[] curries = { "abc", "abcd", "ab" };
            Console.WriteLine(curries.Aggregate<string, int>(0,(a, b) => a + b.Length));
        }
    }

Aggregate three values

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
    class Program
    {
        static void Main(string[] args)
        {
            string[] curries = { "abc", "abcd", "ab" };
            Console.WriteLine(curries.Aggregate<string, string, string>(
                "curries:",
                (a, b) => a + " " + b,
                a => a));
        }
    }

Aggregate two string values

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
    class Program
    {
        static void Main(string[] args)
        {
            string[] curries = { "abc", "abcd", "ab" };
            Console.WriteLine(curries.Aggregate((a, b) => a + " " + b));
        }
    }

Use Aggregate on an array

using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using System.Linq;
public class MainClass {
    public static void Main() {
        int[] numbers = { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
        var query = numbers.Aggregate((a, b) => a * b);
    }
}

Use Aggregate on an array with tenary operator

using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using System.Linq;
public class MainClass{
   public static void Main(){
       int[] numbers = { 9, 3, 5, 4, 2, 6, 7, 1, 8 };
       var query = numbers.Aggregate(5, (a,b) => ( (a < b) ? (a * b) : a));
    }
}