Lambda in C#

February 2, 2022 C#

In this post, you will learn how to work with lambda so that you can use that same knowledge and thus evolve.

lambda is used in the creation of anonymous functions and these are so called because they are not declared with the terms of creating a typical function;
in short, lambda’s main objective is to simplify certain and certain functions, and these often do not use the term “return” but rather an expression;
the LINQ (Language-Integrated Query) translated to the letter represents the queries integrated to the language.

using System;
using System.Linq;

namespace Base {
  class Lambda {
    private int[] numbers = new int[] {
      1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11
    };

    public void Run() {
      /*
        Console.WriteLine($"Total of even numbers: {CountEvenNumbers()}");
        Console.WriteLine($"Total of odd numbers: {CountOddNumbers()}");
      */

      Console.WriteLine($"Total of even numbers: {numbers.Count(number => number % 2 == 0)}");
      Console.WriteLine($"Total of odd numbers: {numbers.Count(number => number % 2 != 0)}");
    }

    private int CountEvenNumbers() {
      var counter = 0;

      foreach (var number in numbers) {
        if (number % 2 == 0)
          counter++;
      }

      return counter;
    }

    private int CountOddNumbers() {
      var counter = 0;

      foreach (var number in numbers) {
        if (number % 2 != 0)
          counter++;
      }

      return counter;
    }
  }
}

/*
  Total of even numbers: 5
  Total of odd numbers: 6
*/

Don’t forget to watch the video and you can always read this post in Portuguese.

Lambda in C#

Happy coding!