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Posted 14 Dec 2011
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Understand Lambda Expressions in 3 Minutes

, 5 Mar 2013
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Lambda expressions short tutorial


A lambda expression is an anonymous function and it is mostly used to create delegates in LINQ. Simply put, it's a method without a declaration, i.e., access modifier, return value declaration, and name.

Convenience. It's a shorthand that allows you to write a method in the same place you are going to use it. Especially useful in places where a method is being used only once, and the method definition is short. It saves you the effort of declaring and writing a separate method to the containing class.


Lambda expressions should be short. A complex definition makes the calling code difficult to read.

Lambda basic definition: Parameters => Executed code

  1. What is a Lambda Expression?
  2. Why do we need lambda expressions? (Why would we need to write a method without a name?)
    1. Reduced typing. No need to specify the name of the function, its return type, and its access modifier.
    2. When reading the code, you don't need to look elsewhere for the method's definition.
  3. How do we define a lambda expression?

Simple Example

n => n % 2 == 1 
  • n is the input parameter
  • n % 2 == 1 is the expression

You can read n => n % 2 == 1 like: "input parameter named n goes to anonymous function which returns true if the input is odd".

Same example (now execute the lambda):

List<int> numbers = new List<int>{11,37,52};
List<int> oddNumbers = numbers.where(n => n % 2 == 1).ToList();
//Now oddNumbers is equal to 11 and 37

That's all, now you know the basics of Lambda Expressions.

  • I didn't mention expression trees/run time advantages of lambda expression due to limited scope.


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Dan Avidar
United States United States
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Comments and Discussions

QuestionMy vote of 5 Pin
Member 323305517-Dec-13 19:53
memberMember 323305517-Dec-13 19:53 
GeneralThe simplest article of confused topic so far. Thank You Pin
Deepak K Gupta29-Sep-13 10:06
memberDeepak K Gupta29-Sep-13 10:06 
GeneralMy vote of 5 Pin
Tarun Mangukiya2-Sep-13 4:57
memberTarun Mangukiya2-Sep-13 4:57 
GeneralMy vote of 5 Pin
Edgar ramirez24-Aug-13 7:54
professionalEdgar ramirez24-Aug-13 7:54 
QuestionSorry... Pin
jhewitt999923-Aug-13 11:45
memberjhewitt999923-Aug-13 11:45 
AnswerRe: Sorry... Pin
Spong3bob8-May-15 12:57
memberSpong3bob8-May-15 12:57 
QuestionNice intro, but could expand Pin
ShaunnyBoy21-Aug-13 2:01
memberShaunnyBoy21-Aug-13 2:01 
QuestionNicely explained...Very thanks Pin
Chintan.Desai31-Jul-13 18:01
groupChintan.Desai31-Jul-13 18:01 
GeneralMy vote of 5 Pin
Brian A Stephens1-Jul-13 2:33
professionalBrian A Stephens1-Jul-13 2:33 
GeneralMy vote of 4 Pin
Adam Nain12-Jun-13 20:08
memberAdam Nain12-Jun-13 20:08 
GeneralMy vote of 5 Pin
Javier Prieto12-Jun-13 3:40
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QuestionMy vote of 5 Pin
vikram00110-Jun-13 21:37
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GeneralMy vote of 5 Pin
N_cooL5-Jun-13 21:55
memberN_cooL5-Jun-13 21:55 
QuestionUnderstand Lambda Expressions Pin
Endalew26-May-13 15:20
memberEndalew26-May-13 15:20 
GeneralMy vote of 5 Pin
_Vitor Garcia_12-May-13 22:26
member_Vitor Garcia_12-May-13 22:26 
Questionty Pin
25-Apr-13 13:10
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GeneralMy vote of 5 Pin
_duDE26-Mar-13 4:28
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GeneralMy vote of 5 Pin
memberKRISHNA ANIPINDI24-Mar-13 23:52 
GeneralMy vote of 5 Pin
GuyThiebaut18-Mar-13 6:27
memberGuyThiebaut18-Mar-13 6:27 
GeneralWell Explained Pin
PratimaG11-Mar-13 5:11
memberPratimaG11-Mar-13 5:11 
GeneralMy vote of 4 Pin
iAmit196-Mar-13 17:36
memberiAmit196-Mar-13 17:36 
QuestionVery well explained Pin
6-Mar-13 6:48
member6-Mar-13 6:48 
AnswerRe: Very well explained Pin
Dan Avidar6-Mar-13 7:20
memberDan Avidar6-Mar-13 7:20 
GeneralMy vote of 5 Pin
Omid Babaei6-Mar-13 0:33
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