Lambda Expression

Lambda expression

it is an anonymous function that we can use to create a delegate type or tree expression
Instead of create a method, we give it a name and pass the name of this method to  the definition a delegate, we can use lambda expression to put code directly without create a method,give it the name and assign it to a delegate

Syntax 

(parameters the input)=>expression

(parameters the input)=>{sentence};

Assign a lambda expression to a delegate

Lambda expression as an argument type<Func>

Func, represent method that can return something value, for example: Define a delegate for methods that receive  one parameters and return a  type
Func<int, bool> define a delegate with input parameters and return type .
in the example the input is a int and return type is bool

When we invoke, return true or false to point if the  parameter of input is equal a 5

For Example:

Test result

For Examples

Lambda expression to count  odd numbers that has a array 

we need the library "System.LINQ".

Test result