What is appliance and how to use lambda expressions? [duplicate]

Answer 1

Lambdas bring functional programing to C#. They are anonymous functions that can be passed as values to certain other functions. Used most in LINQ.

Here is a contrived example:

List myInts = GetAll();
IEnumerable evenNumbers = myInts.Where(x => x % 2 == 0);

Now when you foreach through evenNumbers the lamda

x=> x % 2 == 0

is then applied as a filter to myInts.

They become really useful in increasing readability to complicated algorithms that would have many nested IF conditionals and loops.