How do I use map and filter in C#?

How do I use map and filter in C#?

In C#, you can use LINQ to achieve map and filter functionalities. For mapping, you can use the Select method, and for filtering, you can use the Where method.

Can you give me an example of using Select and Where?

Sure! Here's an example:

var numbers = new List<int> { 1, 2, 3, 4, 5 };  
var squaredEvenNumbers = numbers.Where(n => n % 2 == 0).Select(n => n * n);

This code filters even numbers and then maps them to their squares.

What if I want to use these methods on a list of objects?

You can still use Select and Where on a list of objects. For example, if you have a list of Person objects, you can filter by age and map to names like this:

var people = new List<Person> { ... };  
var names = people.Where(p => p.Age > 18).Select(p => p.Name);