Gain insights into LINQ in C#, learn about lambda expressions, explore common LINQ methods, avoid pitfalls, and refactor code to be more expressive and efficient.

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LINQ is the best feature in C#. If you’re interested in writing more expressive code to work with collections, this course is for you. In this course, you will learn about what LINQ is and what lambda expressions are. You will learn the most common LINQ methods and some common pitfalls to avoid when using LINQ. You will also write your first methods using LINQ and use LINQ to refactor some common constructs.

Getting Started with LINQ in C#

# Write a `HasAny` method

Now, it’s your turn!

Many of us have heard the phrase "Don’t reinvent the wheel"---meaning that we shouldn’t waste time recreating something that’s already been done. But, to better understand the `Any` method and practice extension methods, we’re going to do just that. Let's write our `Any` method and call it `HasAny`. For this exercise, don't use the real `Any` method.

To complete this exercise, follow the instructions in the comments. Fill in the body of the `HasAny` method in the `EnumerableExtensions.cs` file.

Reinvent the wheel to better understand the Any method.

Getting Started

LINQ Method: Where

Common LINQ Methods

Syntax & Pitfalls

Refactor with LINQ

What's New in LINQ?

Wrap-up!

Exercise: Implement Your Own Any Method

Write a `HasAny` method

Exercise: Implement Your Own Any Method

Write a HasAny method

Write a `HasAny` method