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 an `OrderByOccurrences` method

For this exercise, let's stop talking about movies. We've covered everything we need to solve this exercise so far in this chapter.

> **Author’s Note**: This is an interview question I got when applying for my last position as a software engineer.

Write an `OrderByOccurrences` method to sort a collection of numbers by the frequency of occurrences of its elements.

For example, the list `[3,2,2,3,3,1]` after sorted  by occurrences would be `[1,2,2,3,3,3]` since 1 appears once; 2, twice; and 3, three times. If two numbers have the same frequency, they should be in ascending order.

To complete this exercise, fill in the body of the `OrderByOccurrences` method.

Getting Started

LINQ Method: Where

Common LINQ Methods

Syntax & Pitfalls

Refactor with LINQ

What's New in LINQ?

Wrap-up!

Exercise: Sort by Occurrences

Write an `OrderByOccurrences` method

Exercise: Sort by Occurrences

Write an OrderByOccurrences method

Write an `OrderByOccurrences` method