100 Interactive LINQ Puzzles

About these LINQ puzzles

• 5 interactive quizzes with 20 puzzles each, for max 60 minutes per quiz, with a 70% passing score.

• Puzzles are presented as either alternative coding problems or as single/multiple-choice questions.

• All puzzles have detailed answers, explanations and references.

• More than 50 coding problems have one-click solutions in live C# code you can run online or change as you wish.

• The quizzes are from beginner to expert, from easy to intermediate to difficult, great for Certification Exams.

• Last quiz has problems asked in real Job Coding Technical Interviews, described on LeetCode.

• Dozens of problems are inspired from the most voted questions on Stack Overflow.

What it's been covered

• We covered most if not all Enumerable standard query operators.

• We focused on LINQ for Objects and the fluent method notation, some query notation and no LINQ for XML.

• We try to improve in short time and in a funny manner your essential knowledge and problem solving in LINQ.

• Our strategy: skip the trivial, avoid the clutter, but remember the basics and repeat what really matters.

• You must be already proficient in C# and comfortable with lambdas, extension methods and other advanced techniques.

• You must already know the basics of LINQ, as we don't teach LINQ here: these puzzles help you get better in LINQ.

How to use these puzzles

• Start with the first quiz, with Easy Basic LINQ. It tests your basic knowledge on LINQ, with essential questions.

• Stop the quiz anytime, if you're not patient enough to go over all 20 questions.

• Once done, click Review Questions and check both the right and wrong choices for each puzzle.

• Read the detailed Explanation for each puzzle. Many end with some important highlighted hint.

• Run and customize the live coding solution, if there is one under Try It Here.

• Go through the recommended external References to learn more.

• Continue with the other quizzes, in increased level of difficulty.

• Knowledge-based questions are gradually replaced by coding problems in LINQ, with multiple alternatives.

• Repeat all quizzes and check your marks: you should start seeing better times and higher passing scores. Good luck!

100 LINQ PUZZLES is also available as a book on Amazon.