21 questions for “Iterators & yield return”

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21 questions in 3 technologies

#	Question	Technology	Topic	Level
1	What does 'yield return' do inside a method, and how does it turn an ordinary method into an iterator? C# › Iterators & yield return	C#	Iterators & yield return	Beginner
2	Why is a method using 'yield return' considered LAZY, and what does that mean for when its code actually executes? C# › Iterators & yield return	C#	Iterators & yield return	Beginner
3	How would you implement a custom IEnumerable<T> on your own class using yield return, letting it support foreach? C# › Iterators & yield return	C#	Iterators & yield return	Intermediate
4	How does 'yield break' work, and how does it differ from a plain 'return' statement inside a regular method? C# › Iterators & yield return	C#	Iterators & yield return	Intermediate
5	How would you implement a custom lazy 'Where' and 'Select' from scratch using yield return, mirroring how LINQ actually works internally? C# › Iterators & yield return	C#	Iterators & yield return	Advanced
6	How would you implement infinite lazy sequence generation using yield return, and why is this safe despite never 'finishing'? C# › Iterators & yield return	C#	Iterators & yield return	Advanced
7	How would you combine yield return with async/await to build an IAsyncEnumerable<T>-producing async iterator method? C# › Iterators & yield return	C#	Iterators & yield return	Advanced
8	How does an iterator method interact with try/finally, and when does the finally block actually execute given the method's lazy, on-demand nature? C# › Iterators & yield return	C#	Iterators & yield return	Intermediate
9	How does the compiler-generated state machine for an iterator method actually work internally, and what class does it implement? C# › Iterators & yield return	C#	Iterators & yield return	Advanced
10	How would you write a custom iterator that safely handles resource cleanup for a lazily-enumerated database cursor, ensuring the connection is closed even if enumeration is abandoned early? C# › Iterators & yield return	C#	Iterators & yield return	Advanced

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