Depends on the language I guess. I read it as "repeat the string Hello thrice and then add a comma and space". It's not really clear that "repeat" returns a l

Depends on the language I guess. I read it as "repeat the string Hello thrice and then add a comma and space". It's not really clear that "repeat" returns a list. A C# equivalent would be: String.Join(", ", Enumerable.Repeat("Hello", 3)) Here it's easier to see that Repeat returns an Enumerable object. Using an Extension Method, it's easy to see how someone could mistake the output: https://ideone.com/DuIvZN https://ideone.com/DuIvZN