What are some common mistakes in for-each loops?

What are some common mistakes in for-each loops?

Some common mistakes include modifying the collection while iterating, using the wrong variable type, and not handling null values.

Can you explain why modifying the collection is a mistake?

Modifying the collection during iteration can lead to unexpected behavior, such as skipping elements or throwing exceptions.

What should I do instead if I need to modify the collection?

You can create a copy of the collection or collect the changes in a separate list and apply them after the loop.

Are there any specific programming languages where this is more problematic?

Yes, languages like Java and C# can throw exceptions if you modify a collection while iterating over it, unlike Python which handles it differently.