Frank de Jonge wrote an article on how to structure to your functions to avoid the duplication of cleanup code. Spoiler: use
Cleaning up after yourself can be a tedious task. For example, closing file handlers after using them needs to be done. A programmer's life isn't all about the happy path. When things go pear-shaped you might end up duplicating cleanup code throughout your code. This is horrible, let's explore an alternative.
defer keyword from Go looks super nice.