The parameter name added in the jobs method can't be optional, otherwise all jobs would be returned. Being said so, with the suggestion you proposed, I managed to filter the jobs providing a regular ...

Unexpected error thrown in TypeScript function with optional parameter and default value. The error is thrown even when no error is explicitly passed as an argument.

Python 3 introduced the idea of "type annotations," and as of Python 3.6, you can annotate variables, not just function parameters and return values. The idea is that you can put a colon (:) and then ...