## "meta"-tools

|                                         | Julia                   | Python                      | R                          |
|--------------------|------------------|------------------|------------------|
| Documentation                           | `?obj`                  | `help(obj)`                 | `?obj` , `help(obj)`       |
| Object content                          | `dump(obj)`             | `print(repr(obj))`          | `str(obj)`                 |
| Exported functions                      | `names(FooModule)`      | `dir(foo_module)`           | `ls("package:foo_module")` |
| List function signatures with that name | `methods(myFun)`        |                             | `methods(myFun)`           |
| List functions for specific type        | `methodswith(SomeType)` | `dir(SomeType)`             | `methods(SomeType)`        |
| Where is ...?                           | `@which func`           | `func.__module__`           |                            |
| What is ...?                            | `typeof(obj)`           | `type(obj)`                 | `class(obj)`               |
| Is it really a ...?                     | `isa(obj, SomeType)`    | `isinstance(obj, SomeType)` | `is(obj, SomeType)`        |

## debugging

|                   |                                                                                                                                 |
|------------------------------------|------------------------------------|
| `@run sum(5+1)`   | run debugger, stop at error/breakpoints                                                                                         |
| `@enter sum(5+1)` | enter debugger, dont start code yet                                                                                             |
| `@show variable`  | prints: variable = variablecontent                                                                                              |
| `@debug variable` | prints only to debugger, very convient in combination with `>ENV["JULIA_DEBUG"] = ToBeDebuggedModule` (could be `Main` as well) |