Imagine a brand new robot which can follow basic instructions and learn new stuff.
Instructions
- Find cloth / broom
- Pick it up
- Dust surfaces
Functions
- Clean object means follow the above instructions for given object
- Clean door
- Clear window …
Recursion
- Clean object means if object has smaller objects, clean each small object else clean object
- Clean room
Higher order functions
- Begin task means perform the task for all objects
- Spraying water on object means to sprinkle water on object
- Drying object means to clean object
- Begin spraying
- Begin drying
Note: doesn’t include closures.