Lec 23 Design Patterns
- Lists
- Accumulator pattern (add up a sequence of items)
- Data handling
- Mapping, filtering, merging DFs
- Design patterns:
- Independent of programming language
- Flexible/Easily modifiable
- Provide a common vocab to communicate "blueprints"
- Data pull:
- consumer knows about producer
- Producer has method consumer can call
- Consumer asks producer for data
- Observer pattern:
- Producer provides notification when data changes
- AKA Listener pattern, publish-subscribe (MQTT!)
- Subject (observee) keeps list of who to notify
- Distance must be defined per design pattern
- Euclidean
- Number of minutes it takes to travel
- Cost of travel
- Proportion of travelers