Choosing Between Array, Dictionary and Set
Performance characteristics and the right collection type for each scenario.
Welcome
Swift's three built-in collections — Array, Dictionary, and Set — each have distinct strengths. Choosing the right one impacts both correctness and performance.
Array: Ordered Sequences
Use `Array` when:
• Order matters
• You need random index access `O(1)`
• Duplicates are allowed
• You iterate sequentially
```swift
let steps = ["boil","add tea","steep","drink"]
```
All lessons in this course
- Dictionary CRUD and Subscript Access
- Iterating and Transforming Dictionaries
- Set Operations: Union, Intersection, Difference
- Choosing Between Array, Dictionary and Set