Collection types comparison
- Basic example
- Example with explicit type annotation
- Empty example
- Order
- Unique values?
- See also
- Further reading
Basic example
| Arrays | let numbers = [1, 2, 3, 4] |
| Sets | let numbers: Set = [1, 2, 3, 4] |
| Dictionaries | let points = ["Ava": 150, "Eve": 275, "Kim": 115] |
Example with explicit type annotation
| Arrays | let numbers: [Int] = [1, 2, 3, 4] |
| Set | let numbers: Set<Int> = [1, 2, 3, 4] |
| Dictionaries | let points: [String: Int] = ["Ava": 150, "Eve": 275, "Kim": 115] |
Empty example
| Arrays | let numbers: [Int] = [] or let numbers = [Int]() |
| Set | let numbers: Set<Int> = [] or let numbers = Set<Int>() |
| Dictionaries | let points: [String: Int] = [:] or let points = [String: Int]() |
Order
| Arrays | Arrays are ordered, each element has its own index. |
| Set | Sets are unordered. |
| Dictionaries | Dictionaries are unordered. |
Unique values?
| Arrays | Can have repeating values. |
| Set | May not have repeating values. Each value is unique. |
| Dictionaries | Keys are unique but values can be repeating. |
