Join Scott Gardner for an in-depth discussion in this video Sequences and collections, part 1, part of Swift 3 Essential Training: Beyond the Basics.
- [Narrator] There are several convenience methods…for working with collections or sequences.…But before I get into that,…let me explain the difference…between a sequence and a collection.…A sequence is a simple list of values.…It can be iterated over…such as in a for-in loop.…However, a sequence should generally…only be iterated for one time,…because the sequence type…makes no guarantee that the iteration…won't be destructive.…A collection is a sequence.…It inherits from sequence.…Additionally a collection's elements…are accessible via subscripting.…It could be iterated over multiple times.…
And it's elements can be accessed multiple times…via it's subscript index.…For example, a range is a sequence…versus an array is a collection.…You can't index into a range,…because it's only a sequence.…But you can index into an array,…because it's a collection.…You can iterate over a sequence though,…however, you cannot assume…that a sequence won't be consumed…during iteration.…
So you should avoid repeatedly iterating…over the same sequence.…
- Adding source files, resources, links, and literals
- Adding pages to a playground
- Using overflow operators and bitwise operators
- Using ranges with strings
- Creating complex sequences
- Chaining higher-order functions
- Defining lazy properties
- Using failable initializers
- Mutating methods
- Working with singletons
- Nesting function types
- Creating error types and recursive enumerations
- Extending concrete types
- Referencing selectors and key paths
- Working with protocol-oriented programming
- Defining class-only protocols and optional protocols
- Using option sets, type checking, and casting operators
Skill Level Intermediate
Core Data for iOS and macOS Enterprise Developerswith Jon Bott1h 46m Intermediate
Distributing Your iOS App for Testing with TestFlightwith Ron Buencamino35m 10s Intermediate
iOS App Development: Test-Driven Developmentwith Harrison Ferrone2h 14m Intermediate
3. Strings and Characters
4. Sequences and Collections
5. Control Flow
6. Value and Reference Types
9. Access Control
Understand access control3m 47s
Next steps1m 2s
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