Swift Tutorial - Exploring Swift Sequences in Depth
summary
Deep dive into how Swift Sequences and Collections actually behave: shows concrete code for lazy sequences that avoid repeated array allocations in a 1,000,000-range pipeline (finding the first 100 even numbers containing “v” returns 12 then 726), demonstrates that lazy access recomputes unless materialized, uses unfoldSequence to stream a file line-by-line instead of loading 236,000 words into memory, builds a recursive sequence for filesystem traversal, implements a 2D grid, runs Game of Life, and draws a spirograph from 100,000 points while leveraging the Swift Algorithms package and collection(of: 1)/empty-collection optimizations.
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chapters (30)
- 0:00Introduction to sequences
- 1:25Iterator protocol basics
- 2:46Sequence extension methods
- 4:52Reduce and sequence extensions
- 5:57Lazy sequences explained
- 9:10Lazy vs non-lazy performance
- 11:58Collections vs sequences
- 13:22Collection protocol details
- 15:46Unordered collections
- 17:31Dictionary and set indexing
- 18:56Count and empty checks
- 20:58Subsequences and slicing
- 21:39Bidirectional collections
- 22:23Random access collections
- 23:26Unfold sequences
- 26:13Empty collection and collection of one
- 27:36Consuming sequences properly
- 29:45Flexible sequence parameters
- 30:26Swift Algorithms package
- 31:29Chain and windowing sequences
- 32:53Striding sequences
- 34:21Stride date sequences
- 36:29File line iteration
- 38:56Recursive sequences
- 42:25Conforming to sequence
- 45:562D grid collections
- 47:00Custom 2D grid implementation
- 50:11Window sequences for grids
- 51:35Spirograph with unfold sequence
- 55:22Summary and best practices
