Strings in swift
summary
Explains that Unicode assigns code points but encoding is variable‑length so utf-8 view uses 1–4 bytes (example string totals 11 bytes: W 1, é 2, 💜 4, 📱 4), and visually single characters are grapheme clusters which can combine multiple scalars. Swift strings are Unicode‑aware, normalize for equality, expose utf8/utf16/scalars/characters views, use copy-on-write and substrings that share storage (beware long‑lived substring memory retention). Complexity: count/index O(n), append amortized O(1), copy O(1). Also covers bidirectional text and direction markers (U+200E/U+200F).
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chapters (9)
- 0:00The complexity of strings
- 2:23Defining string problems
- 3:52History and Unicode
- 6:24UTF-8 encoding explained
- 9:41Grapheme clusters
- 14:01Bi-directional text
- 19:18Swift string design
- 22:30Performance optimizations
- 26:43Concluding thoughts
