Strings in Swift are far more sophisticated than they appear. Under the hood, Swift strings are Unicode-correct, which means they handle every human language, emoji, and special character properly. This chapter dives deep into how strings really work, including indexing, substrings, and encoding.
Strings Are Unicode
let greeting = "Hello"
let emoji = "Swift is fun! 🚀"
let chinese = "你好世界"
let combined = "e\u{0301}" // e + combining accent = e (one character, two scalars)Swift treats all of these correctly because it works at the level of grapheme clusters -- what humans perceive as individual characters.
Figure 1 — Unicode scalars (yellow) are raw code points; grapheme clusters (blue) group scalars into user-perceived characters (e.g., é = A + combining accent); Swift Strings (green) are sequences of grapheme clusters. This is why Swift handles every language, emoji, and accent correctly.
Full content for this chapter will be added in a future update. The complete article covers String.Index, substrings, raw strings, multi-line strings, character properties, UTF-8 and UTF-16 views, and string performance.
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