Unicode text operations

// Immutable built-in Unicode text; no import is required.
let text: String = "  café 🧪  "
let clean = text.trim()
print(clean)
print(clean.len())
print(clean.byte_len())
print(clean.get(index: 3))
print(clean.slice(start: 0, end: 4))
print(clean.find(needle: "🧪"))
print(clean.contains(needle: "café"))
print(clean.starts_with(prefix: "café"))
print(clean.ends_with(suffix: "🧪"))

let fields = "sample,,control,".split(separator: ",")
print(fields)
print(" | ".join(parts: fields))
print("banana".count(needle: "ana"))
print("banana".replace(old: "ana", new: "X"))
print("Straße".upper())
print("Straße".casefold() == "STRASSE".casefold())
print("A".repeat(count: 3))
print("study-".concat(other: String(42)))
print("sample " + String(true))
print("a".compare(other: "b"))
print(text)