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- let s = "Café du 🌍"
- let si = s.startIndex
- let ci = s.characters.startIndex
- si == ci // true
- let si2 = s.index(si, offsetBy: 3)
- let ci2 = s.characters.index(ci, offsetBy: 3)
- si2 == ci2 // true
- let si3 = s.index(after: si2)
- let ci3 = s.characters.index(after: ci2)
- si3 == ci3 // true
- let e1 = s[si2..<si3] // é
- let e2 = s[ci2..<ci3] // é
- let e3 = String(s.characters[si2..<si3]) // é
- let e4 = String(s.characters[ci2..<ci3]) // é
- e1 == e2 // true
- e1 == e3 // true
- e1 == e4 // true
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