Swift：如何将一个字符串数组拆分成多个匹配值数组？

let names = ["Aaron","Alice","Bob","Charlie","CHelsea","David"]

var result: [[String]] = []
var prevInitial: Character? = nil
for name in names {
    let initial = name.characters.first
    if initial != prevInitial {  // We're starTing a new letter
        result.append([])
        prevInitial = initial
    }
    result[result.endIndex - 1].append(Name)
}

print(result)  // [["Aaron","Alice"],["Bob"],["Charlie","CHelsea"],["David"]]