如何添加「和」逗號分隔字符串

Question

如果我有一個像"one, two, three"一個字符串是什麼辦法如果字符串包含一個項目則沒有and需要將其轉換爲"one, two, and three"

。

Answer 1

下面就來處理這種情況有兩種1，2，3 +字情況的方式：

def doIt(string) { 
    def elements = string.split(', ') 

    switch(elements.size()) { 
     case 0: 
      '' 
      break 
     case 1: 
      elements[0] 
      break 
     case 2: 
      elements.join(" and ") 
      break 
     default: 
      new StringBuilder().with { 
       append elements.take(Math.max(elements.size() - 1, 1)).join(', ') 
       append ", and " 
       append elements.last() 
      }.toString() 
      break 
    } 
} 

assert doIt("one, two, three, four") == "one, two, three, and four" 
assert doIt("one, two, three") == "one, two, and three" 
assert doIt("one, two") == "one and two" 
assert doIt("one") == "one" 

Answer 2

試試這個：

def fun(s) { 
    def words = s.split(', ') 
    words.size() == 1 ? words.head() : words.init().join(', ') + ', and ' + words.last() 
} 

assert fun("one, two, three") == "one, two, and three" 
assert fun("one") == "one"