dongmu2174
2016-04-19 16:36
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Golang:在一行上堆叠多个方法调用

Getting started with Go. I'm trying to write a function that title cases a first name then caps the second. Why can't I stack method calls as below?

(The reason why I want to put a .ToLower before is because the .Title only caps the first letter leaving the rest unchanged)

package main

import (
  "fmt"
  "strings"
)

func main() {
  firstName := "mElVIn"
  lastName := "themelvINATor"
  fmt.Println(nameCap(firstName, lastName))
}

func nameCap(s1, s2 string) (str1, str2 string) {
  s1 = strings.ToLower(s1).Title(s1)
  s2 = strings.ToUpper(s2)

  return s1, s2
}

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Go入门。 我正在尝试编写一个函数,该函数的标题为第一个名字,然后第二个为大写 。 为什么不能按以下方式堆叠方法调用?

(我想在前面放置.ToLower的原因是因为.Title仅将第一个字母封顶,而其余字母不变 )

 包main 
 
import(
“ fmt” 
“ strings” 
)
 
func main(){
 firstName:=“ mElVIn  “ 
 lastName:=” themelvINATor“ 
 fmt.Println(nameCap(firstName,lastName))
} 
 
func nameCap(s1,s2 string)(str1,str2 string){
 s1 = strings.ToLower  (s1).Title(s1)
 s2 =字符串。ToUpper(s2)
 
返回s1,s2 
} 
   
 
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1条回答 默认 最新

  • douyalin0847 2016-04-19 16:47
    已采纳

    You could try to do something like this (modify for your use case, I'm not entirely sure the output you're trying to get):

    type myString string
    
    func main() {
        firstName := "mElVIn"
        lastName := "themelvINATor"
        fmt.Println(nameCap(firstName, lastName))
    }
    
    func (s myString) Title(ss string) string {
        return strings.Title(ss)
    }
    
    func nameCap(s1, s2 string) (str1, str2 string) {
        s1 = myString(strings.ToLower(s1)).Title(s1)
        s2 = strings.ToUpper(s2)
    
        return s1, s2
    }
    

    FWIW, there's nothing wrong with doing it without chaining:

    func nameCap(s1, s2 string) (str1, str2 string) {
        s1 = strings.ToLower(s1)
        s1 = strings.Title(s1)
        s2 = strings.ToUpper(s2)
    
        return s1, s2
    }
    

    GoPlay: http://play.golang.org/p/BcJTuBRqbx

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