dongmu2174 2016-04-19 16:36 采纳率: 100%
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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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1条回答 默认 最新

  • douyalin0847 2016-04-19 16:47
    关注

    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

    本回答被题主选为最佳回答 , 对您是否有帮助呢?
    评论

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