英文:
Golang: Stack multiple method calls on one line
问题
开始使用Go语言。
我正在尝试编写一个函数，将名字的第一个字母大写，然后将姓氏全部大写。
为什么我不能像下面这样堆叠方法调用？
（我之所以想在之前加上.ToLower是因为.Title只会将第一个字母大写，而不会改变其他字母）
package mainimport ("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}
英文:
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 mainimport ("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}
答案1
得分: 2
你可以尝试像这样做（根据你的用例进行修改，我不确定你想要的输出）：
type myString stringfunc 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}
顺便说一下，不使用链式调用也是可以的：
func nameCap(s1, s2 string) (str1, str2 string) {s1 = strings.ToLower(s1)s1 = strings.Title(s1)s2 = strings.ToUpper(s2)return s1, s2}
GoPlay链接：http://play.golang.org/p/BcJTuBRqbx
英文:
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 stringfunc 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}
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