[英]How to remove the last character of a string in Golang?
I want to remove the very last character of a string, but before I do so I want to check if the last character is a "+".我想删除字符串的最后一个字符,但在此之前我想检查最后一个字符是否为“+”。 How can this be done?如何才能做到这一点?
Builtin function is available now. 内置功能现在可用。 http://golang.org/pkg/strings/#TrimSuffix http://golang.org/pkg/strings/#TrimSuffix
Here are several ways to remove trailing plus sign(s). 这是删除尾随加号的几种方法。
package main
import (
"fmt"
"strings"
)
func TrimSuffix(s, suffix string) string {
if strings.HasSuffix(s, suffix) {
s = s[:len(s)-len(suffix)]
}
return s
}
func main() {
s := "a string ++"
fmt.Println("s: ", s)
// Trim one trailing '+'.
s1 := s
if last := len(s1) - 1; last >= 0 && s1[last] == '+' {
s1 = s1[:last]
}
fmt.Println("s1:", s1)
// Trim all trailing '+'.
s2 := s
s2 = strings.TrimRight(s2, "+")
fmt.Println("s2:", s2)
// Trim suffix "+".
s3 := s
s3 = TrimSuffix(s3, "+")
fmt.Println("s3:", s3)
}
Output: 输出:
s: a string ++
s1: a string +
s2: a string
s3: a string +
No builtin way. 没有内置的方式。 But it's trivial to do manually. 但是手动进行却很简单。
s := "mystring+"
sz := len(s)
if sz > 0 && s[sz-1] == '+' {
s = s[:sz-1]
}
Based on the answer of @KarthikGR the following example was added: 基于@KarthikGR的答案,添加了以下示例:
https://play.golang.org/p/ekDeT02ZXoq https://play.golang.org/p/ekDeT02ZXoq
package main
import (
"fmt"
"strings"
)
func main() {
fmt.Println(strings.TrimSuffix("Foo++", "+"))
}
returns: 返回:
Foo+
package main
import (
"fmt"
)
func main() {
s := "venga|ese|sabor|"
newString := ""
if len(s) > 0 {
newString = s[:len(s)-1]
}
fmt.Println(newString)
}
output: venga|ese|sabor output: 文加|塞|萨博
go playground: go游乐场:
https://go.dev/play/p/o9ExIEuU0SF https://go.dev/play/p/o9ExIEuU0SF
@llazzaro @llazzaro
A simple UTF compliant string trimmer is一个简单的 UTF 兼容字符串修剪器是
string([]rune(foo)[:len(foo)-1]))
So I'd go with所以我会用 go
f2 := []rune(foo)
for f2[len(f2)-1] == '+'{
f2 = f2[:len(f2)-1]
}
foo = string(f2)
https://go.dev/play/p/anOwXlfQWaF https://go.dev/play/p/anOwXlfQWaF
I'm not sure why the other answers trimmed the way that they do, because they're trimming bytes.我不确定为什么其他答案会像他们那样修剪,因为它们正在修剪字节。
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