strings

Package strings implements simple functions to manipulate UTF-8 encoded strings. For information about UTF-8 strings in Go, see https://blog.golang.org/strings.

简单的utf-8编码的字符串操作库,详见:https://blog.golang.org/strings.

func clone

func Clone(s string) string
Clone 返回一个_s_的拷贝, 当截取一个长字符串中的一部分时,确保s的拷贝是在新分配的内存中, 使用该方法可以帮助程序使用更少的内存, 由于使用clone会返回一个值拷贝, 过度使用Clone会让程序占用更多内存, 正常情况下应该尽量减少Clone的使用; 对于长度为0的字符串, 将返回_''_,并且不分配内存空间.

package main
import (
    "fmt"
    "strings"
)
func main() {
    var s string = "vito love golang"
    sCloned := strings.Clone(s)
    fmt.Println("s:\t\t", s, "&s\t\t", &s)
    fmt.Println("sCloned:\t", sCloned, "&sCloned\t", &sCloned)
}
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Output:
s:      vito love golang     &s:      0xc000050250
sCloned:vito love golang     &sCloned:0xc000050260

func Compare

func Compare(a, b string) int
比较两个字符串大小, 返回一个整数. 如果_a==b_返回_0_,若_a<b_返回_-1_,_a>b_返回_1_,
Compare只是用来和 bytes包对称, 比较字符串通常使用_==,>,<_会更直观,更快.

package main
import (
    "fmt"
    "strings"
)
func main() {
    var Words string = "go language"                 //2 bytes
    var Letters string = "go"                       //1 bytes
    var Chineses string = "你好"                     //6 bytes
    fmt.Println(strings.Compare(Words, Letters))    //Words > Letters
    fmt.Println(strings.Compare(Words, Chineses))    //Words < Chineses
    fmt.Println(strings.Compare(Chineses, Letters))    //Chineses > Letters
       fmt.Println(strings.Compare(Letters, Letters))    
}
---------------------------------------------------------------------------------
Output:
1
-1
1
0

fun Contains

func Contains(s, substr string) bool
判断字符串s 是否包含字符串substr

package main
import (
    "fmt"
    "strings"
)
func main() {
    substr := "go"
    s := "golang"
    substr2 := "java"
    fmt.Println(strings.Contains(s, substr))
    fmt.Println(strings.Contains(s, substr2))
}
---------------------------------------------------------------------------------
Output:
true
false