go：strings与strconv包
一、strings包
1.strings.HasPrefix()
strings.HasPrefix(s string, “prefix” string) bool 判断字符串s是否是以‘prefix’开头，返回值为bool类型
2.strings.HasSuffix()
strings.HasSuffix(s string,”prefix” string) bool 判断字符串s是否是以‘prefix’结尾,返回值为bool类型
3.strings.Index()
strings.Index(s string ‘prefix’ string) int 判断prefix在s中的位置，返回值int,没有返回-1
4.strings.LastIndex()
strings.LastIndex(s string,’prefix’ string) int 判断prefix最后在s中出现的位置，返回值int,没有返回-1
5.strings.Replace()
strings.Replace(str string,old string,new string, n int) 字符串替换
6.strings.Count()
strings.Count(str string,sub strings) int 字符串计数
7.strings.Repeat()
strings.Repeat(str string,count int) string 重复count次str
8.strings.ToLower()
strings.ToLower(str string) string 字符串小写
9.strings.ToUpper()
strings.ToUpper(str string) string 字符串大写
10.strings.TrimSpace()
-strings.TrimSpace(str string) 去掉str首尾空格
-strings.Trim(str string,cut string) 去掉字符串首尾cut字符
- strings.TrimLeft(str string,cut string) 去掉字符串首cut字符
-strings.TrimRight(str string,cut string) 去掉字符串尾cut字符
s := " hello world hello " ret1 := strings.TrimSpace(s) //hello world hello ret2 := strings.Trim(s, " hello ") //world ret3 := strings.TrimLeft(s, " hello ") //world hello ret4 := strings.TrimRight(s, " hello ") // hello world fmt.Println(ret1, ret2, ret3, ret4)
11.strings.Fields
-strings.Fields(str string)返回str空格分隔的所有子串的slice
-strings.Split(str string,split string) 返回str 字符串split分隔的所有子串的slice
-strings.Join(s1 [] strings. sep strings) s1中元素用sep连接起来
func main() {
s := " hello world "
str := strings.Fields(s)
fmt.Println(str) //[hello world]
ret := strings.Split(s, "l")
fmt.Println(ret) //[ he o wor d ]
str2 := strings.Join(ret, "l")
fmt.Println(str2) // hello world
}
二、strconv包
1.strconv.Itoa()
strconv.Itoa(i int) string将一个整数转化为字符串
2.strconv.Atoi()
strconv.Atoi(str string) int,error 将整数转为字符串
str := strconv.Itoa(1000)
fmt.Println(str) // "1000"
str2, error := strconv.Atoi("1000")
if error == nil {
fmt.Println(str2) // 1000
}