golang substring方法的几种实现，golangsubstring

golang substring方法的几种实现，golangsubstring

substring方法的几种实现

s:="abcde"
fmt.Println(s[0:2]);

//输出
//ab

//包含中文的字符串
s2 := "我是中国人"
fmt.Println(s2[0:2])

//输出
//  ��
//有乱码呀

//获取source的子串,如果start小于0或者end大于source长度则返回""
//start:开始index，从0开始，包括0
//end:结束index，以end结束，但不包括end
func substring(source string, start int, end int) string {
    var r = []rune(source)
    length := len(r)

    if start < 0 || end > length || start > end {
        return ""
    }

    if start == 0 && end == length {
        return source
    }

    return string(r[start : end])
}

“`golang
//获取source的子串,如果start小于0或者end大于source长度则返回””
//start:开始index，从0开始，包括0
//end:结束index，以end结束，但不包括end
func substring(source string, start int, end int) string {
var r = []rune(source)
length := len(r)

if start < 0 || end > length || start > end {
    return ""
}

if start == 0 && end == length {
    return source
}

if start == end {
    return string(r[start])
}

var substring = ""
for i := 0; i < length; i++ {
    if i < start {
        continue
    }
    if i >= end {
        break
    }
    substring += string(r[i])
}

return substring

}

//方法二：

func substring(source string, start int, end int) string {

var substring = ""
var pos = 0
for _, c := range source {
    if pos < start {
        pos++
        continue
    }
    if pos >= end {
        break
    }
    pos++
    substring += string(c)
}

return substring

}
//方法三

func substring(source string, start int, end int) string {
var r = []rune(source)
length := len(r)

if start < 0 || end > length || start > end {
    return ""
}

if start == 0 && end == length {
    return source
}

var substring = ""
for i := start; i < length; i++ {
    substring += string(r[i])
}

return substring

}

s := “1人民币哈哈只”
fmt.Printf(“%s\n”, substring(s, 1, 7))

//输出
//人民币哈哈只
“`**