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string.go
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/
string.go
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package utils
import (
"bytes"
"strconv"
"strings"
"unsafe"
)
// IsEmpty 是否是空字符串
func IsEmpty(s string) bool {
if s == "" {
return true
}
return strings.TrimSpace(s) == ""
}
// ConcatString 连接字符串
// NOTE: 性能比fmt.Sprintf和+号要好
func ConcatString(s ...string) string {
if len(s) == 0 {
return ""
}
var buffer bytes.Buffer
for _, i := range s {
buffer.WriteString(i)
}
return buffer.String()
}
// StringToUint64 字符串转uint64
func StringToUint64(str string) (uint64, error) {
if str == "" {
return 0, nil
}
valInt, err := strconv.Atoi(str)
if err != nil {
return 0, err
}
return uint64(valInt), nil
}
// StringToInt64 字符串转int64
func StringToInt64(str string) (int64, error) {
if str == "" {
return 0, nil
}
valInt, err := strconv.Atoi(str)
if err != nil {
return 0, err
}
return int64(valInt), nil
}
// StringToInt 字符串转int
func StringToInt(str string) (int, error) {
if str == "" {
return 0, nil
}
valInt, err := strconv.Atoi(str)
if err != nil {
return 0, err
}
return valInt, nil
}
// --------- 字节切片和字符串转换 ----------
// 性能很高, 原因在于底层无新的内存申请与拷贝
// BytesToString 字节切片转字符串
func BytesToString(b []byte) string {
return *(*string)(unsafe.Pointer(&b))
}
// StringToBytes convert string to byte
func StringToBytes(s string) []byte {
x := (*[2]uintptr)(unsafe.Pointer(&s))
h := [3]uintptr{x[0], x[1], x[1]}
return *(*[]byte)(unsafe.Pointer(&h))
}