string.go

package goTools

import (
	"reflect"
	"unsafe"
)

// StringToBytes converts string to byte slice without a memory allocation.
func StringToBytes(s string) (b []byte) {
	sh := (*reflect.StringHeader)(unsafe.Pointer(&s))
	bh := (*reflect.SliceHeader)(unsafe.Pointer(&b))
	bh.Data, bh.Len, bh.Cap = sh.Data, sh.Len, sh.Len
	return b
}

// BytesToString converts byte slice to string without a memory allocation.
func BytesToString(b []byte) string {
	return *(*string)(unsafe.Pointer(&b))
}

// go1.20
func StringToBytes(s string) []byte {
    return unsafe.Slice(unsafe.StringData(s), len(s))
}

// go1.20
func BytesToString(b []byte) string {
    return unsafe.String(&b[0], len(b))
}

func reverseString(s string) string {
	r := []rune(s)
	for i, j := 0, len(r)-1; i < j; i, j = i+1, j-1 {
		r[i], r[j] = r[j], r[i]
	}
	return string(r)
}

func reverseStringByByte(s string) string {
	r := []byte(s)
	for i, j := 0, len(r)-1; i < j; i, j = i+1, j-1 {
		r[i], r[j] = r[j], r[i]
	}
	return string(r)
}

func reverseStringByEmptyStr(s string) string {
	result := ""
	for _, v := range s {
		result = string(v) + result
	}
	return result
}