util

func FirstLetter ¶

func FirstLetter(s string) (string, error)

FirstLetter returns the uppercase first letter of a rune no changes should be made if there is no suitable code

func Iconv ¶

func Iconv(s string, former transform.Transformer) ([]byte, error)

Iconv transform rune by former

e.g: `simplifiedchinese.GBK.NewEncoder()` and `simplifiedchinese.GBK.NewDecoder()`

func Int ¶

func Int(rand io.Reader, min, max *big.Int) (n *big.Int, err error)

Int returns a uniform random value in [min, max). It panics if max <= min. Ref crypto/rand

func IsFile ¶

func IsFile(path string) bool

IsFile returns true if given path exists as a file (i.e. not a directory).

func MtRand ¶

func MtRand(min, max int64) (int64, error)

MtRand crypto rand a number

func Ord ¶

func Ord(s string) int

Ord convert the first byte of a string to a value between 0 and 255

func OrdByte ¶

func OrdByte(b byte) int

OrdByte convert byte to a value between 0 and 255

func OrdRune ¶

func OrdRune(r rune) int

OrdRune convert rune to a value between 0 and 255