randutil

Documentation

Index

• Variables
• func BigIntN(n *big.Int) *big.Int
• func Bits(b []byte)
• func Bytes(n int) []byte
• func Int(min int, max int) int
• func IntN(n int) int
• func Ints(from, to, size int) []int
• func Perm(n int) []int
• func Probability(prob float64) bool
• func Random(ss []string) []string
• func Read(b []byte)
• func Shuffle(n int, swap func(i, j int))
• func String(n int) string
• func UUID(length int64) string
• func Uint64n(n uint64) uint64

Variables

var Reader *randReader

Reader is a global, shared instance of a cryptographically strong pseudo- random generator. It uses blake2b as its hashing function. Reader is safe for concurrent use by multiple goroutines.

Functions

func BigIntN

func BigIntN(n *big.Int) *big.Int

BigIntN returns a uniform random *big.Int in [0,n). It panics if n <= 0.

func Bits

func Bits(b []byte)

func Bytes

func Bytes(n int) []byte

Bytes a helper function that returns n bytes of random data.

func Int

func Int(min int, max int) int

Int returns a random integer in range [min, max].

func IntN

func IntN(n int) int

IntN returns a uniform random int in [0,n). It panics if n <= 0.

func Ints

func Ints(from, to, size int) []int

Ints returns a random integer array with the specified from, to and size.

func Perm

func Perm(n int) []int

Perm returns a random permutation of the integers [0,n).

func Probability

func Probability(prob float64) bool

Probability

func Random

func Random(ss []string) []string

Random return random string from string slice

func Read

func Read(b []byte)

Read is a helper function that calls Reader.Read on b. It always fills b completely.

func Shuffle

func Shuffle(n int, swap func(i, j int))

Shuffle randomizes the order of elements. n is the number of elements. It panics if n < 0. swap swaps the elements with indexes i and j.

func String

func String(n int) string

func UUID

func UUID(length int64) string

UUID return uuid

func Uint64n

func Uint64n(n uint64) uint64

Uint64n returns a uniform random uint64 in [0,n). It panics if n == 0.