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//+build !go1.10
// Package shuffle provides primitives for shuffling slices and user-defined
// collections.
package shuffle
import (
"math/rand"
"sort"
)
// Shuffle shuffles Data.
func Shuffle(data Interface) {
n := data.Len()
for i := n - 1; i >= 0; i-- {
j := rand.Intn(i + 1)
data.Swap(i, j)
}
}
// A Shuffler provides Shuffle
type Shuffler rand.Rand
// New returns a new Shuffler that uses random values from src
// to shuffle
func New(src rand.Source) *Shuffler { return (*Shuffler)(rand.New(src)) }
// Shuffle shuffles Data.
func (s *Shuffler) Shuffle(data Interface) {
n := data.Len()
for i := n - 1; i >= 0; i-- {
j := (*rand.Rand)(s).Intn(i + 1)
data.Swap(i, j)
}
}
// Ints shuffles a slice of ints.
func (s *Shuffler) Ints(a []int) { s.Shuffle(sort.IntSlice(a)) }
// Float64s shuffles a slice of float64s.
func (s *Shuffler) Float64s(a []float64) { s.Shuffle(sort.Float64Slice(a)) }
// Strings shuffles a slice of strings.
func (s *Shuffler) Strings(a []string) { s.Shuffle(sort.StringSlice(a)) }
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