Go 言語で スライスを合体させてトランプの組み合わせを作る ( #go join multiple string slice n times ) - Qiita

// https://golang.org/pkg/math/rand/ package main import ( "fmt" ) func main() { cards := []string{"2", "3", "4", "5", "6", "7", "8", "9", "10", "J", "Q", "K", "A"} cards4 := []string{} for i := 0; i < 4; i++ { cards4 = append(cards4, cards...) } fmt.Println(len(cards4)) // 52 fmt.Println(cards4) // [2 3 4 5 6 7 8 9 10 J Q K A 2 3 4 5 6 7 8 9 10 J Q K A 2 3 4 5 6 7 8 9 10 J Q K A 2 3 4 5 6 7 8 9 1