Write to and read from file

cards/deck.go

@@ -1,6 +1,10 @@
 package main
 
-import "fmt"
+import (
+	"fmt"
+	"io/ioutil"
+	"strings"
+)
 
 type deck []string
 
@@ -21,3 +25,24 @@ func newDeck() deck {
 	}
 	return cards
 }
+
+func deal(d deck, handsize int) (deck, deck) {
+	return d[:handsize], d[handsize:]
+}
+
+func (d deck) toString(seperator string) string {
+	return strings.Join(d, "\n")
+}
+
+func fromString(input []byte, seperator string) deck {
+	return strings.Split(string(input), seperator)
+}
+
+func (d deck) save(filename string) error {
+	return ioutil.WriteFile(filename, []byte(d.toString("\n")), 0644)
+}
+
+func load(filename string) (deck, error) {
+	bytes, err := ioutil.ReadFile(filename)
+	return fromString(bytes, "\n"), err
+}

cards/main.go

@@ -1,6 +1,10 @@
 package main
 
 func main() {
-	cards := newDeck()
-	cards.print()
+	//cards := newDeck()
+	//cards.save("cards")
+	cards, _ := load("cards")
+	hand, remainingCards := deal(cards, 5)
+	hand.print()
+	remainingCards.print()
 }