Fix #33 - https://tour.golang.org/moretypes/23-24

sidik/moretypes_18.go

@@ -1,11 +1,13 @@
 package sidik
 
-// import "golang.org/x/tour/pic"
+import (
+	"golang.org/x/tour/pic"
+)
 
-// func Pic(dx, dy int) [][]uint8 {
-// 	return x*y
-// }
+func Pic(dx, dy int) [][]uint8 {
+		return dx, dy
+}
 
-// func type18() {
-// 	pic.Show(Pic)
-// }
+func type18() {
+	pic.Show(Pic)
+}

sidik/moretypes_23.go

@@ -0,0 +1,13 @@
+package sidik
+
+import (
+	"golang.org/x/tour/wc"
+)
+
+func WordCount(s string) map[string]int {
+	return map[string]int{s: 1}
+}
+
+func type23() {
+	wc.Test(WordCount)
+}

sidik/moretypes_24.go

@@ -0,0 +1,21 @@
+package sidik
+
+import (
+	"fmt"
+	"math"
+)
+
+func compute(fn func(float64, float64) float64) float64 {
+	return fn(3, 4)
+}
+
+func type24() {
+	hypot := func (x, y float64) float64 {
+		return math.Sqrt(x*x + y*y)
+	}
+
+	fmt.Println(hypot(5, 12))
+
+	fmt.Println(compute(hypot))
+	fmt.Println(compute(math.Pow))
+}

sidik/sidik.go

@@ -60,6 +60,8 @@ func Main() {
 	type20()
 	type21()
 	type22()
+	// type23()
+	type24()
 }
 
 func basic1() {