Исходники и презентации

lessons/functions/conveyor/main.go

@@ -0,0 +1,42 @@
+package main
+
+import "fmt"
+
+func sqr(number int) int {
+	return number * number
+}
+
+func neg(number int) int {
+	return -number
+}
+
+func inc(number int) int {
+	return number + 1
+}
+
+func pipe(value int, fn ...func(int) int) int {
+	for _, v := range fn {
+		value = v(value)
+	}
+
+	return value
+}
+
+func reverse(fn ...func(int) int) []func(int) int {
+	for idx := 0; idx < len(fn)/2; idx++ {
+		fn[idx], fn[len(fn)-idx-1] = fn[len(fn)-idx-1], fn[idx]
+	}
+
+	return fn
+}
+
+func main() {
+	// decorator way
+	decorationResult := inc(neg(sqr(5)))
+	fmt.Println(decorationResult)
+
+	// composition way
+	compositionResult1 := pipe(5, sqr, neg, inc)
+	compositionResult2 := pipe(5, reverse(inc, neg, sqr)...)
+	fmt.Println(compositionResult1, compositionResult2)
+}