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ch8/1/ch8_1.go

@@ -0,0 +1,27 @@
+package main
+
+import "fmt"
+
+type Number interface {
+	~int | ~int8 | ~int16 | ~int32 | ~int64 | ~uint | ~uint8 | ~uint16 |
+		~uint32 | ~uint64 | ~float32 | ~float64
+}
+
+func NumDoubler[T Number](val T) T {
+	return val * 2
+}
+
+func main() {
+	val := 10.3
+	fmt.Println(val)
+	val = NumDoubler(val)
+	fmt.Println(val)
+	val = NumDoubler(val)
+	fmt.Println(val)
+	val = NumDoubler(val)
+	fmt.Println(val)
+	val = NumDoubler(val)
+	fmt.Println(val)
+	val = NumDoubler(val)
+	fmt.Println(val)
+}

ch8/1/go.mod

@@ -0,0 +1,3 @@
+module ch8_1
+
+go 1.25.0