learning closure | IMPORTANT (revisit)

closures/go.mod

@@ -0,0 +1,3 @@
+module main
+
+go 1.27.0

closures/main.go

@@ -0,0 +1,20 @@
+package main
+
+import (
+	"fmt"
+)
+
+func fib() func() int {
+	a, b := 0, 1
+	return func() int {
+		a, b = b, a+b
+		return b
+	}
+}
+
+func main() {
+	f := fib()
+	for x := f(); x < 100; x = f() {
+		fmt.Println(x)
+	}
+}