initial commit

closures/closures.go

@@ -0,0 +1,30 @@
+package main
+
+import "fmt"
+
+// This function returns another function,
+// which we define anonymously in the body of the intSeq.
+// The returned function closes over the variable i to form a closure
+func intSeq() func() int {
+	i := 0
+	return func() int {
+		i++
+		return i
+	}
+}
+
+func main(){
+	//we call intSeq assigning the result(a function) to nextInt.
+	// This function value captures its own i value, which will be updated
+	// each time we call nextInt
+	nextInt := intSeq()
+
+	// see the effect of the closure by calling nextInt a few times.
+	fmt.Println(nextInt())
+	fmt.Println(nextInt())
+	fmt.Println(nextInt())
+
+	// to confirm that the state is unique to the instance create a new instance
+	newInts := intSeq()
+	fmt.Println(newInts())
+}