initial commit

recursion/recursion.go

@@ -0,0 +1,30 @@
+package main
+
+import "fmt"
+
+//this calls itself until it reaches the base case of fact(0)
+func fact(n int) int {
+	if n == 0 {
+		return 1
+	}
+	return n * fact(n-1)
+}
+
+func main() {
+	fmt.Println(fact(7))
+
+	// closures can also be recursive,
+	// but this requires the closure to be declared with
+	// a typed var explicitly before its defined
+	var fib func(n int) int
+
+	fib = func(n int) int {
+		if n < 2 {
+			return n
+		}
+		return fib(n-1) + fib(n-2)
+	}
+
+	//simce fib was previously declared in main Go knows which function to call with fib here
+	fmt.Println(fib(7))
+}