feat: package ro - memoize (#30)

Co-authored-by: Siddarth MSV <siddarthmsv@gmail.com>
Co-authored-by: Aris Tzoumas <atzoumas@rudderstack.com>

ro/ro.go

@@ -0,0 +1,15 @@
+package ro
+
+// Memoize stores the execution result of the provided function in-memory during the first call and uses it as a return value for subsequent calls
+func Memoize[R any](f func() R) func() R {
+	var result R
+	var called bool
+	return func() R {
+		if called {
+			return result
+		}
+		result = f()
+		called = true
+		return result
+	}
+}

ro/ro_test.go

@@ -0,0 +1,23 @@
+package ro
+
+import (
+	"testing"
+)
+
+func TestMemoize(t *testing.T) {
+	var count int
+	f := func() int {
+		count++
+		return count
+	}
+	g := Memoize(f)
+	if g() != 1 {
+		t.Fail()
+	}
+	if g() != 1 {
+		t.Fail()
+	}
+	if g() != 1 {
+		t.Fail()
+	}
+}