add converge implementation

converge.go

@@ -0,0 +1,15 @@
+package fp
+
+/*
+ * Converge is a function that Accepts a converging function and variadic parameters of function  and returns a new function.
+ * When invoked, this new function is applied to some arguments,
+ * and each branching function is applied to those same arguments.
+ * The results of each branching function are passed as arguments to the converging function to produce the return value.
+ */
+
+// Apply converge of 2 branch functions
+func Converge2[R1, R2, R, T any](fc func(R1, R2) R, f1 func(T) R1, f2 func(T) R2) func(T) R {
+	return func(t T) R {
+		return fc(f1(t), f2(t))
+	}
+}

converge_test.go

@@ -0,0 +1,18 @@
+package fp
+
+import (
+	"fmt"
+	"testing"
+)
+
+func TestConverge_Example(t *testing.T) {
+	concatNumbers := func(n1, n2 int) string {
+		return fmt.Sprintf("%d%d", n1, n2)
+	}
+	res := Converge2(concatNumbers, add1, double)(10)
+	expected := "1120"
+
+	if res != expected {
+		t.Errorf("Should converge results of two functions. Expected: %s, Received:%s", expected, res)
+	}
+}