blog-on-node-addon-function-with-params

add_function.diff

diff --git a/cppsrc/Samples/functionexample.cpp b/cppsrc/Samples/functionexample.cpp
index 0bd9bc2..37b7eb9 100644
--- a/cppsrc/Samples/functionexample.cpp
+++ b/cppsrc/Samples/functionexample.cpp
@@ -4,13 +4,33 @@ std::string functionexample::hello(){
     return "Hello World";
 }
 
+int functionexample::add(int a, int b){
+  return a + b;
+}
+
 Napi::String functionexample::HelloWrapped(const Napi::CallbackInfo& info) {
     Napi::Env env = info.Env();
     Napi::String returnValue = Napi::String::New(env, functionexample::hello());
     return returnValue;
 }
 
+
+Napi::Number functionexample::AddWrapped(const Napi::CallbackInfo& info) {
+    Napi::Env env = info.Env();
+    if (info.Length() < 2 || !info[0].IsNumber() || !info[1].IsNumber()) {
+        Napi::TypeError::New(env, "Number expected").ThrowAsJavaScriptException();
+    } 
+
+    Napi::Number first = info[0].As<Napi::Number>();
+    Napi::Number second = info[1].As<Napi::Number>();
+
+    int returnValue = functionexample::add(first.Int32Value(), second.Int32Value());
+    
+    return Napi::Number::New(env, returnValue);
+}
+
 Napi::Object functionexample::Init(Napi::Env env, Napi::Object exports) {
     exports.Set("hello", Napi::Function::New(env, functionexample::HelloWrapped));
+    exports.Set("add", Napi::Function::New(env, functionexample::AddWrapped));
     return exports;
 }
 
 
diff --git a/cppsrc/Samples/functionexample.h b/cppsrc/Samples/functionexample.h
index 44563aa..e15aa7b 100644
--- a/cppsrc/Samples/functionexample.h
+++ b/cppsrc/Samples/functionexample.h
@@ -4,6 +4,10 @@ namespace functionexample {
 
     std::string hello();
     Napi::String HelloWrapped(const Napi::CallbackInfo& info);
-    Napi::Object Init(Napi::Env env, Napi::Object exports);
 
+    int add(int a, int b);
+    Napi::Number AddWrapped(const Napi::CallbackInfo& info);
+
+    Napi::Object Init(Napi::Env env, Napi::Object exports);
+    
 }
 
 
diff --git a/index.js b/index.js
index e91b98f..72860f8 100644
--- a/index.js
+++ b/index.js
@@ -1,4 +1,5 @@
 const testAddon = require('./build/Release/testaddon.node');
 console.log('addon',testAddon);
-console.log(testAddon.hello());
+console.log('hello ', testAddon.hello());
+console.log('add ', testAddon.add(5, 10));
 module.exports = testAddon;