Implement examples for node 4.x.

1_hello_world/node_4.x/binding.gyp

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+{
+  "targets": [
+    {
+      "target_name": "hello",
+      "sources": [ "hello.cc" ]
+    }
+  ]
+}

1_hello_world/node_4.x/hello.cc

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+// hello.cc
+#include <node.h>
+
+namespace demo {
+
+using v8::FunctionCallbackInfo;
+using v8::Isolate;
+using v8::Local;
+using v8::Object;
+using v8::String;
+using v8::Value;
+
+void Method(const v8::FunctionCallbackInfo<Value>& args) {
+  Isolate* isolate = args.GetIsolate();
+  args.GetReturnValue().Set(String::NewFromUtf8(isolate, "world"));
+}
+
+void Init(Local<Object> exports) {
+  NODE_SET_METHOD(exports, "hello", Method);
+}
+
+NODE_MODULE(hello, Init)
+
+} // namespace demo

1_hello_world/node_4.x/hello.js

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+const addon = require('bindings')('hello');
+
+console.log(addon.hello()); // 'world'

1_hello_world/node_4.x/package.json

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+{
+  "name": "hello_world",
+  "version": "0.0.0",
+  "description": "Node.js Addons Example #1",
+  "main": "hello.js",
+  "private": true,
+  "scripts": {
+    "test": "node hello.js"
+  },
+  "gypfile": true,
+  "dependencies": {
+    "bindings": "~1.2.1"
+  }
+}

2_function_arguments/node_4.x/addon.cc

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+// addon.cc
+#include <node.h>
+
+namespace demo {
+
+using v8::Exception;
+using v8::FunctionCallbackInfo;
+using v8::Isolate;
+using v8::Local;
+using v8::Number;
+using v8::Object;
+using v8::String;
+using v8::Value;
+
+// This is the implementation of the "add" method
+// Input arguments are passed using the
+// const FunctionCallbackInfo<Value>& args struct
+void Add(const FunctionCallbackInfo<Value>& args) {
+  Isolate* isolate = args.GetIsolate();
+
+  // Check the number of arguments passed.
+  if (args.Length() < 2) {
+    // Throw an Error that is passed back to JavaScript
+    isolate->ThrowException(Exception::TypeError(
+        String::NewFromUtf8(isolate, "Wrong number of arguments")));
+    return;
+  }
+
+  // Check the argument types
+  if (!args[0]->IsNumber() || !args[1]->IsNumber()) {
+    isolate->ThrowException(Exception::TypeError(
+        String::NewFromUtf8(isolate, "Wrong arguments")));
+    return;
+  }
+
+  // Perform the operation
+  double value = args[0]->NumberValue() + args[1]->NumberValue();
+  Local<Number> num = Number::New(isolate, value);
+
+  // Set the return value (using the passed in
+  // FunctionCallbackInfo<Value>&)
+  args.GetReturnValue().Set(num);
+}
+
+void Init(Local<Object> exports) {
+  NODE_SET_METHOD(exports, "add", Add);
+}
+
+NODE_MODULE(addon, Init)
+
+} // namespace demo

2_function_arguments/node_4.x/addon.js

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+const addon = require('bindings')('addon.node');
+
+console.log('This should be eight:', addon.add(3, 5));

2_function_arguments/node_4.x/binding.gyp

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+{
+  "targets": [
+    {
+      "target_name": "addon",
+      "sources": [ "addon.cc" ]
+    }
+  ]
+}

2_function_arguments/node_4.x/package.json

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+{
+  "name": "function_arguments",
+  "version": "0.0.0",
+  "description": "Node.js Addons Example #2",
+  "main": "addon.js",
+  "private": true,
+  "dependencies": {
+    "bindings": "~1.2.1",
+    "nan": "~1.3.0"
+  },
+  "scripts": {
+    "test": "node addon.js"
+  },
+  "gypfile": true
+}

3_callbacks/node_4.x/addon.cc

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+// addon.cc
+#include <node.h>
+
+namespace demo {
+
+using v8::Function;
+using v8::FunctionCallbackInfo;
+using v8::Isolate;
+using v8::Local;
+using v8::Null;
+using v8::Object;
+using v8::String;
+using v8::Value;
+
+void RunCallback(const FunctionCallbackInfo<Value>& args) {
+  Isolate* isolate = args.GetIsolate();
+  if (!args[0]->IsFunction()) {
+    return;
+  }
+  Local<Function> cb = Local<Function>::Cast(args[0]);
+  const unsigned argc = 1;
+  Local<Value> argv[argc] = { String::NewFromUtf8(isolate, "hello, world") };
+  cb->Call(Null(isolate), argc, argv);
+}
+
+void Init(Local<Object> exports, Local<Object> module) {
+  NODE_SET_METHOD(module, "exports", RunCallback);
+}
+
+NODE_MODULE(addon, Init)
+
+} // namespace demo

3_callbacks/node_4.x/addon.js

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+const addon = require('bindings')('addon');
+
+addon((msg) => {
+  console.log(msg); // 'hello world'
+});
+addon(); // nothing

3_callbacks/node_4.x/binding.gyp

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+{
+  "targets": [
+    {
+      "target_name": "addon",
+      "sources": [ "addon.cc" ]
+    }
+  ]
+}

3_callbacks/node_4.x/package.json

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+{
+  "name": "callbacks",
+  "version": "0.0.0",
+  "description": "Node.js Addons Example #3",
+  "main": "addon.js",
+  "private": true,
+  "gypfile": true,
+  "dependencies": {
+    "bindings": "~1.2.1"
+  }
+}

4_object_factory/node_4.x/addon.cc

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+// addon.cc
+#include <node.h>
+
+namespace demo {
+
+using v8::Exception;
+using v8::FunctionCallbackInfo;
+using v8::Isolate;
+using v8::Local;
+using v8::Null;
+using v8::Object;
+using v8::String;
+using v8::Value;
+
+void CreateObject(const FunctionCallbackInfo<Value>& args) {
+  Isolate* isolate = args.GetIsolate();
+
+  if (!args[0]->IsString()) {
+    isolate->ThrowException(Exception::TypeError(
+      String::NewFromUtf8(isolate, "Argument must be a string"))
+    );
+    return;
+  }
+
+  Local<Object> obj = Object::New(isolate);
+  obj->Set(String::NewFromUtf8(isolate, "msg"), args[0]->ToString());
+
+  args.GetReturnValue().Set(obj);
+}
+
+void Init(Local<Object> exports, Local<Object> module) {
+  NODE_SET_METHOD(module, "exports", CreateObject);
+}
+
+NODE_MODULE(addon, Init)
+
+} // namespace demo

4_object_factory/node_4.x/addon.js

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+const addon = require('bindings')('addon');
+
+const obj1 = addon('hello');
+const obj2 = addon('world');
+console.log(obj1.msg + ', ' + obj2.msg); // 'hello, world'

4_object_factory/node_4.x/binding.gyp

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+{
+  "targets": [
+    {
+      "target_name": "addon",
+      "sources": [ "addon.cc" ]
+    }
+  ]
+}

4_object_factory/node_4.x/package.json

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+{
+  "name": "object_factory",
+  "version": "0.0.0",
+  "description": "Node.js Addons Example #4",
+  "main": "addon.js",
+  "private": true,
+  "gypfile": true,
+  "dependencies": {
+    "bindings": "~1.2.1"
+  }
+}

5_function_factory/node_4.x/addon.cc

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+#include <node.h>
+
+namespace demo {
+
+using v8::Function;
+using v8::FunctionCallbackInfo;
+using v8::FunctionTemplate;
+using v8::Isolate;
+using v8::Local;
+using v8::Object;
+using v8::String;
+using v8::Value;
+
+void MyFunction(const FunctionCallbackInfo<Value>& args) {
+  Isolate* isolate = args.GetIsolate();
+  args.GetReturnValue().Set(String::NewFromUtf8(isolate, "hello, world"));
+}
+
+void CreateFunction(const FunctionCallbackInfo<Value>& args) {
+  Isolate* isolate = args.GetIsolate();
+
+  Local<FunctionTemplate> tpl = FunctionTemplate::New(isolate, MyFunction);
+  Local<Function> fn = tpl->GetFunction();
+
+  // omit this to make it anonymous
+  fn->SetName(String::NewFromUtf8(isolate, "theFunction"));
+
+  args.GetReturnValue().Set(fn);
+}
+
+void Init(Local<Object> exports, Local<Object> module) {
+  NODE_SET_METHOD(module, "exports", CreateFunction);
+}
+
+NODE_MODULE(addon, Init)
+
+} // namespace demo

5_function_factory/node_4.x/addon.js

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+const addon = require('bindings')('addon');
+
+const fn = addon();
+console.log(fn()); // 'hello, world'

5_function_factory/node_4.x/binding.gyp

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+{
+  "targets": [
+    {
+      "target_name": "addon",
+      "sources": [ "addon.cc" ]
+    }
+  ]
+}

5_function_factory/node_4.x/package.json

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+{
+  "name": "function_factory",
+  "version": "0.0.0",
+  "description": "Node.js Addons Example #5",
+  "main": "addon.js",
+  "private": true,
+  "gypfile": true,
+  "dependencies": {
+    "bindings": "~1.2.1"
+  }
+}

6_object_wrap/node_4.x/addon.cc

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+// addon.cc
+#include <node.h>
+#include "myobject.h"
+
+namespace demo {
+
+using v8::Local;
+
+void InitAll(Local<Object> exports) {
+  MyObject::Init(exports);
+}
+
+NODE_MODULE(addon, InitAll)
+
+} // namespace demo

6_object_wrap/node_4.x/addon.js

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+const addon = require('bindings')('addon');
+
+const obj = new addon.MyObject(10);
+console.log( obj.plusOne() ); // 11
+console.log( obj.plusOne() ); // 12
+console.log( obj.plusOne() ); // 13

6_object_wrap/node_4.x/binding.gyp

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+{
+  "targets": [
+    {
+      "target_name": "addon",
+      "sources": [ "addon.cc", "myobject.cc" ]
+    }
+  ]
+}