Calling JavaScript from C++ with node.js

Question

Is there a way to call JS functions from C++ through node.js (as callbacks or something like that)? If yes, how? I\'m searching for it on the web, but haven\'t found any hel

Answer 1

Of course you can. For example, if you want to write a simple factorial function in C++, you could do something like

#include 

using namespace v8;

int factorial(int n) {
    if (n == 0) return 1;
    else return n * factorial(n - 1);
}

void Factorial(const FunctionCallbackInfo& args) {
    Isolate* isolate = Isolate::GetCurrent();
    HandleScope scope(isolate);

    if (args.Length() != 2) {
        isolate->ThrowException(Exception::TypeError(String::NewFromUtf8(isolate, "Wrong number of arguments")));
    } else {
        if (!(args[0]->IsNumber() && args[1]->IsFunction())) {
            isolate->ThrowException(Exception::TypeError(String::NewFromUtf8(isolate, "Wrong arguments type")));
        } else {
            int result = factorial(args[0]->Int32Value());

            Local callbackFunction = Local::Cast(args[1]);
            const unsigned argc = 1;
            Local argv[argc] = { Number::New(isolate, result) };

            callbackFunction->Call(isolate->GetCurrentContext()->Global(), argc, argv);
        }
    }
}

void Init(Handle