void MyFunction(const FunctionCallbackInfoIn this example, the FunctionCallbackInfo holder is used to check that the function was called with two arguments, and that the first argument is a string and the second argument is a number. The string argument is then converted to a C++ string using the `String::Utf8Value` class, and the number argument is retrieved using the `NumberValue` method. The V8 engine is a standalone package library for C++, developed by Google, that provides an interface for running JavaScript code in C++ applications.& args) { Isolate* isolate = args.GetIsolate(); if (args.Length() < 2) { isolate->ThrowException(Exception::TypeError( String::NewFromUtf8(isolate, "Wrong number of arguments"))); return; } if (!args[0]->IsString() || !args[1]->IsNumber()) { isolate->ThrowException(Exception::TypeError( String::NewFromUtf8(isolate, "Wrong arguments types"))); return; } String::Utf8Value str(args[0]); double num = args[1]->NumberValue(); // do something with str and num... }