Looking for streamlined way to access object properties

[kent williams]

There's a convention that we use for our C++ native functions called from C++, where required arguments are followed (optionally) by an object whose properties are additional flags. EG

var num = convertNumber(x);

var num2 = convertNumber(x, { base: 8 });

Is there a streamlined way to extract properties from this optional object?

I end up doing this:

v8::Local<v8::Object> argsObj;

argsObj.Clear();

if(args.Length() >=2)

  argsObj = args[1];

const char *cvval = 0;

if(!argsObj.IsEmpty()) {

  v8::Local<v8::String> cvt = v8::String::NewFromUtf8(isolate,

                                           "convert", v8::NewStringType::kNormal).ToLocalChecked();

  v8::MaybeLocal<v8::Value> convertval = argsObj->Get(context,cvt);

  if(!convertval.IsEmpty()) {

    v8::Local<v8::Value> cv = convertval.ToLocalChecked();

    v8::String::Utf8Value val2 = cv->ToString();

    cvval = *val2 ? *val2 : 0;

  }

}

This seems like a whole lot of work -- way more than Spidermonkey, for example.

Are there some convenience functions that make this less painful, or do I have to write my own?

Thanks!

[Jochen Eisinger]

You could use v8::Object::GetOwnPropertyNames instead of trying each key individually

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[kent williams]

I should maybe try v8::Object::Has -- it looks like it will tell you if an object has a property, but it isn't really documented anywhere what it does.

[kent williams]

I answered my own question again, sort of.

Both v8::Object::Has() and v8::Object::HasOwnProperty() will return true if a property exists on an object.