3 A _local handle_ is a pointer to an object. All V8 objects are accessed using handles, they are necessary because of the way the V8 garbage collector works.
5 A handle scope can be thought of as a container for any number of handles. When you've finished with your handles, instead of deleting each one individually you can simply delete their scope.
7 The creation of `HandleScope` objects is different across the supported versions of V8. Therefore, NAN provides its own implementations that can be used safely across these.
9 - <a href="#api_nan_handle_scope"><b><code>Nan::HandleScope</code></b></a>
10 - <a href="#api_nan_escapable_handle_scope"><b><code>Nan::EscapableHandleScope</code></b></a>
12 Also see the V8 Embedders Guide section on [Handles and Garbage Collection](https://github.com/v8/v8/wiki/Embedder%27s%20Guide#handles-and-garbage-collection).
14 <a name="api_nan_handle_scope"></a>
17 A simple wrapper around [`v8::HandleScope`](https://v8docs.nodesource.com/io.js-3.0/d3/d95/classv8_1_1_handle_scope.html).
22 class Nan::HandleScope {
25 static int NumberOfHandles();
29 Allocate a new `Nan::HandleScope` whenever you are creating new V8 JavaScript objects. Note that an implicit `HandleScope` is created for you on JavaScript-accessible methods so you do not need to insert one yourself.
34 // new object is created, it needs a new scope:
36 Nan::HandleScope scope;
37 v8::Local<v8::Object> obj = Nan::New<v8::Object>();
40 // JavaScript-accessible method already has a HandleScope
41 NAN_METHOD(Pointless2) {
42 v8::Local<v8::Object> obj = Nan::New<v8::Object>();
46 <a name="api_nan_escapable_handle_scope"></a>
47 ### Nan::EscapableHandleScope
49 Similar to [`Nan::HandleScope`](#api_nan_handle_scope) but should be used in cases where a function needs to return a V8 JavaScript type that has been created within it.
54 class Nan::EscapableHandleScope {
56 Nan::EscapableHandleScope();
57 static int NumberOfHandles();
58 template<typename T> v8::Local<T> Escape(v8::Local<T> value);
62 Use `Escape(value)` to return the object.
67 v8::Local<v8::Object> EmptyObj() {
68 Nan::EscapableHandleScope scope;
69 v8::Local<v8::Object> obj = Nan::New<v8::Object>();
70 return scope.Escape(obj);