What's the difference between "WEAK" and "STRONG".

[18f]

Hi, anybody. I found at here, we have two reference type.
``` c++

enum class V8_EXPORT_ENUM HeapObjectReferenceType {

WEAK,

STRONG,

};

```

So I want to know:
1. What's the difference between "WEAK" and "STRONG".
2. Which condition we should use WEAK instead of STRONG?

THX.

[Jakob Kummerow]

It's a common GC term: strong references keep their target alive, weak references don't. More details at https://en.wikipedia.org/wiki/Weak_reference.