CODEWITHSUNDEEP
nashorn
Zo72
Zo72

Reputation: 15305

Nashorn: how do I distinguish between a javascript object and a java object?

I am trying to work out how to distinguish between a javascript object and a java object inside a script running on Nashorn.

I ended up writing something like this:

function isJavaObject(oj) {
    return oj.getClass && oj.hashCode 
}

Is there a better way ?

Note that using instanceof against java.lang.Object does not work

oj = {} 
oj instanceof Java.type("java.lang.Object")  // returns true

Upvotes: 1

Views: 477

Answers (1)

Attila Szegedi
Attila Szegedi

Reputation: 4595

Nashorn has a non-ECMA-standard built-in object "Java" (capital "J") that has a lot of goodies, among them the Java.isJavaObject(obj) function that returns true if the specified object is a Java object but not a script object. There is also Java.isScriptObject(obj) that returns almost the exact opposite, except for null for which both functions return false.

Upvotes: 6

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