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__proto__ is deprecated. Please avoid using __proto__. Use Object.getPrototypeOf and Object.setPrototypeOf instead.

Object.setPrototypeOf(obj, newProto)

ECMAScript specifies Object.getPrototypeOf(obj) http://es5.github.io/#x15.2.3.2 function to get prototype of the given object. This Object.setPrototypeOf is a nashorn specific extension that allows prototype of an object to be set as newProto. Object.setPrototypeOf is one of proposed extensions in ECMAScript 6.

See also https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/setPrototypeOf

__noSuchProperty__

Any object can have this "property missing" hook method. When a property accessed is not found on the object, this __noSuchProperty__ hook will be called.

var oobj = {   
  __noSuchProperty__: function(n) {      
    print("No such property: " + n);   
  }
}o

obj.foo;     // prints No such property: fooofoo

obj["bar"];  // prints No such property: bar

Object.setPrototypeOf(obj, newProto)

ECMAScript specifies Object.getPrototypeOf(obj) http://es5.github.io/#x15.2.3.2 function to get prototype of the given object. This Object.setPrototypeOf is a nashorn specific extension that allows prototype of an object to be set as newProto. Object.setPrototypeOf is one of proposed extensions in ECMAScript 6.

__noSuchMethod__

Any object can have this "method missing" hook method. When a method is called is not found on the object, this __noSuchMethod__ hook will be called.

 See also https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/setPrototypeOf

Typed Arrays

Nashorn implements typed arrays as specified at https://www.khronos.org/registry/typedarray/specs/latest/ For a tutorial presentation, please check out https://developer.mozilla.org/en-US/docs/Web/JavaScript/Typed_arrays (which includes non-standard StringView which is not implemented by nashorn). Among the typed array constructors, DataView ( https://www.khronos.org/registry/typedarray/specs/latest/#8 ) is not implemented in jdk8's nashorn. DataView is included in jdk8u-dev and so is expected to make it into jdk8u20 release.

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