"Object doesn't support this action" when "newing" a nested Javascript object instance

Question

I have created a "Namespace" of sorts using nested objects in Javascript and am trying to "new' up an instance of a javascript object.

//
// Create the ABC.DTO "namespace"
if (typeof (ABC) == 'undefined') var ABC= { DTO: {} };
//
// Define the ListType object
ABC.DTO.ListType = function (pId, pName) {

    var id   = pId;
    var name = pName;

    return {
        Id: id,
        Name: name
    }
};
//
// Create an instance of the "listType" object
var type1 = new ABC.DTO.ListType(1, 'Letter Type'); // THROWS ERROR

The error being thrown is "Object doesn't support this action" ... I have reviewed the following posts and, unless I am missing something I feel like the code is conformign correctly. Am I overlooking something?

Define a “nested” object constructor in JavaScript?

Instancing new objects in javascript

I see a different error: Uncaught ReferenceError: GMCR is not defined. — Matt Ball
– Matt Ball, Commented May 20, 2013 at 16:06
Yeah that was a typo. I have fixed in in the OP. Sorry 'bout that. — Gary O. Stenstrom
– Gary O. Stenstrom, Commented May 20, 2013 at 16:33

Paul Sweatte · Accepted Answer · 2017-05-26 01:31:02Z

0

This works in the most simple case:

baz = { foo: {} };
baz.foo.bar = Function;
bop = new baz.foo.bar();

console.log(bop);

And the slightly more complex case:

var baz = { foo: {} };
baz.foo.bar = function(){};
var bop = new baz.foo.bar();

console.log(bop);

But fails in the aforementioned case due to hoisting.

References

answered May 26, 2017 at 1:31

Paul Sweatte

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