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Here's how to create a proper "constructor" in Javascript. Note that the confusing "new" operator is not required. Also "private variables" are implemented through the magic of closures.

function gizmo(id) {
return {
id: id,
toString: function () {
return "gizmo " + this.id;
}
};
}
From the slides for Douglas Crockford's Advanced Javascript video.

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