Set prototype for all object properties

Let's say I have the object:

var Animals = { cow: { id: 1, value: "moo" }, chicken: { id: 2, value: "cluck" } };

What I'd like to do override the toString method on all the properties (cow, chicken, etc.). I know I can do it individually, but is there something to cover all properties in one call? Something like:

Animals.properties.prototype.toString = function() { return this.value; }


The only thing you can do is iterate over the object's properties:

for (var prop in Animals) { Animals[prop].toString = ...; }


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