Is there a better way to test for a custom Object in an array of custom Objects?

custom-objects-in-arrays.js

// `id` is a custom Object and `Actor.getTips()` is an array of `id`s
Actor.prototype.hasTipped = function(id) {
	return new RegExp(id.toString())
		.test(this.getTips().toString());
}

/*
 * Specifically, these are MongoDB ObjectIDs from the node-mongodb-native repository. 
 * Actor.getTips().indexOf(id) does not work because `===` returns false on, say,
 * Actor.getTips()[0] === id.
 */