A helper function (or underscore mixin) for omitting object properties in multiple levels

omitAttributes.js

var deepCopy = function (value) {
	return JSON.parse(JSON.stringify(value));
};

var omitAttributes = function (obj) {
	var copy = deepCopy(obj);
	var keys = Array.prototype.slice.call(arguments, 1);

	function omitIfFound(obj, parts) {
		if (parts.length > 0 && obj[parts[0]]) {
			if (parts.length == 1) {
				delete obj[parts[0]];
			} else if (parts.length > 1) {
				omitIfFound(obj[parts[0]], _.rest(parts));
			}
		}
	}

	_.each(keys, function (key) {
		var parts = key.split('.');
		omitIfFound(copy, parts);
	});

	return copy;
}

_.mixin({ omitAttributes: omitAttributes });

usage-example.js

var obj = {
  one: "lorem",
  two: "ipsum",
  three: {
    one: "lorem",
    two: "ipsum"
  }
};

console.log( _(obj).omitAttributes('one', 'three.two') );

// Logs:
// { two: "ipsum", three: { one: "lorem" } }