Omit keys from an object

deepOmit.js

/**
 * Omit keys from an object by an Array
 * 
 * @param Object Obj The original object
 * @param [[string, ....] The array of blacklisted keys
 * 
 * @returns a clone of the obj with the keys removed
 */ 
var deepOmit = function (obj) {
    var keys = Array.prototype.concat.apply(Array.prototype, Array.prototype.slice.call(arguments, 1));
    var recurse = function (keyChain, obj) {
        var copy = {};
        keyChain = keyChain || [];
        for (var key in obj) {
            if (keys.indexOf(keyChain.concat(key).join('.')) == -1) {
                copy[key] = obj[key];

                if (typeof obj[key] === 'object') {
                    copy[key] = recurse(keyChain.concat(key), obj[key]);
                }
            }
        }
        return copy;
    };
    return recurse([], obj);
};

/*
console.log(deepOmit({
    a: 'b',
    c: {
        d: 'e'
    }
}, ['c.d']));
*/