Takes an array (or uses all but the first parameter as an array) of strings, removes those properties from the given object and returns an object of all of the removed values.

popProps.js

function popProps(obj, keys) {
    var ret = {};
    keys = ret.toString.call(keys) == '[object Array]'
        ? keys
        : [].slice.call(arguments, 1);
    for (var key, i = keys.length; i--;) {
        key = keys[i];
        ret[key] = obj[key];
        delete obj[key];
    }
    return ret;
}