Universal field getter for JavaScript objects.

get-field.js

/**
 * Universal field getter method for JavaScript objects.
 * @param  {Object} _path    The field path inside `this`.
 * @param  {...}    _default The default value to be returns if field is not found.
 * @return {...}             Returns the found field value else `_default` else `undefined`.
 */
Object.prototype._ = Object.prototype._ || function(_path, _default) {
    var value = _path.split('.').reduce(
            function(hash, field) {
                return hash && hash[field]
            },
            this
        );
    return typeof(value) === 'undefined' ? _default : value;
}

Long comment:
https://gist.github.com/CristianTincu/a4e137bb5cae3f11fadd

FWIW: Posting comments on your personal blog returns 403. ☺