You could roll your own:

function resolve(objectToGetValueFrom, stringOfDotSeparatedParameters) {
    var returnObject = objectToGetValueFrom,
        parameters = stringOfDotSeparatedParameters.split('.'),
        i,
        parameter;

    for (i = 0; i < parameters.length; i++) {
        parameter = parameters[i];

        returnObject = returnObject[parameter];

        if (returnObject === undefined) {
            break;
        }
    }
    return returnObject;
};

And the use it like this:

var result = resolve(obj, 'a.b.c.d'); 

* result is undefined any one of a, b, c or d is undefined

You could roll your own:

function resolve(objectToGetValueFrom, stringOfDotSeparatedParameters) {
    var returnObject = objectToGetValueFrom,
        parameters = stringOfDotSeparatedParameters.split('.'),
        i,
        parameter;

    for (i = 0; i < parameters.length; i++) {
        parameter = parameters[i];

        returnObject = returnObject[parameter];

        if (returnObject === undefined) {
            break;
        }
    }
    return returnObject;
};

And use it like this:

var result = resolve(obj, 'a.b.c.d'); 

* result is undefined if any one of a, b, c or d is undefined.

You could roll your own:

function resolve(objectToGetValueFrom, stringOfDotSeparatedParameters) {
    var returnObject = objectToGetValueFrom,
        parameters = stringOfDotSeparatedParameters.split('.'),
        i,
        parameter;

    for (i = 0; i < parameters.length; i++) {
        parameter = parameters[i];

        returnObject = returnObject[parameter];

        if (returnObject === undefined) {
            return undefined;
        }
    }
    return returnObject;
};

And the use it like this:

var result = resolve(obj, 'a.b.c.d'); 

* result is undefined any one of a, b, c or d is undefined

You could roll your own:

function resolve(objectToGetValueFrom, stringOfDotSeparatedParameters) {
    var returnObject = objectToGetValueFrom,
        parameters = stringOfDotSeparatedParameters.split('.'),
        i,
        parameter;

    for (i = 0; i < parameters.length; i++) {
        parameter = parameters[i];

        returnObject = returnObject[parameter];

        if (returnObject === undefined) {
            break;
        }
    }
    return returnObject;
};

And the use it like this:

var result = resolve(obj, 'a.b.c.d'); 

* result is undefined any one of a, b, c or d is undefined