Recursive/deep extend/assign in Underscore.js?

Question

Is there any way to get Underscore.js extend function:

Copy all of the properties in the source objects over to the destination object, and return t

Answer 1

Stand-alone version of Bergi's deep extend, including the fix for when a value is a string instead of an object. Also patched to be more strict.

function deepObjectExtend (target, source) {
    for (var prop in source) {
        if (source.hasOwnProperty(prop)) {
            if (target[prop] && typeof source[prop] === 'object') {
                deepObjectExtend(target[prop], source[prop]);
            }
            else {
                target[prop] = source[prop];
            }
        }
    }
    return target;
}