Modifying jQuery extend to push array items within objects but extend other objects

Question

I\'m thinking this must be a common problem but can\'t seem to find the solution. Using JSON config files to extend a jQuery object that contains objects and arrays.

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Answer 1

I know this is old, but I found this post and used Steve Blacks code above but found a few bugs :

1. Theres an extra '}' before the 'continue' in the isArray section.

2. If the source did not have the array at all, it would throw an error, so I added this into the isArray section

   if ( !dst[p] ) {
       dst[p] = src[p];
       continue;
   }
   

So the finished code looks like this :

function isDOMNode(v) {
    if ( v===null ) return false;
    if ( typeof v!=='object' ) return false;
    if ( !('nodeName' in v) ) return false; 
    var nn = v.nodeName;
    try {
      v.nodeName = 'is readonly?';
    } catch (e) {
      return true;
    }
    if ( v.nodeName===nn ) return true;
    v.nodeName = nn;
    return false;
}

function mergeRecursive() {
    // _mergeRecursive does the actual job with two arguments.
    var _mergeRecursive = function (dst, src) {
        if ( isDOMNode(src) || typeof src!=='object' || src===null) {
            return dst; 
        }

        for ( var p in src ) {
            if ($.isArray(src[p])) {
                if ( !dst[p] ) {
                    dst[p] = src[p];
                    continue;
                }
                $.merge(dst[p],src[p]);
                var dupes = {}, singles = [];
                $.each( dst[p], function(i, el) {
                    if ((dupes[el.name] > -1) &&  (el.name)) {
                        $.extend(singles[dupes[el.name]],el);
                    } else {
                        if (el.name) {
                            dupes[el.name] = i;
                        }
                     singles.push(el);
                   }
                });
                dst[p] = singles;
                continue;        
            }

            if ( !src.hasOwnProperty(p) ) continue;
            if ( src[p]===undefined )     continue;
            if ( typeof src[p]!=='object' || src[p]===null) {
                dst[p] = src[p];
            } else if ( typeof dst[p]!=='object' || dst[p]===null ) {
                dst[p] = _mergeRecursive(src[p].constructor===Array ? [] : {}, src[p]); 
            } else {              
                _mergeRecursive(dst[p], src[p]);
            }
        }
        return dst;
    }

    // Loop through arguments and merge them into the first argument. 
    var out = arguments[0];
    if ( typeof out!=='object' || out===null) return out;
    for ( var i=1, il=arguments.length; i