mergeAdd.js

function $mergeAdd(){
	var mix = {};
	var obs = Array.flatten(arguments);
	for (var i = 0, l = obs.length; i < l; i++){
		var object = obs[i];
		if ($type(object) != 'object') continue;
		for (var key in object){
			var object_prop = object[key], mp = mix[key];
			
			if(mp && $type(object_prop) == 'object' && $type(mp) == 'object')
				mix[key] = $mergeAdd(mp, object_prop);
				
			else if(mp && $type(object_prop) == 'number' && $type(mp) == 'number')
				mix[key] = mp + $unlink(object_prop);
				
			else if(mp && String(mp).replace(/[^\-\d\.]/g,'').toFloat() && object_prop.replace(/[^\-\d\.]/g,'').toFloat() )
				mix[key] = String(mp).replace(/[^\-\d\.]/g,'').toFloat() + object_prop.replace(/[^\-\d\.]/g,'').toFloat();
				
			else
				mix[key] = $unlink(object_prop);
		}
	}
	return mix;
};


// ===========
// = TESTING =
// ===========

function pp(object){
	switch ($type(object)){
	case 'object':
		object = $H(object);
		
		var h = '<table>';
		object.each(function(value, key){
			h += '<tr><th> {key} </th><td> {value} </td></tr>'.substitute({key:key, value: pp(value) })
		})
		h += '</table>'
		return h
		
		break;
	case 'array':
		object = $A(object);
		
		var h = '';
		object.each(function(value, key){
			h += '<div> {value} </div>'.substitute({value: pp(value) })
		})
		return h
		
		break;
	case false: return 'false'; break;
	case 'string':
	case 'number':
	case 'boolean':
	case 'date':
	default: return object.toString();
	}
	
};

var ob1={
	a:1
},ob2={
	a:2
},ob1_2={
	a:3
};

document.write("This")
document.write(pp( $mergeAdd(ob1,ob2) ));
document.write("Should equal")
document.write(pp( ob1_2 ));


ob1={
	x:"Fred",
	z:"1",
	a:1,
	b:1,
	c:1
},ob2={
	x:"Fred",
	z:"2",
	a:2,
	b:2,
	c:2
},ob1_2={
	x:"Fred",
	z:"3",
	a:3,
	b:3,
	c:3
};

document.write("This")
document.write(pp( $mergeAdd(ob1,ob2) ));
document.write("Should equal")
document.write(pp( ob1_2 ));


ob1={
	x:"Fred",
	z:"$1",
	a:1,
	b:1,
	c:1
},ob2={
	x:"Fred",
	z:"$2",
	a:2,
	b:2,
	c:2
},ob1_2={
	x:"Fred",
	z:3,
	a:3,
	b:3,
	c:3
};

document.write("This")
document.write(pp( $mergeAdd(ob1,ob2) ));
document.write("Should equal")
document.write(pp( ob1_2 ));