🚀 go-pugleaf

Some building blocks:

To iterate the members of an object
for( n in props ) { alert(props[n]); }

To check whether another object has such a member:
if( other[n]!=undefined ) ...

To remove a named member:
delete other[n];

I wonder though how you would detect differences caused by nested styles.

Regarding toSource(), you could use that as a key in an associative array.
var styleMap = [];
var props = myStyle.properties;
delete props.name;
delete props.otherIgnoredAttribute;
var key = props.toSource();
var found = styleMap[key];
if( found!=undefined ) alert("Hey, we have a similar style"+ found.name);
else styleMap[key] = myStyle;

Dirk