With the Move String Into Array features , the identifiers of an object could be replace to a string , and be moved to the beginner of the code.
That's mean the member name and the statement which access the member will be splited into two parts.
For example , it's easy to read this code
o.style.color='red';
With this feature, the code will look like as this
o[a[23]][a[52]]=a[145];