With block javascript

with-js.js

var person ={
    "employee":{
         "name": "Mohit Seth",
         "role": "Javascript Developer"
     }
}


/*this should be avoided*/

with(person.employee){
   console.log(name,role);
}

with-object-caching.js

/* This is better way to do it */

var obj = person.employee;

console.log( obj.name, obj.role);