update
Sets an item or property or items or properties on a list.
    list.update(newProps)
  
  Updates the properties on the list with newProps. Properties not in newProps will be set to undefined.
var list = new DefineList(["A","B"]);
list.assign({count: 0, skip: 2});
list.update({count: 1000});
list.get("count") //-> 1000
list.get("skip") //-> undefined
  
  Parameters
- newProps 
{Array}:Properties that need to be updated to the list instance