WE wanted to do a function that removes by key:
The delete operator allows we to remove a property from an object.
The following examples all do the same thing.
If you're interested, read Understanding Delete for an in-depth explanation.
If we are using Underscore.js or Lodash, there is a function 'omit' that will do it.
If we want to modify the current object, assign the returning object to the current object.