Filters are simple methods that modify the output of numbers, strings, variables and objects. They are placed within an output tag {{ }} and are separated with a pipe character |.
  <!-- rental.title = 'Great Boat' -->
    {{ rental.title | upcase }}
  GREAT BOAT
In the example above, rental is an object, title is its attribute, and upcase is the filter being applied.
Some filters require a parameter to be passed.
  {{ rental.title | remove: 'Great' }}
  Boat
Multiple filters can be used on one output. They are applied from left to right.
  <!-- rental.title = 'Great Boat' -->
    {{ rental.title | upcase | remove: 'GREAT'  }}
  BOAT