Built in filters

Angular comes with several filters. For example {12.9 | currency} --> {{12.9 | currency}}
We can use more than one filter. {12.9 | number:0 | currency} --> {{12.9 | number:0 | currency }}

Custom filters

We can write custom filters. Our custom filter writes title-cased strings:
The text from input will be so formatted: {myText | titleCase}:

We define filter in our module: myModule.filter('titleCase', function () {...}
Our function, known here as 'titleCase' returns an inner function: return function (input) {...] which gets 'input'-parameter.
Inner function splits words by ' ', replaces fist letter of each word to upper case, joins words by ' ', and returns string.