angularjs

1. ng-app

• define the root element of the angularjs application in html

2.  angular.module

• define the angularjs application in javascript

3. $scope

• the model in MVC pattern (html being the view, controller being the control) 

4. data binding

• ng-model="firstname"
• {{firstname}}
•  ng-model="firstname" (two way binding)

5. filter

• a normal filter '|' transform data
• a 'filter' filter select a subset of array

6. service

• a singleton object that provide utility
• example: $scope, $filter

reference

1. angular or react?