ionic2Constructor and OnInit


In respect of ionic2 the constructor: in simple terms we use it to create instance of our plugins, services etc. for example: You have a page(view) where you want to show the list of all students, and you have a json file that contains all the students (this file is your data file) what you have to do is to create a service in this service you will create a method and hit a http.get request to get the json data, so here you need what? http simply do this way: