Angular service creation (Provider with Config option)

provider.js

(function () {

	var app = angular.module('app', []);

	app.provider('books',function(){
		this.$get = function(){
			var appName = "BookLogger";

			var version = '1.0';

			if(varsionFlag){
				appName += ' ' + version;
			}

			return {
				appName : appName
			};
		};
		
		var varsionFlag = false;
		this.setVersionInclude = function (value) {
			varsionFlag = value;
		};
	});

	app.config(function(booksProvider){
		booksProvider.setVersionInclude(true);
	});

}());