Edit in JSFiddle

angular
.module('MyApp', ['ngRoute'])
.config(function ($routeProvider) {
    $routeProvider
       .when('/kayttaja/:username', {
         controller: 'UserController',
           template: '<h2>Käyttäjän {{user.name}} profiili</h2>Kaverit:<ul ng-repeat="friend in user.friends"><li><a ng-href="#/kayttaja/{{friend}}">{{friend}}</a></li></ul>'
      })
      .otherwise({
        redirectTo: '/kayttaja/kalle'
      });  
}).
controller('UserController', function($scope, $routeParams) { 
   var users = {
    'arto': {
      name: 'Arto',
      friends: ['Kalle', 'Matti']
    },
    'kalle': {
      name: 'Kalle',
      friends: ['Elina', 'Arto', 'Matti']
    },
    'elina': {
      name: 'Elina',
      friends: ['Kalle']
    },
    'matti': {
      name: 'Matti',
      friends: ['Arto', 'Kalle']
    }
  };

  if(users[$routeParams.username.toLowerCase()]){
    
    $scope.user = users[$routeParams.username.toLowerCase()];
  }else{
    $scope.user = null;
  }
});

<div ng-app="MyApp"> 
    <div ng-view></div>
</div>