AngularJS Example:

HTML

<link rel="stylesheet" href="http://twitter.github.com/bootstrap/assets/css/bootstrap.css">
<div ng-app>
  <div ng-controller="MainCtrl">
      {{array}}
      <br/>
      {{arrayToString(array)}}
      <br/>
      {{array.join(", ")}}
  </div>
</div>

JavaScript

function MainCtrl($scope) {
    $scope.array = ["tes","1","2","bla"];
    
    $scope.arrayToString = function(string){
        return string.join(", ");
    };
}