angular.isArray()
HTML
<script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.4.1/angular.min.js"></script>
<h1 id="test">angular.isArray()</h1>
JavaScript
var array = [];
console.log(angular.isArray(array)); // true
document.write("This is an array");
var string = '';
console.log(angular.isArray(string)); // false