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    copied!<p>A <strong>promise</strong> represents a future value, usually a future result of an asynchronous operation, and allows us to define what will happen once this value becomes available, or when an error occurs.</p> <p><strong>Reference</strong></p> <pre><code>var promise = asyncFunction(parameters); promise.then( function (result) { // Do Something with the result }, function (error) { // Handle error (exception, etc). }); </code></pre> <p>You can wrap any value with a promise, using the utility method <code>$q.when()</code>. </p> <ul> <li>$q.when(promise) → promise </li> <li>$q.when(nonPromise) → a new promise, that will </li> <li>asynchronously resolve to the given value nonPromise. </li> </ul> <p><strong>==============================</strong></p> <p>In your example:</p> <p><em>HTML</em></p> <pre><code>&lt;div ng-app ng-controller="testController"&gt; &lt;p&gt;Direct property: {{ property }}&lt;/p&gt; &lt;p&gt;Function returning property: {{ getProperty() }}&lt;/p&gt; &lt;p&gt;Direct promise: {{ promise }}&lt;/p&gt; &lt;p&gt;Function returning promise: {{ out }}&lt;/p&gt; &lt;/div&gt; </code></pre> <p><em>JS</em></p> <pre><code>function testController($scope, $q) { var deferred = $q.defer(); deferred.resolve('some lazy text'); $scope.promise = deferred.promise; $scope.out = $scope.promise.then(function (result) { console.log(result); return result; }); $scope.property = 'some text'; $scope.getProperty = function () { return $scope.property; }; } </code></pre> <p>Demo <a href="http://jsfiddle.net/KnTtv/2/" rel="nofollow">Fiddle</a></p>
 

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