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    <p>Here is a working example of such a service: <a href="http://plnkr.co/edit/fJwRER?p=preview" rel="noreferrer">http://plnkr.co/edit/fJwRER?p=preview</a>. It creates a <code>$q</code> deferred object that will be resolved when the debounced function is finally called.</p> <p>Each time the <code>debounce</code> function is called the promise to the next call of the inner function is returned.</p> <pre><code>// Create an AngularJS service called debounce app.factory('debounce', ['$timeout','$q', function($timeout, $q) { // The service is actually this function, which we call with the func // that should be debounced and how long to wait in between calls return function debounce(func, wait, immediate) { var timeout; // Create a deferred object that will be resolved when we need to // actually call the func var deferred = $q.defer(); return function() { var context = this, args = arguments; var later = function() { timeout = null; if(!immediate) { deferred.resolve(func.apply(context, args)); deferred = $q.defer(); } }; var callNow = immediate &amp;&amp; !timeout; if ( timeout ) { $timeout.cancel(timeout); } timeout = $timeout(later, wait); if (callNow) { deferred.resolve(func.apply(context,args)); deferred = $q.defer(); } return deferred.promise; }; }; }]); </code></pre> <p>You get the return value from the debounced function by using the then method on the promise.</p> <pre><code>$scope.addMsg = function(msg) { console.log('addMsg called with', msg); return msg; }; $scope.addMsgDebounced = debounce($scope.addMsg, 2000, false); $scope.logReturn = function(msg) { console.log('logReturn called with', msg); var promise = $scope.addMsgDebounced(msg); promise.then(function(msg) { console.log('Promise resolved with', msg); }); }; </code></pre> <p>If you call <code>logReturn</code> multiple times in quick succession you will see the <code>logReturn</code> call logged over and over but only one <code>addMsg</code> call logged.</p>
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    1. POHow to write a debounce service in AngularJS
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    1. USGian Marco Gherardi
    1. USPete BD
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    1. POHow to write a debounce service in AngularJS
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    1. COThis is brilliant. It should be part of the core code.
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      1. USRoy Truelove
    2. COOut of curiosity, do you find the returned promises of any use? For instance in the case of an autocomplete, it would be nice to have a single promise that tells me what the user finally typed, but not a promise per keystroke. I'm starting to feel like you can get away with promises, and you can get away with debouncing + callback, but not both.
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    3. COThis is what you do get! The promise you receive is the result of finally calling the inner function. You'll notice that in the example, "Resolved: ..." is only written to the console once per debounce and that "value" will be the return value from $scope.addMsg()
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