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copied!<p><strong>Angular 1.0.5 and 1.0.4:</strong></p> <ul> <li><a href="http://docs.angularjs.org/api/ng.$rootScope.Scope#Properties" rel="nofollow noreferrer">Scope</a> has two useful undocumented properties: <ol> <li><code>$parent</code> - can be used as a hack for binding to a primitive property in a parent scope - <a href="https://stackoverflow.com/a/13850702/215945">example</a></li> <li><code>$$phase</code> - can be used to determine if a $digest is already in progress - see <a href="https://stackoverflow.com/a/12859093/215945">this SO answer</a></li> </ol></li> <li><a href="http://docs.angularjs.org/api/ng.directive:ngSwitch#Parameters" rel="nofollow noreferrer">ng-switch</a> has an undocumented <code>change</code> parameter that accepts an expression (<a href="http://plnkr.co/edit/HpTRNv?p=preview" rel="nofollow noreferrer">example plnkr</a>)</li> <li><a href="http://docs.angularjs.org/api/ng.directive:select" rel="nofollow noreferrer">select</a> has an undocumented <code>ng-change</code> parameter that accepts an expression</li> <li><a href="http://docs.angularjs.org/api/ng.$compile.directive.Attributes#Methods" rel="nofollow noreferrer">Attributes</a> has an undocumented <code>$observe</code> method (although it is mentioned on the <a href="http://docs.angularjs.org/guide/directive#Attributes" rel="nofollow noreferrer">Directives</a> page)</li> <li><a href="http://docs.angularjs.org/api/ng.$cacheFactory" rel="nofollow noreferrer">$cacheFactory</a> has two undocumented methods (<a href="http://jsfiddle.net/moderndegree/yYEXN/" rel="nofollow noreferrer">example fiddle</a>) <ol> <li><code>get()</code></li> <li><code>info()</code></li> </ol></li> <li>the <a href="http://docs.angularjs.org/api/ng.$location" rel="nofollow noreferrer">$location</a> service has two undocumented events <ol> <li><code>$locationChangeStart(evt, newUrl, oldUrl)</code> (<a href="https://stackoverflow.com/a/13918833/215945">example</a>)</li> <li><code>$locationChangeSuccess(evt, newUrl, oldUrl)</code> (see also <a href="https://stackoverflow.com/questions/15006849/angularjs-whats-the-difference-between-locationchangesuccess-and-locationch">What's the difference between $locationChangeSuccess and $locationChangeStart?</a>)</li> </ol></li> <li>use ng-value (undocumented) with <code>input type="radio"</code>, see <a href="http://docs.angularjs.org/api/ng.directive:input.radio#comment-880774822" rel="nofollow noreferrer">Disqus comment</a> in API docs</li> </ul>

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