$watchGroup(watchExpressions, listener); A variant of
$watchCollection(obj, listener); Shallow watches the properties of an object and fires whenever any of the properties change (for arrays
type in module ng
$parsers Array.<Function>
removeAll(); Clears the cache object of any entries.
$setUntouched(); Sets the control to its untouched state. This method can be called to remove the ng-touched class
$setDirty(); Sets the control to its dirty state. This method can be called to remove the ng-pristine class and
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