watch (obj, _keyPath) private
Defined in packages/ember-metal/lib/watching.js:24
Starts watching a property on an object. Whenever the property changes, invokes Ember.propertyWillChange and Ember.propertyDidChange. This is the primitive used by observers and dependent keys; usually you will never call this method directly but instead use higher level methods like Ember.addObserver()
Parameters:
obj
_keyPath String