test('calling removeListener without method should remove all listeners', function() {
var obj = {}, F = function() {}, F2 = function() {};
equal(hasListeners(obj, 'event!'), false, 'no listeners at first');
addListener(obj, 'event!', F);
addListener(obj, 'event!', F2);
equal(hasListeners(obj, 'event!'), true, 'has listeners');
removeListener(obj, 'event!');
equal(hasListeners(obj, 'event!'), false, 'has no more listeners');
});
test('hasListeners tells you if there are listeners for a given event', function() {
var obj = {}, F = function() {}, F2 = function() {};
equal(hasListeners(obj, 'event!'), false, 'no listeners at first');
addListener(obj, 'event!', F);
addListener(obj, 'event!', F2);
equal(hasListeners(obj, 'event!'), true, 'has listeners');
removeListener(obj, 'event!', F);
equal(hasListeners(obj, 'event!'), true, 'has listeners');
removeListener(obj, 'event!', F2);
equal(hasListeners(obj, 'event!'), false, 'has no more listeners');
addListener(obj, 'event!', F);
equal(hasListeners(obj, 'event!'), true, 'has listeners');
});
hasEnumerableObservers: computed(function() {
return hasListeners(this, '@enumerable:change') || hasListeners(this, '@enumerable:before');
}),
hasArrayObservers: computed(function() {
return hasListeners(this, '@array:change') || hasListeners(this, '@array:before');
}),
has: function(name) {
return hasListeners(this, name);
}
removeObserver(this, key, target, method);
},
/**
Returns `true` if the object currently has observers registered for a
particular key. You can use this method to potentially defer performing
an expensive action until someone begins observing a particular property
on the object.
@method hasObserverFor
@param {String} key Key to check
@return {Boolean}
@private
*/
hasObserverFor(key) {
return hasListeners(this, key + ':change');
},
/**
Retrieves the value of a property, or a default value in the case that the
property returns `undefined`.
```javascript
person.getWithDefault('lastName', 'Doe');
```
@method getWithDefault
@param {String} keyName The name of the property to retrieve
@param {Object} defaultValue The value to return if the property value is undefined
@return {Object} The property value or the defaultValue.
@public
hasObserverFor: function(key) {
return hasListeners(this, key+':change');
},