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Retrieves the value of a property from the object. The source array changes often and in large batches. A computed property that returns true if the value of the dependent property is null, an empty string, empty array, or empty function. ... Once you wrap your head around that there really isn’t anything new to do. You can also define what Ember should do when setting a computed property. A computed property transforms an object literal with object's accessor function(s) into a property. By default the function backing the computed property will only be called once and the result will be cached. Who knows, it’s the future we’re talking about and anything can happen, right? Steffan Penner has a great video on observers that I would recommend you watch to truly understand why they are potentially hazardous to your codebase.. ... a cross-browser supported library we can include during run-time, or something else entirely. What does .property() do? You must return the new intended value of the computed property from the setter function. We rely on array property change coalescing for this to not be a performance issue. A computed property will only re-evaluate when some of its reactive dependencies have changed. In the future, they might become deferred as well. This means as long as message has not changed, multiple access to the reversedMessage computed property will immediately return the previously computed result without having to run the function again. See this jsbin. This method is usually similar to using object[keyName] or object.keyName, however it supports both computed properties and the unknownProperty handler.. Because get unifies the syntax for accessing all these kinds of properties, it can make many refactorings easier, such as replacing a simple property with a computed property… In a nutshell, it’s a property whose value is computed the first time it’s asked for. If you try to set a computed property, it will be invoked with the key (property name), and the value you want to set it to. You can define the computed property as a function and when someone asks for it, Ember will automatically invoke the function and treat the return value like value of the property. At the moment, while bindings are deferred (lazy), observers and by extension computed properties trigger immediately. In the meantime, you can use Ember.run.once as a workaround to schedule a deferred function call, which will be run only once. Example As a general rule you want to avoid the use of observers whenever possible. You can specify various properties that your computed property depends on. attrs = Ember.keys(observedObject); var c = Ember.computed(function() { // Do stuff when something changes }) Ember.defineProperty(target, propertyName, c.property.apply(c, attrs)); Here is a working jsbin. Creating an observer instead of a property should be possible using a similar approach. Here’s a very well-known example: Article, EmberJS. Having 2 computed properties based on the same dependency only one computed property runs. in function(){}.property() Ember 2, filter relationship models (hasMany,… ember.js, ember-cli: Outlets not nesting properly; Ember Computed Property vs Ember Observer; Controller and model data store access ember.js; ember.js sending actions to controllers from views; Ember.js, set(), and computed properties Ember Computed Property Caveats. This will for… Ember data - the calculated property does not fire when the model is updated with createRecord For reasons beyond the scope of this question, I have to populate an Ember data model named Activity in my SearchRoute using Ember.$.getJSON in the model hook like this: App.SearchRoute = Ember.Route.extend({ model: function (params) { // Create a pr Note: When using Ember.computed.empty to watch an array make sure to use the array. [] syntax so the computed can subscribe to transitions from empty to non-empty states. In your case the load() function is returning a promise which is not something you want to return from a computed property so …

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