e todo's based on their isDone property. 

To facilitate this, Ember...">

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  <meta property="og:title" content="Computed Properties and Aggregate Data - The Object Model - Ember Guides">

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  <meta property="og:description" content="Sometimes you have a computed property whose value depends on the properties of items in an array. For example, you may have an array of todo items, and want to calculate the incomplete todo's bas