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* For example: `item in items track by $id(item)`. A built in `$id()` function can be used to assign a unique
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* `$$hashKey` property to each item in the array. This property is then used as a key to associated DOM elements
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* with the corresponding item in the array by identity. Moving the same object in array would move the DOM
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* element in the same way ian the DOM.
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* element in the same way in the DOM.
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*
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* For example: `item in items track by item.id` is a typical pattern when the items come from the database. In this
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* case the object identity does not matter. Two objects are considered equivalent as long as their `id`
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