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IterableDiffer
interface
A strategy for tracking changes over time to an iterable. Used by NgForOf to respond to changes in an iterable by effecting equivalent changes in the DOM.
interface IterableDiffer<V> {
  diff(object: NgIterable<V>): IterableChanges<V> | null
}
   Class implementations
Methods
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          diff() 
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Compute a difference between the previous state and the new   | 
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          | 
      
object | 
            NgIterable | 
            containing the new value.  | 
           
Returns
IterableChanges<V> | null: an object describing the difference. The return value is only valid until the next diff() invocation.
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Licensed under the Creative Commons Attribution License 4.0.
 https://v11.angular.io/api/core/IterableDiffer