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IterableChangeRecord

interface

Record representing the item change information.

interface IterableChangeRecord<V> {
  currentIndex: number | null
  previousIndex: number | null
  item: V
  trackById: any
}

Property	Description
`currentIndex: number \| null`	Read-Only Current index of the item in `Iterable` or null if removed.
`previousIndex: number \| null`	Read-Only Previous index of the item in `Iterable` or null if added.
`item: V`	Read-Only The item.
`trackById: any`	Read-Only Track by identity as computed by the `TrackByFunction`.

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https://v12.angular.io/api/core/IterableChangeRecord