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docs: add doc for TrackByFunction (#27377) 

PR Close #27377
This commit is contained in:
Judy Bogart 2019-01-16 14:40:03 -08:00 committed by Alex Rickabaugh
parent b6819fe9bb
commit 522e4ea898
1 changed files with 1 additions and 3 deletions
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4
packages/core/src/change_detection/differs/iterable_differs.ts
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@ -119,10 +119,8 @@ export interface CollectionChangeRecord<V> extends IterableChangeRecord<V> {}
/** /**
* An optional function passed into the `NgForOf` directive that defines how to track * An optional function passed into the `NgForOf` directive that defines how to track
* changes for items in an iterable. * changes for items in an iterable.
* The function takes the iteration index and item ID.
* When supplied, Angular tracks changes by the return value of the function. * When supplied, Angular tracks changes by the return value of the function.
* @param index The iteration index.
* @param item The item ID.
* @return The value to use for tracking changes.
* *
* @publicApi * @publicApi
*/ */