Track By Key
The trackByKey directive will create function for *ngFor directive and will be using as trackBy.
Using trackByKey
An example in COMPONENT.template.html
.
<ng-container *ngFor="
let item of [
{ animal: '🦊' },
{ animal: '🦄' }
] trackByKey 'animal'">
{{ item.animal }}
</ng-container>
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