How to get unique records from this array. I need to get unique {{ subitem.author }} from this array of items.
<div *ngFor="let item of items">
<ion-list *ngFor="let subitem of item.items" (click)="authorquotes(subitem.author);">
<ion-item >
{{ subitem.author }}
</ion-item>
</ion-list>
</div>
In array having multiple records. From that array, I need to filter unique authors.
You have to create a pipe that filters the array with unique items:
@Pipe({
name: 'filterUnique',
pure: false
})
export class FilterPipe implements PipeTransform {
transform(value: any, args?: any): any {
// Remove the duplicate elements
let uniqueArray = value.filter(function (el, index, array) {
return array.indexOf (el) == index;
});
return uniqueArray;
}
}
Then you can apply your pipe:
<div *ngFor="let item of items | filterUnique">
<ion-list *ngFor="let subitem of item.items" (click)="authorquotes(subitem.author);">
<ion-item >
{{ subitem.author }}
</ion-item>
</ion-list>
</div>
Working demo: https://plnkr.co/edit/yxvoKVD3Nvgz0T3AB7w3?p=preview