import { Pipe, PipeTransform } from "@angular/core"; import { FormGroup } from "@angular/forms"; @Pipe({ name: 'datasetInSection' }) export class DatasetInSectioPipe implements PipeTransform{ transform(datasets: FormGroup[], args: string): FormGroup[] { let values = []; for(var dataset of datasets){ if(dataset.get('dmpSectionIndex').value == args){ values.push(dataset); } } return values; } }