interface EvaluateHistoryItem {
evaluate: string;
error?: string;
result?: string;
runTimeMs?: number;
saved?: boolean;
}

export class EvaluateComponent implements OnInit, AfterViewInit {
   ...  ...  ...
   ...  ...  ...
   public history$ = new BehaviorSubject<EvaluateHistoryItem[]>([]);
   ...  ...  ...
   public uploadFile(element: any) {
       let uploadedFile = document.getElementById('uploadedFile');
       let files: File[] = element.srcElement.files;
       let file: File = files[0];

       let reader = new FileReader();

       let resultSet: string[] = [];

       reader.onloadend = (result) => {
           // replace new lines with commas and then split upon commas but not the ones inside quotes
           let columns: string[] = reader.result.replace(/n/g, ',').split(/,(?=(?:(?:[^"]*"){2})*[^"]*$)/);

           for (let i = 0; i < columns.length - 1; i++) {
               resultSet.push(columns[i]);
           }
       };

    let history: EvaluateHistoryItem[] = this.history$.getValue();
    // ... here I need to map values from resultSet
    // ....
    this.history$.next(history);
}