<p-dataTable [value]="results">
<p-column *ngFor="let col of resultsFieldArray" [field]="col.field_name" [header]="col.field_label">
    <ng-template let-col let-user="rowData" let-i="rowIndex" pTemplate="body">
        <button type="button" pButton (click)="editUser(user,i)"></button>
    </ng-template>
</p-column>
</p-dataTable>

export class AppComponent {
private resultsFieldArray: Array<any> = [];
private results: Array<any> = [];

constructor() {
this.resultsFieldArray = [{
            "field_label": "Contact Type",
            "field_name": "contact_type"
        }, {
            "field_label": "First Name",
            "field_name": "first_name"
        }, {
            "field_label": "Last Name",
            "field_name": "last_name"
        }, {
            "field_label": "Email",
            "field_name": "email"
        }];

        this.results = [{
            "contact_type": "individual",
            "first_name": "chandru",
            "last_name": "ismera",
            "email": "xyz@gmail.com"
        }, {
            "contact_type": "individual",
            "first_name": "david",
            "last_name": "williams",
            "email": "xyz@gmail.com"
        }, {
            "contact_type": "individual",
            "first_name": "alex",
            "last_name": "smith",
            "email": "xyz@gmail.com"
        }];
}

editUser(user: any, index: number) {
        console.log('user', user);
        console.log("here", index);
    }
}