Iterate over an Object keys using *ngFor

keys.pipe.ts

/**
 * Use like *ngFor="let key of ( object | keys )"
 */
@Pipe({ name: 'keys', pure: false })
export class KeysPipe implements PipeTransform {
    transform(value: any, args: any[] = null): any {
        if(!value) return [];
        return Object.keys(value);
    }
}