block44.ts

function unwrapAxiosResponse<T>(request: AxiosPromise<object>, responseMapper: (object) => T): Promise<T> {
  return new Promise<T>((resolve, reject) => {
    request
      .then(response => {
        resolve(responseMapper(response.data))
      })
      .catch(error => {
        reject(error)
      })
  });
}

export function fetchTasks(): Promise<Array<Task>> {
  return unwrapAxiosResponse(axios.get('/api/tasks', config), (object) => {
    return object.map(task => new Task(task.id, task.title))
  });
}