Javascript 简化数组索引作为参数

Question

我有以下代码可以 100% 工作，但我不禁觉得他们是一种更好的或更简单的编写方法，或者可能不是全部，我们将不胜感激任何帮助

const entity: any = response.organisation;

if (Array.isArray(responseKey)) {
  // responseKey e.g. ['site', 'accounts']
  // I feel this two declarations can be refactored
  const list = this.flattenGraphqlList<T>(entity[responseKey[0]][responseKey[1]]);
  const {totalCount} = entity[responseKey[0]][responseKey[1]];

  return {list, totalCount};
}

const list = this.flattenGraphqlList<T>(entity[responseKey]);
const {totalCount} = entity[responseKey];

return {list, totalCount};

Answer 1

不要每件事都做两次：

const entity: any = response.organisation;

const object = Array.isArray(responseKey) 
  ? entity[responseKey[0]][responseKey[1]] // responseKey e.g. ['site', 'accounts']
  : entity[responseKey];

const list = this.flattenGraphqlList<T>(object);
const {totalCount} = object;
return {list, totalCount};

我猜你能找到一个比 object 更具描述性的名称 :-)

对于最后几行，我个人不希望使用解构，但这更像是一种风格选择：

return {
  list: this.flattenGraphqlList<T>(object),
  totalCount: object.totalCount
};

Javascript 简化数组索引作为参数

Javascript simplify array indexing as arguments

javascript

arrays

indexing

refactoring

ecmascript-6