Cleancode：在承诺中尝试/捕捉

我正在开发Redux-Form自动取款机，找到了这段代码。这对我来说很有效，但有没有更干净的方式来用ES6风格来写这篇文章？

const asyncValidate = (values/* , dispatch */) => {
  return new Promise((resolve, reject) => {
    try {
      if (['john', 'paul', 'george', 'ringo'].includes(values.name)) {
        const error = {
          name: 'That username is taken'
        };
        throw error;
      }
      resolve();
    } catch (e) {
      reject(e);
    }
  });
};

感谢您的帮助

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解决方案

const asyncValidate = (values/* , dispatch */) => {
  return new Promise((resolve, reject) => {
    const errors = {};
    if (['john', 'paul', 'george', 'ringo'].includes(values.name)) {
      errors.name = 'That username is taken';
    }
    reject(errors);
  });
};

可能是更干净的方式？！

---

解决方案

try/catch在承诺链和承诺执行人功能中是多余的。

抛出的任何错误都会自动转换为拒绝您应该返回的承诺。调用您的函数的承诺代码负责这一点。那就去做吧：

const asyncValidate = values => new Promise(resolve => {
  if (['john', 'paul', 'george', 'ringo'].includes(values.name)) {
    throw { name: 'That username is taken'};
  }
  resolve();
});

并转换为拒绝。