typescript-coding-standard

Syntax

User optional chaining operator ? instead of &&

const user = {
  name: 'John',
  address: {
    city: 'New York',
    state: 'NY'
  }
};

const city = user && user.address && user.address.city; // old way
const city = user?.address?.city; // new way

这种方式确实简单很多，但是处理Unit Test可能会麻烦一些。

Use nullish coalescing operator ?? instead of ||

const name = user.name || 'Guest'; // old way
const name = user.name ?? 'Guest'; // new way