js sort array by date string All In One

bug


const log = console.log;

const arr = [
  { title: 'markdown title', date: '2021-01-01' },
  { title: 'markdown title', date: '2022-11-01' },
  { title: 'markdown title', date: '2022-11-30' },
  { title: 'markdown title', date: '2022-12-01' },
  { title: 'markdown title', date: '2022-12-31' },
  { title: '✅ markdown title', date: '2012-01-01' }
];

// date string sort bug ❌
const sorted = arr.sort(({ date: a }, { date: b }) => {
  if (a < b) {
    return 1;
  } else if (a > b) {
    return -1;
  } else {
    return 0;
  }
});

solution


const log = console.log;

const arr = [
  { title: 'markdown title', date: '2021-01-01' },
  { title: 'markdown title', date: '2022-11-01' },
  { title: 'markdown title', date: '2022-11-30' },
  { title: 'markdown title', date: '2022-12-01' },
  { title: 'markdown title', date: '2022-12-31' },
  { title: '✅ markdown title', date: '2012-01-01' }
];

// const meta = arr.map(obj => obj.metadata);
// log(`meta =`, meta);
// return arr;
// const sorted = arr.sort(({ date: a }, { date: b }) => {
//   // 升序排序，最旧的在最前面 ❌
//   if (a < b) {
//     return -1;
//   } else if (a > b) {
//     return 1;
//   } else {
//     return 0;
//   }
// });
const sorted = arr.sort(({ date: a }, { date: b }) => {
  // 降序排序，最新的在最前面 ✅
  if (a < b) {
    return 1;
  } else if (a > b) {
    return -1;
  } else {
    return 0;
  }
});
log(`sorted =`, sorted.map(obj => obj.metadata));
return sorted;