js对象数组去重的方法

const arr = [
  { id: 1, name: 'Alice' },
  { id: 2, name: 'Bob' },
  { id: 1, name: 'Alice' }
];

const unique = arr.reduce((acc, curr) => {
  if (!acc.some(item => item.id === curr.id)) {
    acc.push(curr);
  }
  return acc;
}, []);

const unique = Array.from(
  new Map(arr.map(item => [item.id, item])).values()
);

const arr = [
  { name: 'Alice', age: 25 },
  { name: 'Bob', age: 30 },
  { name: 'Alice', age: 25 }
];

const seen = new Set();
const unique = arr.filter(item => {
  const key = `${item.name}-${item.age}`;
  if (seen.has(key)) {
    return false;
  }
  seen.add(key);
  return true;
});

const unique = arr.filter((item, index) => {
  return index === arr.findIndex(obj => 
    JSON.stringify(obj) === JSON.stringify(item)
  );
});

import { uniqBy } from 'lodash';

const unique = uniqBy(arr, 'id'); // 按id去重
// 或
const unique = uniqBy(arr, item => `${item.name}-${item.age}`);