在Angular 7中查找数组中唯一对象的数量

import { Component } from '@angular/core';

@Component({
  selector: 'app-root',
  template: `
    <div>
      <p>数组中唯一对象的数量为: {{ uniqueObjectCount }}</p>
    </div>
  `,
})
export class AppComponent {
  uniqueObjectCount: number;

  constructor() {
    const array = [
      { id: 1, name: 'Object 1' },
      { id: 2, name: 'Object 2' },
      { id: 1, name: 'Object 1' },
      { id: 3, name: 'Object 3' },
      { id: 2, name: 'Object 2' },
    ];

    const uniqueObjects = {};

    array.forEach((obj) => {
      const key = JSON.stringify(obj);
      uniqueObjects[key] = (uniqueObjects[key] || 0) + 1;
    });

    this.uniqueObjectCount = Object.keys(uniqueObjects).length;
  }
}