js集合set去重方法_js集合set去重技巧详解

function uniqueArray(arr) {
  return [...new Set(arr)];
}

// 示例
const myArray = [1, 2, 2, 3, 4, 4, 5];
const uniqueArrayResult = uniqueArray(myArray);
console.log(uniqueArrayResult); // 输出: [1, 2, 3, 4, 5]

const arrWithNaN = [1, NaN, NaN, 2];
const uniqueArrWithNaN = [...new Set(arrWithNaN)];
console.log(uniqueArrWithNaN); // 输出: [1, NaN, NaN, 2]

const arrWithObjects = [{a: 1}, {a: 1}];
const uniqueArrWithObjects = [...new Set(arrWithObjects)];
console.log(uniqueArrWithObjects); // 输出: [{a: 1}, {a: 1}]

// 假设你有一个链表 toArray() 方法将其转换为数组
// 示例：
// class LinkedList {
//   constructor() {
//     this.head = null;
//   }
//   toArray() {
//     let arr = [];
//     let current = this.head;
//     while(current) {
//       arr.push(current.data);
//       current = current.next;
//     }
//     return arr;
//   }
// }

// const linkedList = new LinkedList();
// // ... 向链表添加数据 ...

// const arrayFromLinkedList = linkedList.toArray();
// const uniqueArrayFromLinkedList = [...new Set(arrayFromLinkedList)];

// // 然后你可以将 uniqueArrayFromLinkedList 转换回链表

function uniqueArrayByProperty(arr, property) {
  const map = new Map();
  return arr.filter((item) => {
    if (!map.has(item[property])) {
      map.set(item[property], true);
      return true;
    }
    return false;
  });
}

// 示例
const myArray = [{id: 1, name: 'A'}, {id: 2, name: 'B'}, {id: 1, name: 'C'}];
const uniqueArrayById = uniqueArrayByProperty(myArray, 'id');
console.log(uniqueArrayById); // 输出: [{id: 1, name: 'A'}, {id: 2, name: 'B'}]