javascript 中数组对象操作方法

一、Filter方法：该方法会对原数组过滤并返回新数组，它不会改变原数组

let array2=[
          {id:'songxiaofeng',name:'宋晓锋'},
          {id:'xieyongqiang',name:'谢永强'},
          {id:'zhaoyutian',name:'赵玉田'},
          {id:'wangtianlai',name:'王天来'},
          {id:'zhaosi',name:'赵四'}
      ]
    let array=array2.filter(i=>i.id=="zhaosi");
    console.log('array',array);
    

二、Some方法：该方法会遍历数组元素，找到符合条件的元素返回true，否则返回false，它不会修改原数组。

let array2=[
          {id:'songxiaofeng',name:'宋晓锋'},
          {id:'xieyongqiang',name:'谢永强'},
          {id:'zhaoyutian',name:'赵玉田'},
          {id:'wangtianlai',name:'王天来'},
          {id:'zhaosi',name:'赵四'}
      ]
    let bool=array2.some(i=>i.id=="zhaosi");
    console.log('bool',bool);

三、Filter和Some：组合使用可实现在两个数组对象中找到相同的元素

let array1=[
  {id:'pichangshan',name:'皮常山'},
  {id:'xieguangkun',name:'谢广坤'},
  {id:'wanglaoqi',name:'王老七'},
  {id:'liuneng',name:'刘能'},
  {id:'zhaosi',name:'赵四'}
]
let array2=[
  {id:'songxiaofeng',name:'宋晓锋'},
  {id:'xieyongqiang',name:'谢永强'},
  {id:'zhaoyutian',name:'赵玉田'},
  {id:'liuneng',name:'刘能'},
  {id:'zhaosi',name:'赵四'}
]
 let array=array1.filter(i=>array2.some(item=>i.id==item.id));
 console.log('array',array);

四、Filter和Some：组合使用也可实现在两个数组对象中找到不相同的元素

let array1=[
  {id:'pichangshan',name:'皮常山'},
  {id:'xieguangkun',name:'谢广坤'},
  {id:'wanglaoqi',name:'王老七'},
  {id:'liuneng',name:'刘能'},
  {id:'zhaosi',name:'赵四'}
]
let array2=[
  {id:'songxiaofeng',name:'宋晓锋'},
  {id:'xieyongqiang',name:'谢永强'},
  {id:'zhaoyutian',name:'赵玉田'},
  {id:'liuneng',name:'刘能'},
  {id:'zhaosi',name:'赵四'}
]
 let array=array1.filter(i=>!array2.some(item=>i.id==item.id));
 let arrays=array2.filter(i=>!array1.some(item=>i.id==item.id));
 console.log('array',array);
 console.log('arrays',arrays);

五、Map：使用Map对象高效率查找，更适合大量数据使用

let array1=[
        {id:'pichangshan',name:'皮常山'},
        {id:'xieguangkun',name:'谢广坤'},
        {id:'wanglaoqi',name:'王老七'},
        {id:'liuneng',name:'刘能'},
        {id:'zhaosi',name:'赵四'}
      ]
    let array2=[
        {id:'songxiaofeng',name:'宋晓锋'},
        {id:'xieyongqiang',name:'谢永强'},
        {id:'zhaoyutian',name:'赵玉田'},
        {id:'liuneng',name:'刘能'},
        {id:'zhaosi',name:'赵四'}
      ]
    let map=new Map(array1.map(item=>[item.id,item]));
    console.log('map',map);
    let arrays=array2.filter(i=>map.has(i.id));
    console.log('arrays',arrays);

六：unionBy合并去重，属于 'lodash'下方法‌，需要安装和引入

import {unionBy,isEqual} from 'lodash';

  let array1=[
        {id:'pichangshan',name:'皮常山'},
        {id:'xieguangkun',name:'谢广坤'},
        {id:'wanglaoqi',name:'王老七'},
        {id:'liuneng',name:'刘能'},
        {id:'zhaosi',name:'赵四'}
      ]
    let array2=[
        {id:'songxiaofeng',name:'宋晓锋'},
        {id:'xieyongqiang',name:'谢永强'},
        {id:'zhaoyutian',name:'赵玉田'},
        {id:'liuneng',name:'刘能'},
        {id:'zhaosi',name:'赵四'}
      ]
    let array=unionBy(array2, array1, 'id');
    console.log('array',array)

七：isEqual判断两个对象是否相同， 属于 'lodash'下方法‌，需要安装和引入

import {unionBy,isEqual} from 'lodash';

    let params1={id:'zhaosi',name:'赵四'};
    let params2={id:'liuneng',name:'刘能'};
      
    let bool=isEqual(params2, params1);
    console.log('bool',bool)

也适用于数组对象比较是否相同

 let array1=[
        {id:'pichangshan',name:'皮常山'},
        {id:'xieguangkun',name:'谢广坤'},
        {id:'wanglaoqi',name:'王老七'},
        {id:'liuneng',name:'刘能'},
        {id:'zhaosi',name:'赵四'}
      ]
    let array2=[
        {id:'pichangshan',name:'皮常山'},
        {id:'xieguangkun',name:'谢广坤'},
        {id:'wanglaoqi',name:'王老七'},
        {id:'liuneng',name:'刘能'},
        {id:'zhaosi',name:'赵四'}
      ]
      
    let bool=isEqual(array1, array2);
    console.log('bool',bool)

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