filter和includes

2024-11-03

数组的filter与includes方法

题目:编写函数 array_diff(a,b),传入两个数组a,b,将数组a中包含b的值全部去掉,重复的也去掉,返回去掉之后新数组 function array_diff(a, b) { return a.filter(e => !b.includes(e));} ex: array_diff([1,2,3,3,4],[3]) => [1, 2, 4] 1.filter() filter() 方法创建一个新的数组,新数组中的元素是通过检查指定数组中符合条件的所有元素. 注意: filter()

.map() .filter() .reduce() .includes() .some() .every()的用法

<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" con

wireshark filter manualpage

NAME wireshark-filter - Wireshark filter syntax and reference SYNOPSIS wireshark [other options] [ -R "filter expression" ] tshark [other options] [ -R "filter expression" ] DESCRIPTION Wireshark and TShark share a powerful filter engi

LDAP查询过滤语法（MS）

http://social.technet.microsoft.com/wiki/contents/articles/5392.active-directory-ldap-syntax-filters.aspx?Sort=MostUseful LDAP Clauses A filter specifies the conditions that must be met for a record to be included in the recordset (or collection) tha

Intent官方教程(5)在manifest中给组件添加<Intent-filter>

Receiving an Implicit Intent To advertise which implicit intents your app can receive, declare one or more intent filters for each of your app components with an <intent-filter> element in your manifest file. Each intent filter specifies the type of

[Redux] Extracting Presentational Components -- Footer, FilterLink

Code to be refactored: let nextTodoId = 0; class TodoApp extends Component { render() { const { todos, visibilityFilter } = this.props; const visibleTodos = getVisibleTodos( todos, visibilityFilter ); return ( <div> <input ref={node => { this.

JS数组去重的十种方法

一.前言: 我们在实际工作中,或者在面试找工作时,都会用到或者被问到一个问题,那就是"数组如何去重".是的,这个问题有很多种解决方案,看看下面的十种方式吧! 二.数组去重方式大汇总: Methods 1: 思路:定义一个新数组,并存放原数组的第一个元素,然后将元素组一一和新数组的元素对比,若不同则存放在新数组中. function unique(arr){ var res = [arr[0]]; for(var i=1; i<arr.length; i++){ var repea

vuejs实现本地数据的筛选分页

今天项目需要一份根据本地数据的筛选分页功能,好吧,本来以为很简单,网上搜了搜全是ajax获取的数据,这不符合要求啊,修改起来太费力气,还不如我自己去写,不多说直接上代码效果图: 项目需要:点击左侧进行数据筛选,实现自动分页,自动生成页数,点击自动跳转项目代码:js代码 var subList=new Vue({ el:'#main', data:{ // subcontentData为本地数据 subContents:subcontentData, // 页面需要展现的数据 yemianda

Active Directory: LDAP Syntax Filters

LDAP syntax filters can be used in many situations to query Active Directory. They can be used in VBScriptand PowerShell scripts. Many utilities, like adfind and dsquery *, accept LDAP filters. Many PowerShell Active Directory module cmdlets, like Ge

6、二、App Components(应用程序组件)：1、Intents and Intent Filters(意图和意图过滤器)

1.Intents and Intent Filters(意图和意图过滤器) 1.0.Intents and Intent Filters(意图和意图过滤器) An Intent is a messaging object you can use to request an action from another app component. Although intents facilitate communication between components in several ways,

SecureCRT也能和Xshell一样批量导入主机

在Xshell可以像这样一个文件批量导入主机: https://blog.netsarang.com/91/importing-csv-formatted-host-information-to-xshell/ 在CRT上也可以,格式和Xshell的一样,但前提是需要运行一个自定义脚本: 脚本:https://forums.vandyke.com/showthread.php?p=37089#post37089 操作:https://www.vandyke.com/support/tips/im

Intents and Intent Filters

An Intent is a messaging object you can use to request an action from another app component. Although intents facilitate communication between components in several ways, there are three fundamental use-cases: To start an activity: An Activity repres

js数组去重方法整理

1.思路:定义一个新数组,并存放原数组的第一个元素,然后将原数组的项和新数组的元素一一对比,若不同则存放在新数组中. function unique(arr){ var res = [arr[0]]; for(var i=1; i<arr.length; i++){ var repeat = false; for(var j=0; j<res.length; j++){ if(arr[i] === res[j]){ repeat = true; break; } } if(!repeat){

JS数组去重的十种方法（转载）

重点:博客原文出自http://www.cnblogs.com/yuanbo88/p/7345331.html.我只是想给自己做个笔记.感谢敲代码的怪蜀黍做的贡献. Methods 1: 思路:定义一个新数组,并存放原数组的第一个元素,然后将元素组一一和新数组的元素对比,若不同则存放在新数组中. function unique(arr){ var res = [arr[0]]; for(var i=1; i<arr.length; i++){ var repeat = false; for(va

es6数组的一些函数方法使用

数组函数forEach().map().filter().find().every().some().reduce()等数组函数(这里的回调函数中的index和arr都可以省略,回调函数后有参数是设置调整this指向的,这里暂时不使用) forEach() -----循环map()— —更新数组filter().includes().find().findIndex()— —筛选(删除)数组some().every()— —判断数组reduce()— —叠加数组 arr.forEach() 遍

Hive之执行计划分析(explain)

Hive是通过把sql转换成对应mapreduce程序,然后提交到Hadoop上执行,查看具体的执行计划可以通过执行explain sql知晓一条sql会被转化成由多个阶段组成的步骤,每个步骤有执行顺序和依赖关系,可以称之为有向无环图(DAG:Directed Acyclic Graph) 这些步骤可能包含:元数据的操作,文件系统的操作,map/reduce计算等语法格式: EXPLAIN [EXTENDED|DEPENDENCY|AUTHORIZATION|LOCKS|VECTORIZAT

JavaScript 实用技巧

1数组中删除重复 let arr = [1,2,4,3,6,4] Array.from(new Set(arr)) // es6中 .from()[1,2,4,3,6] [...new Set(arr)] // 扩展运算符[1,2,4,3,6] 2替换数组中指定的值 arr .splice(1,3,7,8,9) // [7, 8, 9] arr // [1, 7, 8, 9, 6, 4] 3数组映射 let mapValue = [ { name: '山东', value: 22 }, { na

JavaScript中数组去重汇总

1. 简单的去重方法,利用数组的indexOf下标属性来查询 /* * 新建一新数组,遍历传入数组,值不在新数组就push进该新数组中 * IE8以下不支持数组的indexOf方法 * */ function newArr(nArr) { var arr = []; for(var i = 0; i < nArr.length; i++){ if(arr.indexOf(nArr[i]) === -1){ arr.push(nArr[i]); } } return arr; } 2. 利用双层

js中数组遍历常用的方法

常见的数组遍历方法,比如 for in,for of, forEach,map,filter,every,some,find,reduce等 1,普通for循环,经常用的数组遍历 var arr = [1,2,0,3,9]; for ( var i = 0; i <arr.length; i++){ console.log(arr[i]); } 2,优化版for循环:使用变量,将长度缓存起来,避免重复获取长度,数组很大时优化效果明显 for(var j = 0,len = arr.length

Google DevTools Explanation

Evaluating network performance The Network panel records information about each network operation in your application, including detailed timing data, HTTP request and response headers, cookies, WebSocket data, and more. The Network panel helps you a

filter和includes

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