Home > Web Front-end > JS Tutorial > body text

Comparison of map, set, array, and object in ES6 (detailed tutorial)

亚连
Release: 2018-06-02 14:53:02
Original
1991 people have browsed it

This article mainly introduces you to the relevant information about the comparison of map, set, array, and object in ES6 study notes. The article introduces it in detail through example code, which has certain reference learning value for everyone's study or work. Friends who need it, please study together below.

Preface

The data structures in ES5 mainly use Array and Object. In ES6, the Set and Map data structures are mainly added. So far, there are four commonly used data structures: Array, Object, Set, and Map. Not much to say below, let’s take a look at the detailed introduction.

// Horizontal comparison of data structure, add, check, modify, delete

1. Comparison of map and array

{ 
 let map=new Map();
 let array=[];

 /**增**/
 map.set('t',1);
 array.push({t:1});
 console.info('map-array',map,array); 

 /**查**/
 let map_exist=map.has('t');
 let array_exist=array.find(item=>item.t);
 console.info('map-array',map_exist,array_exist); 

 /**改**/
 map.set('t',2);
 array.forEach(item=>item.t?item.t=2:'');
 console.info('map-array-modify',map,array); 

 /**删**/
 map.delete('t');
 let index=array.findIndex(item=>item.t);
 array.splice(index,1);
 console.info('map-array-empty',map,array);
}
Copy after login

2. Comparison between set and array

##

{
 let set=new Set();
 let array=[]; 
 
 // 增
 set.add({t:1});
 array.push({t:1});
 console.info('set-array',set,array);

 // 查
 let set_exist=set.has({t:1});
 let array_exist=array.find(item=>item.t);
 console.info('set-array',set_exist,array_exist); 

 // 改
 set.forEach(item=>item.t?item.t=2:'');
 array.forEach(item=>item.t?item.t=2:'');
 console.info('set-array-modify',set,array); 
 
 // 删
 set.forEach(item=>item.t?set.delete(item):'');
 let index=array.findIndex(item=>item.t);
 array.splice(index,1);
 console.info('set-array-empty',set,array);
}
Copy after login

3. Comparison of map, set and Object

##
{ 
 let item={t:1};
 let map=new Map();
 let set=new Set();
 let obj={}; 

 // 增
 map.set('t',1);
 set.add(item);
 obj['t']=1;
 console.info('map-set-obj',obj,map,set); 

 // 查 
 console.info({
 map_exist:map.has('t'),
 set_exist:set.has(item),
 obj_exist:'t' in obj
 }) 

 // 改
 map.set('t',2);
 item.t=2;
 obj['t']=2;
 console.info('map-set-obj-modify',obj,map,set); 

 // 删除
 map.delete('t');
 set.delete(item); 
 delete obj['t'];
 console.info('map-set-obj-empty',obj,map,set);
}
Copy after login

Through comparison, it can be found that those who can use map should be used first instead of arrays.


Considering the uniqueness of data, consider using set instead of using Objet

It can be used in future development Prioritize the use of map and set, and you can give up arrays and objects

The above is what I compiled for everyone, I hope it will be helpful to everyone in the future.

Related articles:

Detailed explanation of vue’s mixins attribute

Vue uses mixins to implement compressed image code


vue2.0 simulated anchor point example



# #

The above is the detailed content of Comparison of map, set, array, and object in ES6 (detailed tutorial). For more information, please follow other related articles on the PHP Chinese website!

Related labels:
source:php.cn
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Popular Tutorials
More>
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template
About us Disclaimer Sitemap
php.cn:Public welfare online PHP training,Help PHP learners grow quickly!