如何在JavaScript中进行关联数组/散列 [英] How to do associative array/hashing in JavaScript

问题描述

我想使用JavaScript计算/存储一些统计信息，C＃中的等效代码在下面（我需要的功能是 - 键值对，字符串/ int键值对，按键操作值等），任何想法如何在JavaScript中实现相同的功能？看来没有内置的Dictionary或Hashtable？

 字典< string，int>统计; 
 
 statistics [Foo] = 10; 
 statistics [Goo] = statistics [Goo] + 1; 
 statistics.Add（Zoo，1）; 
  

解决方案

使用。

关联数组：简单的单词关联数组使用字符串而不是整型数字作为索引。

创建一个对象与

  var dictionary = {}; 
  

Javascript允许您通过使用以下语法向对象添加属性：

  Object.yourProperty = value; 
  

另一种语法是：

  Object [yourProperty] = value; 
  

如果您还可以使用以下语法创建键值来对象映射

  var point = {x：3，y：2} 
 
 point [x] // => 3; 
 point.y // => 2; 
  

您可以使用for..in循环遍历关联数组构造如下

  for（key in dict）{
 var value = dict [键]; 
 / *使用键/值用于预期目的* / 
} 
  

I want to calculate/store some statistics information using JavaScript, the equivalent code in C# is below (features I need are -- key-value pair, string/int key value pair, manipulate values by keys, etc.), any ideas how to implement the same function in JavaScript? Looks like there is no built-in Dictionary or Hashtable?

Dictionary<string, int> statistics;

statistics["Foo"] = 10;
statistics["Goo"] = statistics["Goo"] + 1;
statistics.Add("Zoo", 1);

解决方案

Use JavaScript objects as associative arrays.

Associative Array: In simple words associative arrays use Strings instead of Integer numbers as index.

Create an object with

var dictionary = {};

Javascript allows you to add properties to objects by using the following syntax:

Object.yourProperty = value;

An alternate syntax for the same is:

Object["yourProperty"] = value;

If you can also create key to value object maps with the following syntax

var point = { x:3, y:2 };

point["x"] // => 3;
point.y // => 2;

You can iterate through an associative array using the for..in loop construct as follows

for(key in dict){
  var value = dict[key];
  /* use key/value for intended purpose */
}

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