和谐集合的用户定义对象相等性 (es6) [英] user defined object equality for a set in harmony (es6)

问题描述

我有一个问题，我生成了许多值，需要确保我只使用唯一的值.由于我使用的是带有 --harmony 标志的节点 js，并且可以访问和声集合，因此我决定 Set 可能是一个选项.

I have a problem where I'm generating many values and need to make sure I only work with unique ones. Since I'm using node js, with the --harmony flag, and have access to harmony collections, I decided that a Set may be an option.

我正在寻找类似于以下示例的内容:

What I'm looking for is something similar to the following example:

'use strict';

function Piece(x,y){
  this.x = x  
  this.y = y
}

function Board(width,height,pieces){
 this.width = width 
 this.height = height
 this.pieces = pieces
}

function generatePieces(){
 return [
  new Piece(0,0),
  new Piece(1,1) 
 ] 
}

//boardA and boardB are two different but equivalent boards
var boardA = new Board(10,10,generatePieces()) 
var boardB = new Board(10,10,generatePieces())

var boards = new Set()
boards.add(boardA)
boards.has(boardB) //return true

现在通常要在另一种语言中实现这一点，比如 c#，我希望必须实现一个 equals 函数，以及一个用于 Board 和 Piece 的哈希代码生成函数.因为我希望默认对象相等性基于引用.或者可能使用特殊的不可变值类型(例如，Scala 中的 case 类)

Now normally to achieve this in another language, say c#, I would expect to have to implement an equals function, as well as a hash code generating function for both Board and Piece. Since I'd expect the default object equality to be based on references. Or perhaps use a special immutable value type (say, a case class in scala)

有没有办法为我的对象定义相等性来解决我的问题?

Is there a means to define equality for my objects to solve my problem?

推荐答案

有没有办法为我的对象定义相等性来解决我的问题?

Is there a means to define equality for my objects to solve my problem?

不，不是.在邮件列表中已经对此进行了一些讨论.结果是:

No not really. There has been some discussion about this on the mailing list. The result is:

• 在 Set/Map 之上构建您自己的 Set/Map 抽象，这将根据您的散列函数将对象转换为原始值.
• 等待 ES7 中的值对象.

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