如何在节点/ iojs中使用ES6计算属性名？ [英] How to use ES6 computed property names in node / iojs?

问题描述

我正在尝试编写一个CSV文件并根据标题行动态生成定义的工具。例如，CSV： >

 标题（STRING），说明（TEXT）
标题示例，说明示例
 ... 
  

Sequelize docs 指定，例如：

  var Entry = sequelize。 define（'Entry'，{
 title：Sequelize.STRING，
 description：Sequelize.TEXT 
}）
  

我如何写这个定义，以便它可以被动态定义 - 以便 title 和数据类型 Sequelize.STRING 可以根据CSV标题行动态生成？

---

编辑

好的，经过一些研究，我认为明显的问题是如何使用变量名称作为动态

因此，以括号表示法写入这一点很简单：

  var definitionObj = {} 
 definitionObj ['title'] = sequelize.STRING; 
 definitionObj ['description'] = sequelize.TEXT; 
 
 var Entry = sequelize.define（'Entry'，definitionObj）; 
  

然而，我的问题现在是如何使用ES6 节点中的计算属性名称？我正在使用我认为有ES6支持的节点0.12.2，甚至使用 - 和谐标志，这个简单的代码失败：

  var Entry = sequelize.define（'Entry'，{
 ['title']：Sequelize.STRING，
 ['description' ]：Sequelize.TEXT 
}）; 
  

with SyntaxError：Unexpected token [

唯一的选择是真正的 io.js 吗？ / p>

编辑2

实际上，即使使用iojs，这种语法仍然失败，所以我必须做错了什么？

解决方案

ECMAScript 6兼容性表显示了节点和io.js目前都不支持计算属性。数据位于对象文字扩展名> 计算属性。

I am trying to write a tool that takes a CSV and dynamically generates a definition based on the header row?

For example, a CSV with:

Title(STRING), Description(TEXT)
Title Example, Description Example
...

the Sequelize docs specify, for example:

var Entry = sequelize.define('Entry', {
  title: Sequelize.STRING,
  description: Sequelize.TEXT
})

How could I write this definition so that it could be dynamically defined - so that title and the data type Sequelize.STRING could be dynamically generated based on the CSV header row?

---

EDIT

Ok, after some research, I think the obvious question is "How to use variable names as dynamic key names in object literal" and has been answered several times.

As a result, it is simple to write this in bracket notation so:

var definitionObj = {}
definitionObj['title'] = sequelize.STRING;
definitionObj['description'] = sequelize.TEXT;

var Entry = sequelize.define('Entry', definitionObj);

However, then my question now is how do I use ES6 Computed Property Names in node? I'm using node 0.12.2 which I thought had ES6 support, and even with the --harmony flag, this simple code fails:

var Entry = sequelize.define('Entry', {
  ['title']: Sequelize.STRING,
  ['description']: Sequelize.TEXT
});

with SyntaxError: Unexpected token [

Is the only option really to go to with io.js?

EDIT 2

Actually this syntax still fails even with iojs, so I must be doing something wrong?

解决方案

The ECMAScript 6 compatibility table shows that neither Node nor io.js currently have support for computed properties. The data is under object literal extensions > computed properties.

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