将CoffeeScript问号语法翻译成Javascript

I have a CoffeeScript snippet that uses the Question mark operator. I need to translate into Javascript syntax. The snippet is like the following.

我有一个使用问号运算符的CoffeeScript代码段。我需要翻译成Javascript语法。该片段如下所示。

closeItem: (item) ->
    item.close() if item?.close and not item.isClosed

I tried to run into CoffeeScript site and the result is the following.

我试图遇到CoffeeScript网站，结果如下。

({
  closeItem: function(item) {
    if ((item != null ? item.close : void 0) && !item.isClosed) {
      return item.close();
    }
  }
});

Is this correct? Based on my knowledge (I'm new both on Javascript and CoffeeScript) I would translate as

它是否正确？根据我的知识（我是Javascript和CoffeeScript的新手）我会翻译为

closeItem: function(item) {
    if(item && item.close && !item.isClosed) item.close();
}

Am I missing something?

我错过了什么吗？

1 个解决方案

#1

Your translation is good, although you might want to return the return value of item.close() (as that's what the CoffeeScript version does). CoffeeScript's translation is probably more general-purpose (for instance, it would handle a?.foo if a were the number 0). If you know item is an object, your version is fine.

你的翻译很好，虽然你可能想要返回item.close（）的返回值（就像CoffeeScript版本那样）。 CoffeeScript的翻译可能更通用（例如，如果数字为0，它将处理？.foo）。如果您知道item是一个对象，那么您的版本就可以了。