将命名函数的列表传递给coffeescript的函数 [英] Pass a list of named functions into function in coffeescript

问题描述

在API文档中有一段代码：

  casper.waitFor（function check（）{
 return this.evaluate（function（）{
 return document.querySelectorAll（'ul.your-list li'）。length> 2; 
}）; 
 this.captureSelector（'yoursitelist.png'，'ul.your-list'）; 
}，function timeout（）{
 this.echo（I can not haz 。）。exit（）; 
}）; 
  

我需要这个，但是在coffeescript项目中。我试图重写它到coffeescript，但它没有工作。即使我让

CoffeeScript中的函数声明

这个特定的例子不需要他们，看起来像他们只是为了文档目的，写：

  check =  - > @evaluate（ - > document.querySelectorAll（'ul.your-list li'）。length> 2）
 and_then =  - > @captureSelector（'yoursitelist.png'，'ul.your-list'）
 timeout =  - > @echo（I can not haz my screenshot。）exit（）
 casper.waitFor（check，and_then，timeout）
  

在CoffeeScript中获得相同的效果。

In the API Documentation there is a snippet:

casper.waitFor(function check() {
    return this.evaluate(function() {
        return document.querySelectorAll('ul.your-list li').length > 2;
    });
}, function then() {
    this.captureSelector('yoursitelist.png', 'ul.your-list');
}, function timeout() {
    this.echo("I can't haz my screenshot.").exit();
});

I need this, but in a coffeescript project. I tried to rewrite it into coffeescript but it didn’t work. Even if i let js2coffe do the job, i get some invalid coffeescript from valid javascript:

i dont know how to pass a list of named functions into another function correctly.

解决方案

CoffeeScript doesn't really support named functions like that, see:

• How do I create a named function expressions in CoffeeScript?
• Function declaration in CoffeeScript

That specific example doesn't need them anyway, it looks like they're just there for documentation purposes so you could write:

check    = -> @evaluate(-> document.querySelectorAll('ul.your-list li').length > 2)
and_then = -> @captureSelector('yoursitelist.png', 'ul.your-list')
timeout  = -> @echo("I can't haz my screenshot.").exit()
casper.waitFor(check, and_then, timeout)

in CoffeeScript to get the same effect.

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