检查如果一个数组中的CoffeeScript一些项目 [英] Checking if an array has some items in coffeescript

问题描述

有没有一些CoffeeScript的方法时，阵列中有一些项目，则返回true？像红宝石 present 方法：

Is there some method in coffeescript that returns true when an array has some items in it? Like method in ruby present?:

[].present? false
[1].present? true

据<一个href=\"http://arcturo.github.com/library/coffeescript/07_the_bad_parts.html\">http://arcturo.github.com/library/coffeescript/07_the_bad_parts.html在CoffeeScript中数组空虚是由它的长度来确定

According to http://arcturo.github.com/library/coffeescript/07_the_bad_parts.html an array emptiness in coffeescript is determined by its length

alert("Empty Array")  unless [].length

这似乎很蹩脚我。

推荐答案

我不觉得有什么，但可以是：

I don't think there is but can be:

Array::present = ->
  @.length > 0

if [42].present()
  # why yes of course
else
  # oh noes

有一个非常简单的和不完整的实现，但它应该给你一些想法。并记录在案，没有 present？方法在Ruby中，该方法是由 active_support 宝石加

A very simple and incomplete implementation but it should give you some ideas. And for the record, there's no present? method in Ruby, the method is added by the active_support gem.

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