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我阵列中的空元素检查——Rub
原标题:Checking for empty elements within my array - Ruby
  • 时间:2012-05-10 10:40:46
  •  标签:
  • ruby

我的阵列中有一个内容,即当我勾画出这一具体要素的价值时,我就有一个空洞的价值。

puts my_listing[2].inspect
[]

当我检查一下该具体内容是否空洞时,使用<条码>豁免?

puts my_listing[2].empty?
true

但是,如果我通过整个阵列进行核对,看看<代码>i是空的,那么就没有发现这一特殊因素。

my_listing.each do |i|
    if i.empty?
        puts i
    end
end

(此处为2) 从未印制到屏幕上。

为什么如此?

基本上,我试图排除空阵列中的所有内容(在这种情况下,是指数<2>>>的元件),但我不敢肯定这些内容如何得到。

我失踪了什么?

感谢。

最佳回答

奥赫里特人

       my_listing.each_with_index do |i,index|
          if i.blank?
             puts index.inspect
          end
       end

它为你提供了空洞或无能的阵列指数。

问题回答

You re not seeing anything printed because you forgot to use #inspect You could also just have written:

my_listing.each do |i|
    i.empty? and p i
end

为了消除空洞元素,你可以做以下工作:

my_array = [[1],[2],[],[4]]

p my_array.reject(&:empty?) # => [[1], [2], [4]]

拒绝呼吁? 删除所有内容的空洞内容





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