从红宝石数组，如果条件得到价值 [英] get values from ruby array if condition

问题描述

我映射这个code a数组：

I'm mapping a array with this code:

url = "http://www.cnn.com"
page = Mechanize.new.get(url)
images_url = page.images.map{|img| img.url.to_s if (img.width.to_i > 200)}

我得到这样的结果在控制台：

I get this result in console:

[nil, "http://i2.cdn.turner.com/cnn/dam/assets/110929092349-nelson-mandela-t1-main.jpg", nil, nil, nil, nil, nil, "http://i2.cdn.turner.com/cnn/dam/assets/120225123812-syria-mani-2-c1-main.jpg", nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, "http://i2.cdn.turner.com/cnn/dam/assets/120225022127-blue-fish-bin-tease.jpg", nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil]

我要得到这个数组没有的无的价值观，它的意思，我希望得到一个数组某物像：

I want get this array without nil values, its mean, I want get a array sth like:

["http://i2.cdn.turner.com/cnn/dam/assets/110929092349-nelson-mandela-t1-main.jpg", "http://i2.cdn.turner.com/cnn/dam/assets/120225123812-syria-mani-2-c1-main.jpg", "http://i2.cdn.turner.com/cnn/dam/assets/120225022127-blue-fish-bin-tease.jpg"]

对于这种情况，3的值。

感谢您

推荐答案

您可以致电阵列的紧凑方法，从它删除空的结果。

You can call the compact method on your Array to remove empty results from it.

images_url = page.images.map{|img| img.url.to_s if (img.width.to_i > 200)}.compact

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