如果不为 nil 且不为空，则合并数组

问题描述

Ruby 中有一些数组(这种情况下有 4 个数组)

There are some arrays in Ruby (is this case there 4 array)

array1 = [{key="label1.1", value="label1.2"}, {key="label1.2", value="label1.2"}]
array2 = [{key="label2.1", value="label2.2"}]

array3 = []
array4 = nil
result_array = array1 | array2 | array3 | array4

每个数组都具有与其他数组相同的结构:它是哈希值.其中有多少元素，如果它是零或空的 - 不知道.

Each of arrays has the same structure as others: it's hash values. How many elements in it, if it's nil or empty - it's not known.

所以我需要 result_array 来查看:

So I need result_array to look:

[{key="label1.1", value="label1.2"}, {key="label1.2", value="label1.2"}, {key="label2.1"", value="label2.2"}]

然而，该代码将导致异常，因为 array4 等于 nil.

However that code is going to cause an exception because array4 is equal to nil.

Ruby 有没有办法检查数组是否为 nil 且不为空，如果是，则将其合并到 result_array?

Is there any, Ruby, way to check if an array is not nil and not empty and if so, then merge it to result_array?

推荐答案

[array1, array2, array3, array4].compact.reduce([], :|)

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