Create or append to array in Ruby

foo ||= []
foo << :element

Feels a little clunky. Is there a more idiomatic way?

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最佳答案

(foo ||= []) << :element

But meh. Is it really so onerous to keep it readable?

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You can always use the push method on any array too. I like it better.

(a ||= []).push(:element)

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You also could benefit from the Kernel#Array, like:

# foo = nil
foo = Array(foo).push(:element)
# => [:element]

which has the benefit of flattening a potential Array, like:

# foo = [1]
foo = Array(foo).push(:element)
# => [1, :element]

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Also a little more verbose for readability and without a condition:

foo = Array(foo) << :element