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Ruby | Find keys common to multiple hashes
keys and & .
Example 1
Next, if both has b: and c: keys.
{ a: nil, b: nil, c: nil }.keys & { b: nil, c: nil, d: nil }.keys # => [:b, :c]
Example 2
It can also be used for three or more hashes.
Next, if every hash has a key of c: .
{ a: nil, b: nil, c: nil }.keys & { b: nil, c: nil, d: nil }.keys & { c: nil, d: nil, e: nil}.keys # => [:c]
environment
- ruby 2.3.0
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公開日時
2019-04-16
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