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asiniy/hash_fetch.rb

Created July 4, 2018 07:10
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Rubyish Hash#Fetch # Extending JavaScript with ease (beginner level tutorial)
Raw
hash_fetch.rb
o = { a: 'b' }
o.fetch(:a) # => returns 'b'
o.fetch(:nonexistant) # => throws prog.rb:2:in `fetch': key not found (KeyError)
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