class Hash
Public Instance Methods
hash_revert()
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# File lib/sugar-high/hash.rb, line 13 def hash_revert r = Hash.new {|h,k| h[k] = []} each {|k,v| r[v] << k} r end
rewrite(mapping)
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www.dweebd.com/ruby/hash-key-rewrite/
# File lib/sugar-high/hash.rb, line 6 def rewrite mapping inject({}) do |rewritten_hash, (original_key, value)| rewritten_hash[mapping.fetch(original_key, original_key)] = value rewritten_hash end end
try_keys(*keys)
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# File lib/sugar-high/hash.rb, line 19 def try_keys *keys option = last_option keys keys.flatten.each do |key| return self[key] if self[key] end return option[:default] if option[:default] nil end