Created
March 2, 2012 01:29
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ruby hash dig
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| class Hash | |
| def dig(*path) | |
| path.inject(self) do |location, key| | |
| location.is_a?(Hash) ? location[key] : nil | |
| end | |
| end | |
| end |
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| 1.9.3p0 :001 > h = {:foo => {:bar => {:baz => {:qux => true}}}} | |
| => {:foo=>{:bar=>{:baz=>{:qux=>true}}}} | |
| 1.9.3p0 :002 > h.dig(:foo, :bar, :baz, :qux) | |
| => true | |
| 1.9.3p0 :003 > h.dig(:foo, :bar, :baz, :qux, :barf) | |
| => nil | |
| 1.9.3p0 :004 > h.dig(:foo, :bar) | |
| => {:baz=>{:qux=>true}} | |
| 1.9.3p0 :005 > h.dig(:foo, :bar, :flapjacks) | |
| => nil |
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http://stackoverflow.com/questions/1820451/ruby-style-how-to-check-whether-a-nested-hash-element-exists