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December 18, 2015 11:39
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ActiveSupport::HashWithIndifferentAccess and initialization block
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| h = ActiveSupport::HashWithIndifferentAccess.new {|h,k| h[k] = [] } | |
| # => {} | |
| h[:key1] | |
| # => [] | |
| h[:key1] << 13 | |
| # => [13] | |
| h | |
| # => {"key1"=>[13]} | |
| h[:key2] << 31 | |
| # => [31] | |
| h | |
| # => {"key1"=>[13], "key2"=>[]} | |
| h2 = Hash.new {|h, k| h[k] = [] } | |
| # => {} | |
| h2[:key] << 13 | |
| # => [13] | |
| h2 | |
| # => {:key=>[13]} |
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