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What is the difference between <%, <%=, <%# and -%> in ERB in Rails?

templatesruby-on-railsrubyerb
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What does map(&:name) mean in Ruby?

parameter-passingoperatorssyntaxruby
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Strange, unexpected behavior (disappearing/changing values) when using Hash default value, e.g. Hash.new([])

hashruby
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Is Ruby pass by reference or by value?

pass-by-referenceruby-on-railsruby
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What is attr_accessor in Ruby?

ruby
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