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Ruby `extend self` example
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| module A | |
| extend self | |
| def a | |
| puts 'a' | |
| end | |
| end | |
| A.a # => 'a' | |
| class IncludeA | |
| include A | |
| end | |
| IncludeA.new.a # => 'a' | |
| IncludeA.a # => undefined method `a' for IncludeA:Class (NoMethodError) | |
| class ExtendA | |
| extend A | |
| end | |
| ExtendA.new.a # => undefined method `a' for #<ExtendA:0x007fec4a92c500> (NoMethodError) | |
| ExtendA.a # => 'b' |
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