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| Maybe([1,2,3]).select {|e| e < 3} # Just([1, 2]) | |
| Maybe([1,2,3]).select {|e| e < 0} # Nothing | |
| Maybe([1,2,3]).select {|e| e < 3} # Just([1, 2]) | |
| Either(Maybe([1,2,3]).select {|e| e < 3}) # Success([1, 2]) | |
| Either(Maybe([1,2,3]).select {|e| e < 0}) # Failure(Nothing) |
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