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List:       ruby-core
Subject:    Behaviour of Enumerables reject vs. select mixed into Hash
From:       Alexander Presber <aljoscha () weisshuhn ! de>
Date:       2007-06-19 11:01:57
Message-ID: A6481524-49FD-4A88-9DF6-E07072812917 () weisshuhn ! de
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Hello everybody,

Could you please take a look at the result of the following statements:

irb(main):001:0> a = {'foo' => 'bar', 'baz' => 'qux'}
=> {"baz"=>"qux", "foo"=>"bar"}

irb(main):002:0> a.reject{|k,v| k=='foo' }
=> {"baz"=>"qux"}

irb(main):003:0> a.select{|k,v| k=='baz' }
=> [["baz", "qux"]]

The result of the reject statement is clearly sensible: the original  
hash minus the element with the key 'foo'.
But what about select? Shouldn't it return the same hash (instead of  
an array of key-value pairs)?

Sincerely yours
Alexander Presber

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