From: Brian Candler <b.candler@...>
Date: 2011-11-02T05:01:08+09:00
Subject: Re: Working from a string to an array

Here's a version which doesn't split the string into parts:

>>    hash = {
?>       "bob"=> 42,
?>       "joe"=> 1,
?>       "tom"=> 16,
?>       "luc"=> 872,
?>       "mike"=> 32,
?>    }
=> {"mike"=>32, "joe"=>1, "luc"=>872, "tom"=>16, "bob"=>42}
>>    def transform(str, hash)
>>      str.gsub(/@(\w+)/) { hash[$1] }
>>    end
=> nil
>>    transform("Hello @bob!", hash)
=> "Hello 42!"

But it's not much harder to meet your original requirement:

>> def transform2(str, hash)
>>   str.split(/(@\w+)/).map { |x| x =~ /^@(.+)/ ? hash[$1] : x }
>> end
=> nil
>> transform2("Hello @bob!", hash)
=> ["Hello ", 42, "!"]

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