From: Arup Rakshit <lists@...>
Date: 2013-02-03T07:12:44+09:00
Subject: Re: Why none of the block giving the expected output with the "enumerator"?

unknown wrote in post #1094928:
> Am 02.02.2013 21:20, schrieb Arup Rakshit:

> What you probably misinterpreted as the output (the part after '=>')
> is actually the value of the evaluated expresssion, which in this case
> is the return value of the each method (-> the array itself, see docs).
> Besides the output generated by puts statements etc., irb always
> additionally outputs the value of the evaluated expression.
>
>> irb(main):021:0> a.each{|x,y| x-y }
>> TypeError: nil can't be coerced into Fixnum
>>          from (irb):21:in `-'
>>          from (irb):21:in `block in irb_binding'
>>          from (irb):21:in `each'
>>          from (irb):21:in `each'
>>          from (irb):21
>>          from C:/Ruby193/bin/irb:12:in `<main>'
>
> This cannot work, because #each yields exactly one parameter (see docs).
> y therefore always is nil and nil cannot be subtracted from x.

`+1` to you. You guided me perfectly! :)

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