From: Rob Biedenharn <Rob@...>
Date: 2009-08-08T04:47:48+09:00
Subject: Re: How do I add ?


On Aug 7, 2009, at 2:27 PM, Thomas Chust wrote:

> 2009/8/7 Rob Biedenharn <Rob@agileconsultingllc.com>:
>> [...]
>> puts File.readlines('some_file.txt').inject(0) {|total,line| total +
>> line.split("\t")[1].to_i }
>>
>> (but if the file is large, that could be terribly inefficient)
>> [...]
>
> Hello,
>
> inject is a method of Iterable, so it's unnecessary to read the whole

I think you meant Enumerable

> file into memory first to use it. I would prefer a solution that is
> both elegant and efficient:
>
>  puts file.inject(0) {|acc, line| acc + line.split(/\t/)[1].to_f }
>
> cu,
> Thomas
>
> --  
> When C++ is your hammer, every problem looks like your thumb.

Maybe "Iterable" is something from C++? ;-)

I guess I could have simply replaced .readlines with .open in my one- 
liner.

-Rob

Rob Biedenharn		http://agileconsultingllc.com
Rob@AgileConsultingLLC.com