From: Thomas Chust <chust@...>
Date: 2009-08-08T03:27:53+09:00
Subject: Re: How do I add ?

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
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.