From: Phrogz <phrogz@...>
Date: 2009-10-31T07:35:04+09:00
Subject: Re: How do you get the tail end of a string?

On Oct 30, 10:40 am, Bertram Scharpf <li...@bertram-scharpf.de> wrote:
>   irb(main):001:0> def timer ; start = Time.now ; yield ; Time.now - start ; end
>   => nil
>   irb(main):002:0> index = 2
>   => 2
>   irb(main):003:0> timer do 100_000.times { "hello"[-index..-1] } end
>   => 0.888826
>   irb(main):004:0> timer do 100_000.times { "hello".tail index } end
>   => 0.21357
>
> Your calculation needs more than four times as much processor
> time. Don't you need to save time?

Really? You're arguing about the efficiency of something that is about
6.8µs slower?
I don't personally need to save the time. Nor do you, unless you have
a real-world program using this method that you have benchmarked and
found this particular method call to be a significant portion of your
execution time.