Checking Credit Cards (#122)
in [Ruby]
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From: Ryan Leavengood on 3 May 2007 10:25 On 5/3/07, Rick DeNatale <rick.denatale(a)gmail.com> wrote: > > After seeing the neat use of each_slice instead of each_with_index > > def luhn(string) > string.scan(/./).reverse.enum_for(:each_slice, 2).inject(0) do |sum, (d1, d2)| > sum += d1.to_i + (d2||'0').tr('0123456789', '0246813579').to_i > end % 10 == 0 > end > > No need to define any extra Enumerator methods. Nice, I like it. When I first thought about using enum_for(:each_slice, 2) I was surprised that it even worked. Enumerator is a powerful library. It seems like I learn something new every time I do one of these quizzes, either from making my own solution or reading someone else's. Ryan
From: James Edward Gray II on 3 May 2007 10:29 On May 3, 2007, at 9:15 AM, anansi wrote: >> Ruby Quiz will now take a one week break. Work has been rough >> this week and I >> need some down time. I'll be back next week, rested, and with new >> quizzes... > > > Means that: no quiz tomorrow ?!? Yes. I need a short break. We will have one the following Friday though. James Edward Gray II
From: Rick DeNatale on 3 May 2007 10:33 On 5/3/07, Ryan Leavengood <leavengood(a)gmail.com> wrote: > Enumerator is a powerful library. Yep. And personally, I like the fact that Ruby 1.9 is on the path to: 1) Move enumerator to the core classes. 2) Have enumerator methods return an enumerator if they are called without a block. The second one seems to be slightly controversial, but I love it. -- Rick DeNatale My blog on Ruby http://talklikeaduck.denhaven2.com/
From: anansi on 3 May 2007 10:34 James Edward Gray II wrote: > On May 3, 2007, at 9:15 AM, anansi wrote: > >>> Ruby Quiz will now take a one week break. Work has been rough this >>> week and I >>> need some down time. I'll be back next week, rested, and with new >>> quizzes... >> >> >> Means that: no quiz tomorrow ?!? > > Yes. I need a short break. We will have one the following Friday though. > > James Edward Gray II > Maybe someone is interested or has an idea for an unoffical Ruby Quiz for this week. I'm bored , so If someone has any idea, feel free to drop it ;) -- greets ( ) ( /\ .-"""-. /\ //\\/ ,,, \//\\ |/\| ,;;;;;, |/\| //\\\;-"""-;///\\ // \/ . \/ \\ (| ,-_| \ | / |_-, |) //`__\.-.-./__`\\ // /.-(() ())-.\ \\ (\ |) '---' (| /) ` (| |) ` jgs \) (/ one must still have chaos in oneself to be able to give birth to a dancing star
From: Puria Nafisi Azizi on 3 May 2007 11:04
anansi wrote: > Maybe someone is interested or has an idea for an unoffical Ruby Quiz > for this week. I'm bored , so If someone has any idea, feel free to drop conway's game of life? |