Ruby 2.2.0-preview1 Released

https://www.ruby-lang.org/en/news/2014/09/18/ruby-2.2.0-preview1-released/

by petercooper • 12 years ago

163 33 12 years ago

ruby-lang.org

stanislavb• 12 years ago

Waiting for Christmas...

atmosx• 12 years ago

Because if this Rails 5.0 will be released for Ruby [...]

I guess there's a typo: s/if/of

riffraff2• 12 years ago

My fav feature:

   * min, min_by, max and max_by supports optional argument to return multiple elements.

Assuming this does The Right Thing (i.e. uses fixed space) I always wanted it.

repsilat• 12 years ago

uses fixed space

I guess the "normal" way to write this is with a heap? For `min`, I guess the algorithm is something like,

  min(items, k=1):
    h = max_heap(items[:k])
    for i in items[k:]:
      h.push(i)
      h.pop_max()
    return sorted(h)

It isn't asymptotically slower than the normal algorithm for k=1, it doesn't need to make multiple passes over the data, and it doesn't mutate the original data structure, so it's a pretty sensible and natural extension to put in.

riffraff2• 12 years ago

yes, it's not hard (although I seem to recall mysql only implemented "limit" like this in v5.6), it's just that if it's not readily available people (well, me) tend to fall back to sort+first(n), which can be quite wasteful.

tbrock• 12 years ago

Ruby is still my favorite programming language to use for a project. It doesn't have the immediate approachability of python but if you put in the effort to understand and accept it's quirkiness you fall in love. I hope it continues to move forward as far as performance goes so people will continue to use it, not just mostly for prototypes, but beyond. Ruby 2.2 is a great step.

thibaut_barrere• 12 years ago

I started using Ruby 10 years ago and I'm surprised by its longevity as my main language. It's quite far from falling down gradually. I'm glad I picked it for my most important projects: it really feels as a solid base to build upon.

yxhuvud• 12 years ago

What quirkiness are you referring to? I tend to find python more quirky but then I've got a lot more experience with Ruby.

muchabi• 12 years ago

Also curious here. I too find Ruby more consistent/predictable than Python.

Ruby is my main/favorite language, but I was exposed to Python first and used it a lot more for work/school, so it's not an experience thing here.

Slackwise• 12 years ago

understand and accept it's quirkiness

Ruby is the child of Smalltalk and Perl/shell.

If you know said languages, then you can figure out Ruby much easier.

ramigb2• 12 years ago

It's a "weird feeling" to see a framework mentioned in a language update! it shows you that like Python has "one obvious way to do things" Ruby has one obvious framework, i can't see PHP 6.0 released and codeigniter/cake/any other framework mentioned in the release, correct me i'm wrong!.

why-el2• 12 years ago

It really isn't. They mentioned Rails because it will be the biggest winner from their new GC that also collects symbols (Rails is a heavy user of symbols). No harm in mentioning some of the beneficiaries of the change, as long as that change is not unfairly impacting other projects. Good move from Matz and co.

ramigb2• 12 years ago

Never said it's a bad move, i love Rails and i love Ruby as well, it was just the first time i see a framework directly mentioned in a language changelog.

why-el2• 12 years ago

Very impressive results with the new GC for symbols. Of 100,000 created, a `GC.start` got them down to about 2000.

stevekl• 12 years ago

I always have a mixed feeling about ruby. The "magic-ism" of ruby is something that I just cannot deal with.

"require" gives you methods that appear out of nowhere (unlike other language where they are name spaced), method call without perens (so what is an attribute, what is a method call)

All of these look nice at first but kills maintainability later

rubiquity2• 12 years ago

method call without perens (so what is an attribute, what is a method call)

That's known as Uniform Access Principle[0] and is a wonderful feature to have.

Ruby is far less magical today than it was 5-10 years ago. Magic is a clever word for "I don't understand this thing yet."

0 - http://martinfowler.com/bliki/UniformAccessPrinciple.html

innguest• 12 years ago

Disregarding the UAP thing you mentioned, I believe you might be dismissing the complaints of "magic" in Ruby too quickly if you think all it is meant by it is what you said.

In the contexts I usually see, the complaints of magic are regarding Ruby's fondness of Spooky Action at a Distance. I would then argue that Ruby or its frameworks do seem to rely too much on this "magic" that otherwise is condemned by recent literature (and Code Complete).

thescrewdriver• 12 years ago

gphil• 12 years ago

"require" gives you methods that appear out of nowhere (unlike other language where they are name spaced)

I always worry about this too, but in practice I've rarely run into a namespace collision (I can't even remember the last time it happened.)

regularfry2• 12 years ago

so what is an attribute, what is a method call

It's all method calls. Attributes don't really exist.

xentronium• 12 years ago

Well, they sort of do, in the form of instance variables.

epidemian2• 12 years ago

It's all method calls.

Probably nitpicking, but it's actually all messages. An object might not have a method "foo", but happily respond to the "foo" message.

dasil0032• 12 years ago

I believe he meant local variables (or if he didn't he should have).

ksec• 12 years ago

Now benchmarks Benchmarks...

dakull• 12 years ago

This looks awesome so far - kudos to the team. I also started benchmarking it just for fun[0]

[0] http://marianposaceanu.com/articles/ruby-2-2-0-preview-1-qui...

Ruby 2.2.0-preview1 Released

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