Please see the release notes for the full details. Imagine you are being interviewed for a job and the interviewer has just asked you to implement Fizz Buzz in any language you like. You admit that Fizz Buzz was not covered in your undergraduate algorithms class and that you have no idea what it is. Please implement it and show that it works on the numbers 1 through So, you choose a hybrid approach using ShenRuby. So, you add a divides? Now that you have divides? Finally, you write a bit of Ruby to print out the first twenty results, taking advantage of the fact that Shen functions are invokable as methods on the Shen object:.
Don't Overthink FizzBuzz
Intrigued, the interviewer spends the rest of the time asking questions about Shen. You get the job. The next interoperablilty feature that I plan to work on is the ability for Shen code to instantiate and interaction with native Ruby objects. These are still the early days of the interoperablilty story in ShenRuby. I expect the APIs to evolve as they get more mileage. Feedback, suggestions, and bug reports are appreciated. I discovered Shen —a functional programming language created by Mark Tarver—a few months ago while reading a blog post by Michael Fogus, author of The Joy of Clojure.
As I read more about it, I was smitten. A modern, functional Lisp with pattern matching, currying, and an optional, very powerful static type system? Sign me up! Something I found intriguing about Shen was that it was specifically designed for portability. It is implemented in a language called K Lambda, which is a tiny Lisp consisting of only 46 functions.
Port K Lambda and you have ported Shen. Tasks well suited to OOP or imperative programming could be written in Ruby. The two parts could then run together on a Ruby VM. Inspired, and with a copy of The Book of Shen in hand, I got to work. Today I am pleased to announce ShenRuby 0. The goal of the 0. The number shown increase with each expression evaluated. As ShenRuby matures towards its 1. This wins it many proponents and is a major contributor to the popularity of Node. Unfortunately, asynchronous programs can be challenging to write, read, and maintain.
Callback placeholders, indicated by In addition to telling the TBC macros that a given form requires a callback, the They expect a value or an expression returning a value as their first argument, a callback form to invoke with the final result as their last argument, and any number of intermediate forms in between. The intermediate forms may be synchronous function invocations, asynchronous function invocations having a callback placeholder as their final argument, or a combination of the two. The return value of TBC threading macros is always nil. It is expected that the final form will be a callback that will do something useful with the result passed to it.
Once the asynchronous result of async-square has been supplied to its automatically-generated callback, processing resumes with a synchronous call to str and then to println which serves as the final callback and displays the result.
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It allows the results of multiple asynchronous functions, executed in parallel, to be bound to variables that can be referenced the body expression. Its use is encouraged, however, for error handling purposes. Once error handling support has been incorporated into TBC see Status and Next Steps, below any errors that occur in the chain will be properly handled and propagated. It is expected to invoke a callback with its result. To see To Be Continued in action, please check out tbc-node-example.
It has example usages of the macros described above as well map-par , a parallel, asynchronous equivalent of clojure. To Be Continued 0. The source code is available on GitHub and a distribution package is posted on Clojars. TBC currently lacks support for handling errors that occur during asynchronous computation. Therefore, it is not yet suitable for production use.
Error handling is my next focus and will be available in the 0. In the mean time, the existing functionality should be sufficient to get a feel for the library. Feedback is very welcome, whether as comments here or as issues filed on its GitHub project.
I had high hopes for full-screen Emacs. Unfortunately, neither Eshell nor terminal-mode felt quite right for command line work. And, even with windmove-default-bindings , navigating around the three or four windows I was using to take advantage of the full-screen space was awkward.
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It is a tiling window manager for X Windows that can be controlled completely through the keyboard. Intrigued and excited to incorporate it into my daily work, I set out to get xmonad working full-screen on OS X Lion. It takes some work, and the experience is not seamless—see issues to be aware of, below—but it is good enough to for serious work.
The following sections describe the steps I went through to get xmonad up and running in a full-screen X11 environment on OS X Lion. I assume that you already have Homebrew installed.
To get that functionality, you must install the latest version of XQuartz. Installation is simple: download the XQuartz After installation, log out and log in again. This ensures that XQuartz will be recognized as the default implementation of X. These packages take a while to build. Now is a good time to take a break, stretch your legs, and come back in a few minutes. If they are still building, peruse the xmonad Guided Tour to get a taste for the functionality that you will soon be enjoying. You will not see anything yet.
Open the XQuartz Preferences with Command-, and update the following settings:. We are now ready to toggle full-screen mode with Command-Option-A. After doing so, you should be greeted by a full-screen XTerm. Hitting Option-Shift-Return should open another Xterm. If you use a three-finger left or right swipe to move from the desktop running XQuartz to another desktop or full-screen app and then return, your xmonad windows will likely be missing.
Practice Makes Perfect
Simply click on the XQuartz icon in the dock to bring them back. I have had a few instances in which the Command-Return key sequence to launch a new terminal stops responding.
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But, it is annoying and I typically restart xmonad as soon as I am at a stoping point. If nothing happens, download Xcode and try again. If nothing happens, download the GitHub extension for Visual Studio and try again. Given a number n, print n lines, each with one more asterisk than the last i. Given a number n, print a centered diamond with your name in place of the middle line.
Create a FizzBuzz method that prints out the numbers 1 through Instead of numbers divisible by three print "Fizz".
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Instead of numbers divisible by five print "Buzz". Instead of numbers divisible by three and five print "FizzBuzz". Write a method generate int n that given an integer N will return a list of integers such that the numbers are the factors of N and are arranged in increasing numerical order. For example, generate 1 should return an empty list and generate 30 should return the numbers: 2,3,5. Skip to content. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Sign up.
Related Fizz: Three Essays About Programming
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