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Matteo Spreafico

Joe Duffy's Weblog - OnBeingStateful - 0 views

www.bluebytesoftware.com/...OnBeingStateful.aspx

threading Functionallanguages F# STM MultiThreading Frontiers

shared by Matteo Spreafico on 10 Aug 09 - Cached
  • The biggest question left unanswered in my mind is the role state will play in software of the future.
  • The biggest question left unanswered in my mind is the role state will play in software of the future. That seems like an absurd statement, or a naïve one at the very least.  State is everywhere: The values held in memory. Data locally on disk. Data in-flight that is being sent over a network. Data stored in the cloud, including on a database, remote filesystem, etc. Certainly all of these kinds of state will continue to exist far into the future.  Data is king, and is one major factor that will drive the shift to parallel computing.  The question then is how will concurrent programs interact with this state, read and mutate it, and what isolation and synchronization mechanisms are necessary to do so?
  • Many programs have ample gratuitous dependencies, simply because of the habits we’ve grown accustomed to over 30 odd years of imperative programming.  Our education, mental models, books, best-of-breed algorithms, libraries, and languages all push us in this direction.  We like to scribble intermediary state into shared variables because it’s simple to do so and because it maps to our von Neumann model of how the computer works.
  • ...3 more annotations...
  • We need to get rid of these gratuitous dependencies.  Merely papering over them with a transaction—making them “safe”—doesn’t do anything to improve the natural parallelism that a program contains.  It just ensures it doesn’t crash.  Sure, that’s plenty important, but providing programming models and patterns to eliminate the gratuitous dependencies also achieves the goal of not crashing but with the added benefit of actually improving scalability too.  Transactions have worked so well in enabling automatic parallelism in databases because the basic model itself (without transactions) already implies natural isolation among queries.  Transactions break down and scalability suffers for programs that aren’t architected in this way.  We should learn from the experience of the database community in this regard
  • There will always be hidden mutation of shared state inside lower level system components.  These are often called “benevolent side-effects,” thanks to Hoare, and apply to things like lazy initialization and memorization caches.  These will be done by concurrency ninjas who understand locks.  And their effects will be isolated by convention.
  • Even with all of this support, we’d be left with an ecosystem of libraries like the .NET Framework itself which have been built atop a fundamentally mutable and imperative system.  The path forward here is less clear to me, although having the ability to retain a mutable model within pockets of guaranteed isolation certainly makes me think the libraries are salvageable.  Thankfully, the shift will likely be very gradual, and the pieces that pose substantial problems can be rewritten in place incrementally over time.  But we need the fundamental language and type system support first.
David Corking

Alarming Development : JavaScript is good enough | Jan 2009 - 0 views

alarmingdevelopment.org/?p=191

CLI Java javascript

shared by David Corking on 27 Apr 09 - Cached
  • It is impossible to build a hash table in JavaScript that works on arbitrary objects. You would have to manually allocate unique ID’s for every object and include them in the toString. So no collections in JavaScript. Adobe provides a true built-in hashtable in ActionScript 3.
  • Objects can function as sets and maps. Arrays can function as lists and iterators (generate an array when you need an iterator). More that good enough in this context.
  • VB also often compiles down to better MSIL than C#. It is also the only .NET language with first-class edit-and-continue Lisp-like debugging capabilities.
  • ...1 more annotation...
  • a good collection library should support a meta-object protocol with features like rejecting changes. This allows collections to be passed around as references,
  • David Corking on 27 Apr 09
     
    An old-fashioned language war, 2009 style. Visual Basic even gets a mention as "Lisp-like" (for its debugging.)
David Corking

JavaScript as a Functional Language | Ajaxonomy | 2009 - 0 views

www.ajaxonomy.com/...cript-as-a-functional-language

Functional programming Lisp Web development

shared by David Corking on 09 Apr 09 - Cached
  • there is a little bit of hand-waving involved in calling JavaScript a functional language. JavaScript is not a side-effect free language, nor is it an expression-based language (i.e., it is not value-oriented, but rather variable-oriented). There is no tail call optimization in any of the current implementations, so recursion must be kept shallow. And the list goes on. Truth be told, JavaScript is really one of the first hybrid imperative-functional languages.
  • Higher-order functions allow us to do functional composition,
  • Since JavaScript does not have "overloaded" functions, this type of functionality is usually simulated using manipulation of the function's arguments. Currying comes in handy because it allows you to do this manipulation in a much cleaner and more modular way.
  • ...1 more annotation...
  • Closures have quite a few applications in real-world JavaScript: event binding, callbacks, sorting, mapping (in the classical Lisp sense), and many others. In more modern JavaScript programming, you can find them almost everywhere.
  • David Corking on 09 Apr 09
     
    This is a short tutorial approach to an old but little-noticed saw.
Wicked Tunez

Sample Fluent NHibernate T4 Templates for Code Generation via LINQ To SQL - 0 views

www.pnpguidance.net/...esCodeGenerationLINQToSQL.aspx

NHibernate mapping generator t4

shared by Wicked Tunez on 16 Jun 11 - Cached
  • Wicked Tunez on 16 Jun 11
     
    Sample Fluent NHibernate T4 Templates for Code Generation 
gpryor3

HTML Attributes - 1 views

www.w3schools.com/...html_attributes.asp

chrome html wiki

shared by gpryor3 on 12 Aug 18 - No Cached
  • All HTML elements can have attributes
  • always specified in the start tag
  • provide additional information
  • ...24 more annotations...
  • about an element
  • usually come
  • name/value pairs
  • name="value
  • links are defined
  • with
  • <a> tag
  • link address is specified
  • href attribute:
  • mages are defined with
  • <img> tag.
  • The alt attribute
  • specifies an alternative text to be used
  • when an image cannot be displayed.
  • style attribute
  • specify the styling of an element
  • color, font, size etc
  • tyling later in this tutorial, and in our CSS Tutorial.
  • a title attribute is added to the <p> elemen
  • value of the title attribute
  • isplayed as a tooltip
  • Use Lowercase Attributes
  • Quote Attribute Values
  • HOW TO Tabs Dropdowns Accordions Convert Weights Animated Buttons Side Navigation Top Navigation Modal Boxes Progress Bars Parallax Login Form HTML Includes Google Maps Range Sliders Tooltips Slideshow Filter List Sort List
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shared by buyglobalsmm1 on 29 Aug 23 - No Cached
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7 Best Sites to Buy Google 5 Star Reviews (Non-Drop & 5 Star) - 0 views

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shared by buy5starshop5623 on 23 Mar 25 - No Cached
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