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fspore

Values, Types, and Operators :: Eloquent JavaScript - 0 views

eloquentjavascript.net/01_values.html

javascript programming

shared by fspore on 27 Jun 15 - No Cached
  • Not all operators are symbols. Some are written as words. One example is the typeof operator, which produces a string value naming the type of the value you give it.
  • Having such numbers is useful for storing strings inside a computer because it makes it possible to represent them as a sequence of numbers. When comparing strings, JavaScript goes over them from left to right, comparing the numeric codes of the characters one by one.
  • There is only one value in JavaScript that is not equal to itself, and that is NaN, which stands for “not a number”.
  • ...16 more annotations...
  • In practice, you can usually get by with knowing that of the operators we have seen so far, || has the lowest precedence, then comes &&, then the comparison operators (>, ==, and so on), and then the rest. This order has been chosen such that, in typical expressions like the following one, as few parentheses as possible are necessary:
  • The difference in meaning between undefined and null is an accident of JavaScript’s design, and it doesn’t matter most of the time. In the cases where you actually have to concern yourself with these values, I recommend treating them as interchangeable (more on that in a moment).
  • . Yet in the third expression, + tries string concatenation before numeric addition
  • When something that doesn’t map to a number in an obvious way (such as "five" or undefined) is converted to a number, the value NaN is produced.
  • Further arithmetic operations on NaN keep producing NaN, so if you find yourself getting one of those in an unexpected place, look for accidental type conversions.
  • g ==, the outcome is easy to predict: you should get true when both values are the same, except in the case of NaN.
  • But when the types differ, JavaScript uses a complicated and confusing set of rules to determine what to do. In most cases, it just tries to convert one of the values to the other value’s type. However, when null or undefined occurs on either side of the operator, it produces true only if both sides are one of null or undefined.
  • That last piece of behavior is often useful. When you want to test whether a value has a real value instead of null or undefined, you can simply compare it to null with the == (or !=) operator.
  • The rules for converting strings and numbers to Boolean values state that 0, NaN, and the empty string ("") count as false, while all the other values count as true.
  • where you do not want any automatic type conversions to happen, there are two extra operators: === and !==. The first tests whether a value is precisely equal to the other, and the second tests whether it is not precisely equal. So "" === false is false as expected.
  • The logical operators && and || handle values of different types in a peculiar way. They will convert the value on their left side to Boolean type in order to decide what to do, but depending on the operator and the result of that conversion, they return either the original left-hand value or the right-hand value.
  • The || operator, for example, will return the value to its left when that can be converted to true and will return the value on its right otherwise. This conversion works as you’d expect for Boolean values and should do something analogous for values of other types.
  • This functionality allows the || operator to be used as a way to fall back on a default value. If you give it an expression that might produce an empty value on the left, the value on the right will be used as a replacement in that case.
  • The && operator works similarly, but the other way around. When the value to its left is something that converts to false, it returns that value, and otherwise it returns the value on its right.
  • Another important property of these two operators is that the expression to their right is evaluated only when necessary. In the case of true || X, no matter what X is—even if it’s an expression that does something terrible—the result will be true, and X is never evaluated. The same goes for false && X, which is false and will ignore X. This is called short-circuit evaluation.
  • - to negate a number
samonjur

Keywodrs is very important for every website. - 0 views

themenplugins.com

Development design Web programming

shared by samonjur on 17 Jun 15 - No Cached
  • samonjur on 17 Jun 15
     
    Simply how much targeted traffic are you currently shedding mainly because an individual never have identified several unexpected yet potent keywords and phrases? Choosing the clear keywords and phrases to your internet pages is easy. And also obtaining connected, high-demand and also low-supply keywords and phrases which can be potent to your web site just isn't too much once you begin making use of Wordtracker. Yet think about people keywords and phrases which can be actually unexpected? Think about keywords and phrases you'll by no means consider, yet which may have the particular prospective to operate a vehicle thousands of fresh visitors to your internet site?Pleasant to be able to Wordtracker Search term Study AccountsBeing a Wordtracker client, you are going to right away acquire totally free usage of the most notable 1, 000 keywords and phrases used throughout the key engines like google : equally short-term and also long-term.And also for a few internet marketers, which is adequate.Nonetheless it just isn't adequate should you have identified the actual prospective regarding working together with one of the most searched-for or perhaps freshly growing keywords and phrases on the web.Significant web marketers and also SEARCH ENGINE MARKETING specialists which are seeking development final results consider Wordtracker's Search term Study Record alternatives: from your Top, 000, entirely for the Leading 20 thousand phrases.Just how these kinds of accounts supply development final resultsCheck our own Search term Study Accounts throughout. Try to find hugely well-known, or perhaps freshly growing phrases and words that might be utilized to make huge amounts regarding fresh targeted traffic.How can this kind of perform? You're not trying to find well-known keywords and phrases that may deliver folks inside from the "front door" of your distinct web site. You are interested in undiscovered jewels that will deliver a large amount regarding targeted traffic inside
Joel Bennett

Using RabbitMQ with C# and .NET - 3 views

www.codethinked.com/...g-RabbitMQ-with-C-and-NET.aspx

Development .Net Queue AMQP RabbitMQ CrossPlatform OpenSource MSMQ

shared by Joel Bennett on 11 Oct 10 - No Cached
  • I'm currently working on a project where I need to be able to transfer a large number of requests via JSON over web services. I need to take some of that data, do some aggregation with it, and store it in a persistent store. In order to allow the data to be reliably processed in a number of different ways, I wanted to place the incoming data into multiple queues and have it processed and then stored.
  • RabbitMQ fits the bill on all of these fronts, is crazy easy to setup and use, and is very fast.
  • RabbitMQ is written in Erlang
  • Joel Bennett on 11 Oct 10
     
    RabbitMQ is a cross-platform implementation of an Advanced Message Qeuing Protocol (AMQP) broker (similar to MSMQ). There's a .Net client, and it allows you to decouple your routing and an message storage, and do so in a cross-platform way.
Joel Bennett

Generate .NET documentation with MindTouch 2010 - MindTouch Developer Blog - 4 views

blog.developer.mindtouch.com/...umentation-with-mindtouch-2010

Development Documentation Sandcastle .Net Generation

shared by Joel Bennett on 08 Oct 10 - No Cached
  • The goal of mindtouch.doc was to generate hierarchical reference documentation that could easily be imported into an MindTouch install.
  • The generated documentation has an external dependency on a template called DocToc. The purpose of this template is to allow simple Table of content customization using DekiScript and to make it easy to include custom css for documentation pages.
  • Joel Bennett on 08 Oct 10
     
    It's like Sandcastle for MindTouch
Joel Bennett

Screencast-O-Matic - 0 views

www.screencast-o-matic.com

@public apps demo media screencapture video

shared by Joel Bennett on 29 Aug 07 - Cached
  • Screencast-O-Matic is the free and easy way to create a video recording of your screen (aka screencast) and upload it for free hosting all from your browser with no install!
Joel Bennett

Weave - Mozilla Labs - 0 views

labs.mozilla.com/weave

bookmarking development firefox portableapps soa social

shared by Joel Bennett on 01 Oct 08 - Cached
  • Ensure that it is easy for people to set up their own services with freely available open standards-based tools
  • Joel Bennett on 01 Oct 08
     
    The next release of Weave (any day now) is expected to include P2P sharing of bookmark folders via XMPP, on top of the ability to synchronize your bookmarks, browsing history, and even your cookies, passwords, and form data...
Joel Bennett

ContestMachine: Promotions Made Easy - 0 views

contestmachine.com

contests promotions webdesign

shared by Joel Bennett on 07 Sep 08 - Cached
  • Joel Bennett on 07 Sep 08
     
    Run a contest or giveaway on your blog or website -- they handle everything from collecting entries to choosing and contacting winners.
Joel Bennett

The PowerShell Guy : PowerShell : Accessing alternate data-streams in NTFS - 0 views

thepowershellguy.com/...f-files-on-an-ntfs-volume.aspx

@public ads development ntfs powershell typedata

shared by Joel Bennett on 21 May 07 - Cached
  • Joel Bennett on 21 May 07
     
    This article about accessing Alternate Data Streams in PowerShell is very interesting because it shows how easy it is to EXTEND a TYPE in PowerShell with some simple XML and a few lines of code.  VERY cool.
Joel Bennett

Microsoft Command Line Standard - 0 views

www.microsoft.com/...cmdline_std.mspx

@public api cli command-line development guidelines_practices specs

shared by Joel Bennett on 17 May 07 - Cached
  • our goal is to present a consistent, composable command line user experience. Achieving that allows a user to learn a core set of concepts (syntax, naming, behaviors, etc) and then be able to translate that knowledge into working with a large set of commands. Those commands should be able to output standardized streams of data in a standardized format to allow easy composition without the burden of parsing streams of output text.
  • Joel Bennett on 17 May 07
     
    Microsoft's new "Command Line Standard" guidance on how to write applications which behave nicely as part of a command line interface pipeline ... specifically, PowerShell Commandlets implement most of this by default, but this willl allow unmanaged apps to better coexist in the PowerShell world ...
Joel Bennett

Perspective - Easy 2D and 3D programming with WPF - Home - 0 views

www.codeplex.com/perspective

.net 3d development graphics wpf

shared by Joel Bennett on 07 May 08 - Cached
  • Joel Bennett on 07 May 08
     
    Perspective is an experimental .NET class library for building WPF user interfaces in 2D and 3D ...
Joel Bennett

C Programming.com - C++ and C Made Easy - 1 views

www.cprogramming.com/tutorial.html

c c++ develop tutorials

shared by Joel Bennett on 08 Feb 07 - Cached
  • Joel Bennett on 08 Feb 07
     
    CProgramming.com is an excellent resource with lots of good tutorials and even quizes to help you asses your skills.
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