Skip to main content

Home/ Coders/ Group items tagged design Javascript

Rss Feed Group items tagged

Filter: All | Bookmarks | Topics Simple Middle
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
igravitasindia

Website Designing Promote You or Company "24 X 7". Anyone Can't Do Like That - 0 views

www.igravitas.com

web designing company hyderabad web design Web Designing Web Design Service

shared by igravitasindia on 03 Aug 16 - No Cached
  • igravitasindia on 03 Aug 16
     
    Find your company's online reputation with website designing. Web designing with iGravitas TechnoSoft, Hunt the new ways of creative and innovative Website Designing and Development Services Company in Hyderabad, Andhra Pradesh, India. With the assistance of iGravitas, get the best class & eye catch website design that will attract new visitors and transformed them into customers. Customer's desire has become the center of custom website design. We always build client's website with using latest trend & sophisticated technologies like HTML 5.0, CSS 3.0, JQuery, Ajax, JavaScript, Bootstrap, Kendo UI, & Angular JS. After completing web designing & development, we offer 24x7 Client Support and thereafter, any problem we resolve within 4 hour from reporting.
Joel Bennett

openid-selector - javascript magic for OpenID login forms - 1 views

code.google.com/openid-selector

Development Javascript OpenId

shared by Joel Bennett on 01 Jan 10 - Cached
  • Joel Bennett on 01 Jan 10
     
    "This is a simple Javascript OpenID selector. It has been designed so that users do not even need to know what OpenID is to use it, they simply select their account by a recognisable logo. "
Joel Bennett

SproutCore - A Javascript Framework - 1 views

www.sproutcore.com

development frameworks javascript ui web web2.0 webdesign

shared by Joel Bennett on 18 Jun 08 - Cached
  • Joel Bennett on 18 Jun 08
     
    SproutCore is designed to make desktop-like apps for the web using "standard" Html + Css + JavaScript.
Suvi-Tuuli Allan

ScriptLance.com Custom Freelance Programming. Outsource web projects to programmers and... - 0 views

www.scriptlance.com

jobs freelance programming development work

shared by Suvi-Tuuli Allan on 02 Jul 09 - Cached
  • Suvi-Tuuli Allan on 02 Jul 09
     
    Outsource your projects to freelance programmers and designers at cheap prices. Freelancers will compete for your business. Get programming done for your site in php, mysql, xml, perl/cgi, javascript, asp, plus web design, search engine optimization, marketing, writing, job listings and so much more.
Joel Bennett

Volta - Microsoft Live Labs - 0 views

labs.live.com/volta

.net code-generation development microsoft programming research software webdesign

shared by Joel Bennett on 07 Dec 07 - Cached
  • design and build your application as a .NET client application, then assign the portions of the application to run on the server and the client tiers late in the development process. The compiler creates cross-browser JavaScript for the client tier, web services for the server tier, and communication, serialization, synchronization, security, and other boilerplate code to tie the tiers together.
  • Joel Bennett on 07 Dec 07
     
    Volta is to .Net what the Google Web Toolkit is to Java ... except it goes *way* further, because it lets you write a multi-tiered application as a rich-client app and then choose to have the client portion "compile" to HTML+Javascript ...
alex gross

100% Web-Based Working For Web Designers - 22 views

www.webresourcesdepot.com/ased-working-for-web-designers

developer ide web

shared by alex gross on 02 Dec 09 - Cached
  • alex gross on 02 Dec 09
     
    Web applications are offering an almost desktop-like functionality parallel to the increase in the connectivity speeds, wider usage of the cloud (easier scalability) & improvements in JavaScript/RIA development. This article describes free web applications that you can use to create your own web-based design/development environment:
  • Adnan Ahmad on 29 Aug 16
     
    Required backend developer now drop your cv here https://www.owcareers.com/cv-drop-zone
AK B

Google S2 Favicon Converter & Javascript Generator - 0 views

digg.com/d1pAjt

Google Javascript Favicon Generator Converter Image Design Programming

shared by AK B on 20 Apr 09 - No Cached
  • AK B on 20 Apr 09
     
    Links are getting shorter, information smaller and here's another smaller blogroll avatar... the favicon. Google has an online PNG converter for favicon.ico files in the root directory of a domain. eg. http://google.com/favicon.ico Here's a realtime script to help get the favicon link.
Matteo Spreafico

Essential JavaScript And jQuery Design Patterns - A Free New Book - 30 views

addyosmani.com/...essentialjsdesignpatterns

javascript webdevelopment DesignPatterns programming

shared by Matteo Spreafico on 03 Mar 11 - No Cached
Matt JM, xmwx38, and hogonik liked it
  • anonymous on 09 Oct 13
     
    If you want a quality seo service please click here. Many people said about seo. But do not understand about seo itself. I will help you. Please contact me on yahoo messenger .. aming_e@ymail.com or www.killdo.de.gg
jimygill

ChatGPT Impact on App-Dev? GitHub Sites Gives Insight Details:llama 3.1:llama 3.1 githu... - 0 views

marcopolosports.com/a-3-1-githubgithub-compromised

Development @public pas cher develop web Design programming Sac tools

shared by jimygill on 27 Jul 24 - No Cached
  • jimygill on 27 Jul 24
     
    GitHub updated its online data and insights platform that provides info on local and worldwide impact of developers letting using look their own software development trends. Programming languages are famous topic in software development world and tool provides insight into language by country. Javascript has highest ranked programming language based on number of unique developers who uploaded code followed by Shell and Python. The GitHub innovation Graph was updated with Q1 2024 data adding to data troves that started in Q1 2020. The company launched the tool in 2023 with purpose of letting anyone researchers policymakers developers tp access data. Over 22,233,000 American developers and  1220000 American organization are building on GitHub. The US top three collaborators were UK Canada and Germany American developers uploaded code to GitHub over 27.2 million times American developers and organization owned more than 60.5 million repositories on GitHub. One research analyze the impact of ChatGPT on velocity of software development finding that availability of ChatGPT. Increase the number of Git pushes per 100,000 inhabitants of each country Had positive correlation with number of repositories and developers per 100,000 inhabitants High level languages like Javascript, Python impact on domain specific languages like SQL and HTML One study uses Graph data to show how the proliferation of ChatGPT across the world ahs start to enhance developer engagement across various programming languages/
anonymous

PureMVC - 1 views

puremvc.org

framework mvc actionscript flex air java javascript C# php python development

shared by anonymous on 17 Dec 08 - Cached
  • anonymous on 17 Dec 08
     
    PureMVC is a lightweight framework for creating applications based upon the classic Model, View and Controller concept. Based upon proven design patterns, this free, open source framework which was originally implemented in the ActionScript 3 language for use with Adobe Flex, Flash and AIR, is now being ported to all major development platforms.
David Corking

Dr. Dobb's | Smartphone Operating Systems: A Developer's Perspective | March 30, 2009 - 0 views

www.ddj.com/...printableArticle.jhtml

Cellular phones PDA symbian iphone

shared by David Corking on 11 May 09 - Cached
  • The industry stewards have countered Apple's move with their own application stores, so there's a huge opportunity to write the "killer app" for one of several smartphone platforms.
  • 40 MB to less than 4 MB of free RAM
  • one-app-at-a-time requirement complicates any implementation of a copy-and-paste mechanism.
  • ...45 more annotations...
  • As a security sandbox, the iPhone OS permits only one third-party application to run at a time, and not in the background.
  • adding some useful Bluetooth profiles that supported stereo headsets, data synchronization, or the ability to implement multiplayer games would be usefu
  • iPhone OS 3, that provides some of the missing features mentioned here, such as the A2DP profile for Bluetooth, voice recording, and copy-and-paste.
  • Have to learn Objective-C; is only smartphone platform that uses it.
  • Competitors will soon catch up on the UI.
  • embed navigation and GPS plotting into applications.
  • provide their own map content
  • The OS now supports the use of accessories connected to the iPhone either through its 30-pin docking connector or wirelessly via Bluetooth. Now that the device has been "opened", you can expect an entire ecosystem to build up around the device, much like the iPod has.
  • peer-to-peer connectivity using Bonjour
  • developers can now allow users, from within the application, to purchase and obtain new content
  • No voice dial.
  • A client-server mechanism provides access to low-level system resources, and in fact the kernel itself is a server that parcels out resources to those applications that need them. This transaction scheme allows applications to exchange data without requiring direct access to the OS space.
  • C/C++ for porting existing UNIX applications, and Java to port Java ME MIDlets. As mentioned previously, the software stack offers several run-times that offer application development using WRT widgets, Flash, and Python. The primary programming language for the platform is Symbian C++,
  • Handango has managed the wide-scale distribution of Nokia applications. In February, Nokia announced plans to launch its Ovi Store, which sells applications, videos, games, pod-casts and other content, similar to Apple's App Store. The store will be accessible by Nokia S60 smartphones in May.
  • Non-standard Symbian C++ has steep learning curve, with special idioms to master. Large number of Symbian APIs to learn, since it contains hundreds of classes and thousands of member functions.
  • BlackBerry Device Software executes multiple applications simultaneously
  • Manages multiple e-mail Exchange e-mail accounts, along with support for POP3 and SMTP, and e-mails can have file attachments
  • FIPS 140-2 compliant, and supports AES or Triple DES encryption sessions via BlackBerry Enterprise Servers
  • BlackBerry Device Software has enhanced the capabilities of the platform with its own Java virtual machine (JVM), along with new Java classes that offer multitasking capabilities and UI enhancements to go beyond the capabilities of Java ME.
  • You can also take existing Java ME code and add specific BlackBerry classes to make a hybrid Java ME application
  • don't intermix MIDP 2.0 and BlackBerry API calls that perform either screen drawing or application management.
  • The catch to writing an application that uses BlackBerry API extensions is that it ties the application this smartphone. However, this is no worse than using the unique Java classes found in Google's Android.
  • Apple promotes the design goal that applications should accomplish one purpose.
  • no Flash support, and you can't download files.
  • For non-Exchange users, Apple's MobileMe online service, after some fits and starts in 2008, now supports the push of e-mails and changes to the calendar and contacts.
  • The iPhone 3G can work in tandem with Microsoft Exhange Server 2003 and 2007 to support enterprise operations.
  • Cocoa Touch is a subset of Apple's Cocoa,
  • Cocoa Touch components manage most of the writing to the screen and playing media, yet there are APIs exposed that let you access the accelerometer and camera.
  • Quartz engine is identical to the one found in Mac OS X
  • Only a select few higher-level frameworks have access to the kernel and drivers. If necessary, an application can indirectly access some of these services through C-based interfaces provided in a LibSystem library.
  • the SDK provides Dashcode, which is a framework based on a Web page composed of HTML and Javascript. You can use DashCode's simulator to write and test your web application. You can also use several other third-party frameworks to write web applications, and debug these with Aptanna Studio's tools.
  • Made by HTC, the G1 is the first smartphone using the Android platform.
  • e-mail program (which makes use of Google's Gmail), a mapping program (using the company's Google Maps), and a browser that uses WebKit, not Google's Chrome web browser
  • Android is not Java ME, nor does it support such applications
  • ability to both browse and manage multiple IM conversations. On the other hand, such heavy use of the smartphone's CPU shortens battery life significantly. Maybe Apple is on to something in limiting the number of applications that the platform can run.
  • On the positive side, the Android APIs support a touch interface (and the G1 has a capacitive touch screen), but not any multi-touch gestures.
  • copying text from the web pages is the browser isn't allowed
  • The advantage to Android's use of a different bytecode interpreter is that the DVM was designed so that multiple instances of it can run, each in their own protected memory space, and each executing an application. While this approach offers stability and a robust environment for running multiple applications, it does so at the expense of compatibility with Java ME applications.
  • Seasoned Java programmers will find the Android SDK an amalgam of Java SE and Java ME methods and classes, along with unique new ones
  • compile the Java code to generate Dalvik bytecode files, with an extension of .dex. These files, along with the manifest, graphics files, and XML files, are packaged into an .apk file that is similar to a Java JAR file.
  • The certificate that you use to generate the private key does not require a signing authority, and you can use self-signed certificates for this purpose.
  • The Developer Phone provides access to a shipping Android device without the cash outlay or contract contortions required when developing for the other platforms.
  • in February the site began supporting priced applications. Google allows developers to take seventy percent of the proceeds.
  • it's possible that you might pick up a malicious application before it is detected by the user community.
  • Open source, open platform: if you hate the mail program, some third-party is writing a better one.
  • David Corking on 11 May 09
     
    Lengthy developer's overview of Symbian, Mac OS X iPhone, Blackberry, Android. This talks about the leading app platforms except Java ME and Windows Mobile, though it does explain how Blackberry and Symbian support Java ME.
Joel Bennett

EditArea - the code editor in a textarea - 0 views

www.cdolivet.com/index.php

Development WebDesign WebBased Syntax Highlighter Editor Javascript

shared by Joel Bennett on 31 Mar 09 - Cached
  • Joel Bennett on 31 Mar 09
     
    This editor is designed to edit souce code files in a textarea. The main goal is to allow text formatting, search and replace and real-time syntax highlighting ...
1 - 20 of 32 Next ›
Showing 20▼ items per page