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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
omouse

Software Engineering Code of Ethics and Professional Practice - Association for Computing Machinery - 0 views

www.acm.org/se-code

software code ethics programming develop Development Reference Software Testing Quality Assurance

shared by omouse on 08 Aug 10 - Cached
  • Approve software only if they have a well-founded belief that it is safe, meets specifications, passes appropriate tests, and does not diminish quality of life, diminish privacy or harm the environment. The ultimate effect of the work should be to the public good.
  • Not knowingly use software that is obtained or retained either illegally or unethically.
  • Ensure proper and achievable goals and objectives for any project on which they work or propose.
  • ...2 more annotations...
  • Ensure adequate testing, debugging, and review of software and related documents on which they work.
  • Ensure adequate documentation, including significant problems discovered and solutions adopted, for any project on which they work.
omouse

The Graphing Calculator Story - 0 views

www.nucalc.com/Story

graphing story calculator apple the fun history programming Development

shared by omouse on 08 Aug 10 - Cached
  • I used to be a contractor for Apple, working on a secret project. Unfortunately, the computer we were building never saw the light of day. The project was so plagued by politics and ego that when the engineers requested technical oversight, our manager hired a psychologist instead. In August 1993, the project was canceled. A year of my work evaporated, my contract ended, and I was unemployed.
    • omouse
      omouse on 08 Aug 10
       
      This is why free/open source software is a good idea. If a company kills a project it could still be a benefit to the rest of the software world.
Maxime Lagacé

ASP.NET - WinForms - WPF - Silverlight Controls & Components, Reporting Tools, App Frameworks, Add-ins for Visual Studio & Delphi-C++Builder - 0 views

devexpress.com

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shared by Maxime Lagacé on 24 Aug 10 - Cached
  • Maxime Lagacé on 24 Aug 10
     
    BEST tools for grids, charts, etc with .net and silverlight
Joel Bennett

Good Math, Bad Math : The "C is Efficient" Language Fallacy - 0 views

scienceblogs.com/...c_is_efficient_language_fa.php

c++ develop languages rants reference

shared by Joel Bennett on 08 Feb 07 - Cached
  • Here's the problem. C and C++ suck rocks as languages for numerical computing. They are not the fastest, not by a longshot. In fact, the fundamental design of them makes it pretty much impossible to make really good, efficient code in C/C++.
  • Joel Bennett on 08 Feb 07
     
    An informed rant on why C/C++ are NOT the fastest programming languages, but merely the "closest to the metal."
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knowuh not saying

Publications - Java News Brief - Object Computing, Inc. - 0 views

ociweb.com/...jnb.html

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shared by knowuh not saying on 04 Jun 08 - Cached
  • knowuh not saying on 04 Jun 08
     
    a nice monthy publication of java articles.
Adildi ldinlio

Building Resilient IP Networks - Cisco Press | Free Ebooks Download - 0 views

www.ebook-x.com/ing-resilient-ip-networks.html

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shared by Adildi ldinlio on 24 Oct 08 - Cached
  • Adildi ldinlio on 24 Oct 08
     
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Adildi ldinlio

Create Your Own Home Networks - Sams | Free Ebooks Download - 0 views

www.ebook-x.com/te-your-own-home-networks.html

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shared by Adildi ldinlio on 24 Oct 08 - Cached
  • Adildi ldinlio on 24 Oct 08
     
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Adildi ldinlio

Adobe Creative Suite 3 Web Premium All-in-One Desk Reference For Dummies|free ebooks download - 0 views

www.ebook-x.com/esk-reference-for-dummies.html

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shared by Adildi ldinlio on 18 Oct 08 - Cached
  • Adildi ldinlio on 18 Oct 08
     
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Adildi ldinlio

ASP.NET Solutions - 23 Case Studies|free ebooks download - 0 views

www.ebook-x.com/solutions-23-case-studies.html

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shared by Adildi ldinlio on 16 Oct 08 - Cached
  • Adildi ldinlio on 16 Oct 08
     
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Adildi ldinlio

Pro Web 2.0 Application Development with GWT - free ebooks download - 0 views

www.ebook-x.com/tion-development-with-gwt.html

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shared by Adildi ldinlio on 14 Oct 08 - Cached
  • Adildi ldinlio on 14 Oct 08
     
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Adildi ldinlio

Hacker Linux Uncovered|free ebooks download - 0 views

www.ebook-x.com/hacker-linux-uncovered.html

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shared by Adildi ldinlio on 13 Oct 08 - Cached
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David Corking

Remember Smalltalk? | Gartner Blogs 2008 - 1 views

blogs.gartner.com/...remember-smalltalk

Squeak

shared by David Corking on 18 May 09 - Cached
  • 2) If you are BIG fan of dynamics languages (closures, meta programming, and all that cool stuff) then consider giving Smalltalk a look.  You might like what you see.  Its like Ruby but with bigger muscles.  You think Rails is cool? Check out seaside. In the end we’ll see a up tick in Smalltalk momentum over the next few years. 
  • Please don’t talk about Smalltalk. I enjoy my competitive advantage over the Java/NET crowd
  • Where Smalltalk really shines recently is in field of web applications due to its dynamic nature (live upgrading, debugging etc.) and because its shortcoming are not relevant here.
  • ...9 more annotations...
  • On the Desktop - Dolphin creates 500k exe’s with ease - its a 1 button click (you just have to follow some of their easy put things in packages rules).
  • Remember LAN MAN? OS2? Both were heavily endorsed by Gartner.
  • I laugh when people say poor performance on older hardware was a mjor Smalltalk weakness. We routinely delivered applications that ran on 386 and 68020 processors with 8MB RAM. And yes, they were quite snappy. No, the reason Smalltalk didn’t catch on is because Sun spent more money on Java marketing than was spent on all computer languages combined, since the dawn of time.
  • I’ve listened personally to whiny ROR programmers groan and whine about PHP devs LEARNING ROR and undercutting them.
  • I didn’t fall for it for the marketing. I fell for WORA, for the language/runtime separation, for the multi-vendor approach (Sun never wanted to be the single provider for any Java centric product niche, and in fact was never the leader), for the comprehensive set of vendor-neutral APIs for all sorts of execution environments/applications,
  • For now I would like to see more use of Smalltalk like constructs in Java (Groovy).
  • Smalltalk must have sofisticated CASE tools, business process simulation tools, large development environments etc. etc. etc.
  • I stayed to teach Smalltalk since 1993 and am very happy about this information. Each academic year, we produce a small group of new Smalltalkers in the Czech Republic.
  • Joe Barnhart // Apr 4, 2009 at 2:48 pm At the company where I work, we have used Smalltalk for 19 years. Our tiny team of programmers has beat the pants off of competitors who employ teams 100 times our size.
  • David Corking on 18 May 09
     
    trend spotting
vikramsjn

Code of Ethics - Association for Computing Machinery - 0 views

www.acm.org/code-of-ethics

ethics acm moral professional leadership programming reference

shared by vikramsjn on 12 Mar 10 - Cached
  • vikramsjn on 12 Mar 10
     
    "Contents & Guidelines 1. General Moral Imperatives. 2. More Specific Professional Responsibilities. 3. Organizational Leadership Imperatives. 4. Compliance with the Code. 5. Acknowledgments."
  • vikramsjn on 12 Mar 10
     
    must read for every coder - for his work and career
jackmcmahon4

Buy Bing Ads Accounts - 100% Verified, Ready, Cheap Price & Instant Delivery - 0 views

realserviceit.com/...buy-bing-ads-accounts

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shared by jackmcmahon4 on 31 Jul 23 - No Cached
  • jackmcmahon4 on 31 Jul 23
     
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buyusaco265871

Buy Outlook Accounts - Trading Platform - 0 views

buy5starshop.com/...buy-outlook-accounts

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shared by buyusaco265871 on 23 Mar 25 - No Cached
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