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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
Rick Fan

Setting up extension development environment - MDC - 0 views

developer.mozilla.org/...ension_development_environment

develop firefox mozilla

shared by Rick Fan on 11 Oct 08 - No Cached
  • javascript.options.showInConsole = true. Logs errors in chrome files to the Error Console. nglayout.debug.disable_xul_cache = true. Disables the XUL cache so that changes to windows and dialogs do not require a restart. This assumes you're using directories rather than JARs. Changes to XUL overlays will still require reloading of the document overlaid. browser.dom.window.dump.enabled = true. Enables the use of the dump() statement to print to the standard console. See window.dump for more info. You can also use nsIConsoleService from privileged script. javascript.options.strict = true. Enables strict JavaScript warnings in the Error Console. Note that since many people have this setting turned off when developing, you will see lots of warnings for problems with their code in addition to warnings for your own extension. You can filter those with Console2. extensions.logging.enabled = true. This will send more detailed information about installation and update problems to the Error Console.
subsequent1 subsequent1

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started by subsequent1 subsequent1 on 09 Jan 14 no follow-up yet
trimantra

How to do windows authentication on ASP.NET Development Server | Trimantra Blog - 0 views

blog.trimantra.com/-on-asp-net-development-server

windows authentication asp asp net net development server

shared by trimantra on 03 Jun 15 - No Cached
  • trimantra on 03 Jun 15
     
    Follow the below steps: Go to Project->Properties->Web Select "NTLM Authentication" check box to True Modify authentication mode to windows
  • trimantra on 03 Jun 15
     
    Follow the below steps: Go to Project->Properties->Web Select "NTLM Authentication" check box to True Modify authentication mode to windows
Andrey Karpov

Test trivial code - 0 views

blog.ploeh.dk/...test-trivial-code

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shared by Andrey Karpov on 09 Mar 13 - No Cached
  • Andrey Karpov on 09 Mar 13
     
    A few days ago, Robert C. Martin posted a blog post on The Pragmatics of TDD, where he explains that he doesn't test-drive everything. Some of the exceptions he give, such as not test-driving GUI code and true one-shot code, make sense to me, but there are two exceptions I think are inconsistent. Robert C. Martin states that he doesn't test-drive
y cakephp

CakePHP Website Development-A Landmark in PHP Development! - 0 views

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shared by y cakephp on 13 Jun 13 - No Cached
  • y cakephp on 13 Jun 13
     
    CakePHP is basically an open-source framework that makes web development actually a piece of cake in true sense. CakePHP was launched back in 2005 and its development has gained wide acceptance.
Biztech Consultancy

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biztechconsultancy.wordpress.com/...om-web-application-development

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shared by Biztech Consultancy on 02 Jul 13 - No Cached
  • Biztech Consultancy on 02 Jul 13
     
    Developing web applications for businesses is a complex task. And this is especially true in case of Custom Web Application Development. It requires a great deal of technical expertise, patience, experience and programming knowledge to churn out powerful web applications exactly as per your client's demands.
subsequent1 subsequent1

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David Corking

The dumbing down of technology | Tony Lawrence | 2008 - 0 views

aplawrence.com/...dumbdown.html

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shared by David Corking on 30 Apr 09 - Cached
  • David Corking on 30 Apr 09
     
    I love this article. Lawrence is 60 and can perhaps afford to be sanguine, but I am glad he is warning the rest of us.
  • David Corking on 30 Apr 09
     
    Some quotable quotes here: "while we laugh at the guy who expected that his computer could be hooked up to his boom box to use the cd, he's actually just a bit ahead of us. Yes, ahead, not behind. In the future, he probably could get his computer to talk the boom box into transferring data from its cd." "When I was a teenager, I had a friend who made extra money testing and changing vacuum tubes in TV's and radios. Try earning money that way today- there is actually a very small market for that kind of thing, and there are still people who sell tubes and the like, but that market is pretty small. In the dumbed down computers of the future, there may still be a few antique machines kicking around here and there, but that isn't going to support very many of us." This is largely true and happening all the time. A programmer can use Python or Smalltalk without needing to know C (or Fortran or assembler.) A child can program in Morphic tiles (Etoys and Scratch)! We don't need to know the difference between a serial cable and a printer cable, or how to install a driver' it is all USB (or Bluetooth!) There are some gurus that program USB, but perhaps only a few hundred of them, and the rest of us just use it.
ma rody candera

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dd-idham.blogspot.com/...irl-is-talisman-of-safety.html

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shared by ma rody candera on 26 Mar 11 - No Cached
  • ma rody candera on 26 Mar 11
     
    A joint military action Libyan tanks bombarding the looming death in the eyes of Muammar Gaddafi. But he always survived. Is it true that dozens of virgins to be the source of spiritual power?
Meet John

Buy Instagram Followers and Likes | 480-624-2599 - 0 views

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shared by Meet John on 28 Nov 14 - No Cached
  • Meet John on 28 Nov 14
     
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maesriady

Nano Teknologi - Free Template Premium - 0 views

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shared by maesriady on 19 Nov 15 - No Cached
  • maesriady on 19 Nov 15
     
    Hi I want to ask all your friends on this site safe is it true we downloaded the templates of premium as of themeforest.net This is a website that provides premium template for free. Please help Thank you
lucyll

Rip 4K Blu-ray to USB for 4K Ultra TV - YouTube - 0 views

www.youtube.com/watch

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shared by lucyll on 01 Apr 17 - No Cached
  • lucyll on 01 Apr 17
     
    While it comes to a true 4K Blu-ray disc, many 4K Blu-ray rippers fail to rip it cause a 4K Blu-ray has higher and stricter encryption and normal Blu-ray decrypter can't bypass all the copyright protection. Although many Blu-ray Rippers fail to rip 4K Blu-ray, there is still one decrypter tool can offer nearly perfect work. That is Pavtube ByteCopy which can copy, rip and remux 4K Blu-ray discs easily.
jackmcmahon4

Buy Google Ads Account - Real, Cheap, Aged, Spent ⚡️ - 0 views

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shared by jackmcmahon4 on 31 Jul 23 - No Cached
  • jackmcmahon4 on 31 Jul 23
     
    Buy Google Ads Account Introduction If you are looking to buy Google Ads Accounts we can help you. Here are some reasons why you should buy PVA accounts from us: Looking to buy Google Ads Accounts If you're looking to buy Google Ads Accounts, we offer a variety of packages that can help you get started. We offer accounts with varying limits on the number of ads that can be run at once, as well as different options for payout amounts and costs (depending on your budget). You'll also be able to choose whether or not your account is part of our main product line or if it's an offshoot. This way, if there are any changes in how our products work or evolve over time-or even if there's no need at all-you won't miss out on anything! What are the rules in google ads accounts? Google Ads accounts let you create and manage your own campaign, which can be used to drive traffic to a website or an email list. However, the rules are pretty strict. Here's what you need to know: You can use Google Ads for your business' own purposes only. For example, if you have a side hustle as a freelancer, this is not allowed because it will affect the quality of your main business' listings in search results (for example). If there are other businesses using the same keywords as yours (either directly or indirectly), then those other businesses may also be affected by this rule. You cannot use Google Ads Accounts for any friend's business except those who are family members living at home with them; friends who work together professionally; close colleagues from college days; ex-girlfriends/boyfriends whose relationship ended badly during high school years; any person(s) who has been convicted of crimes involving fraudulently obtaining money from others through false promises made while applying for jobs/jobs interviews etc., even if they were pardoned afterwards Buy Google Ads Account Google Ads Account Looking to buy Google Ads Accounts If you're looking to bu
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jackmcmahon4

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shared by jackmcmahon4 on 31 Jul 23 - No Cached
  • jackmcmahon4 on 31 Jul 23
     
    Buy Elite Yelp Reviews Introduction Yelp is a great way to get reviews for your business. But if you want to ensure that your Yelp reviews are unique and genuine, it's important to use the best services on the market. Elite Yelp Reviews is one such service that can help you gain more visibility online through its high-quality content and professional services. What You Need to Know About Elite Yelp Reviews The first thing you need to know about Elite Yelp Reviews is that they are not the same as regular reviews. In fact, they can be even better! Elite reviews have a higher quality rating than regular ones do and are written by users who have received extensive training on how to write effective customer testimonials. This means that your business will be able to get more clients who trust what they read in these reviews and feel confident buying from you because of them. Buy Elite Yelp Reviews One thing that I love about having elite Yelp reviews is how easy it was for me just by paying $99 per month (which includes unlimited access) until my account was closed down due to lack of funds six months later." How to Buy Elite Reviews on Yelp How to Buy Elite Reviews on Yelp Yelp is the world's largest local search and discovery engine. They have more than 1 million reviews from their users, which makes it a great place to get professional Elite Reviews for your business. If you're looking for ways to increase your visibility on Yelp and make sure that people are talking about your business, then this guide will show you how! Buy Elite Yelp Reviews How To Get Professional Elite Reviews From Your Business: The Truth About Having Elite Reviews On Yelp & Why It Matters How to Get Professional Elite Reviews From Your Business If you're looking to improve your business, then Elite Yelp Reviews is a great place to start. It's important that you have a good service and product before trying to get professional reviews on Yelp. The best way to do this is by offeri
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IDa Sol

Chiller van rent - Freez Chill - 0 views

freezchill.com/chiller-van-rent

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shared by IDa Sol on 01 Apr 22 - No Cached
  • IDa Sol on 01 Apr 22
     
    Much of the time to keep up with Chiller Van for Rent Dubai. That's the reason for the purchaser needs around the world. Also we have at this point come a decent distance. Now have the ability to land area own or control by someone an electronic request. More than that in Dubai which methods for among our handheld units and claim them bring across inside a couple of days. As much as a result of consistent coordinate activities. Also, on the off chance that organizations are to expand and build in Dubai, they need to support their coordinate something that a person is good at. What's more, they need to have the ability to improve their offer chain to get in extra orders. Also the last leg of the arrange chain is by and large known as past mile dispatch. In almost the same way which complete and total last activity is almost regularly. All the time by a long shot the most tricky. Mostly, it's the higher expense over the span of the past mile. Compare to something else, that adds to most of the issue. As well as it true that you are aware careful that the last leg of bus, car, train, etc. Ofcourse can contain up to 20% of an item's.
Felipp Crawly

Success has a New Name; Onward Process - 1 views

started by Felipp Crawly on 26 Nov 12 no follow-up yet
htmlslicemate.com

5 Tips on Picking Great Images for Your Articles - 0 views

designdisease.com/great-images-for-your-articles

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shared by htmlslicemate.com on 31 May 13 - No Cached
  • htmlslicemate.com on 31 May 13
     
    Articles with pictures accompanying them are proven to get clicked on at a higher rate than text-only articles. Our eyes gravitate to the imagery we spot when we land on a page. This has always been true, dating back centuries. When news was delivered daily inside of newspapers, the papers always featured a prominent and attractive photo on their covers. Today, on the internet, a primarily visual medium, the raw communicative power of imagery has increased exponentially. Picking the right photo, though, can be daunting, difficult, or time-consuming.............................
Justin Pierce

The Most Excellent Bookkeeping Services - 1 views

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started by Justin Pierce on 13 Feb 13 no follow-up yet
Duane Jennings

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shared by Duane Jennings on 25 Apr 12 - No Cached
  • So far, bostonglobe.com has published only one responsive ad. “Ad servers aren’t really ready for it yet, and advertisers aren’t quite (ready either),” Moriarty said.
    • Duane Jennings
      Duane Jennings on 25 Apr 12
       
      This is the huge revenue advantage that having a separate mobile page has over a single adaptive page. Having a separate mobile page does not mean the content has to be maintained in two different places though. Your CMS should handle the content in one place and still be able to display the content differently based on the device. Adaptive layout on one page just puts the burden on the phone and client PC to adjust the display rather than the CMS doing it before sending to the client. Many are doing adaptive layout wrong by sending all assets and content to phone devices which is not only bad for performance but also for user experience as it makes the page render slower.
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