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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
jackmcmahon4

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shared by jackmcmahon4 on 05 Aug 23 - No Cached
  • jackmcmahon4 on 05 Aug 23
     
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  • jackmcmahon4 on 06 Aug 23
     
    Buy Verified Stripe Account Introduction A verified Stripe account is one that has been examined and certified by Stripe as belonging to a real company. This indicates that Stripe has received all necessary information and documentation from the account holder and that Stripe has confirmed that the account is actually owned and run by an authorized company. What is a Verified Stripe Account? A verified Stripe account is one that has been examined and certified by Stripe as belonging to a real company. This indicates that Stripe has received all necessary information and documentation from the account holder and that Stripe has confirmed that the account is actually owned and run by an authorized company. Buy Verified Stripe Account The benefits of having a verified Stripe account are numerous. The first benefit is that you can accept payments from well-known credit cards. If you operate an online business, this is a huge advantage because it enables you to take payments from a far wider spectrum of clients. You also have access to Stripe's Fraud Protection service through this. This solution can save you money by assisting you in preventing chargebacks and other fraudulent activities a large sum of money over time. In general, it is a good idea to have a verified Stripe account. It gives you access to Fraud Protection, enables you to take payments from popular credit cards, and can ultimately help you save money. Verifying your account is undoubtedly worthwhile if you operate an internet business. How Do I Buy Verified Stripe Account? You might want to purchase a verified Stripe account for a few reasons. First, having a verified account is crucial if you're going to use Stripe to handle payments. This will give your consumers peace of mind that their money is safe. Second, if you process a lot of payments, a verified account also enables you to benefit from Stripe's greater transaction limits. Last but not least, having a verified account gives you access
  • jackmcmahon4 on 06 Aug 23
     
    Buy Verified Stripe Account Introduction A verified Stripe account is one that has been examined and certified by Stripe as belonging to a real company. This indicates that Stripe has received all necessary information and documentation from the account holder and that Stripe has confirmed that the account is actually owned and run by an authorized company. What is a Verified Stripe Account? A verified Stripe account is one that has been examined and certified by Stripe as belonging to a real company. This indicates that Stripe has received all necessary information and documentation from the account holder and that Stripe has confirmed that the account is actually owned and run by an authorized company. Buy Verified Stripe Account The benefits of having a verified Stripe account are numerous. The first benefit is that you can accept payments from well-known credit cards. If you operate an online business, this is a huge advantage because it enables you to take payments from a far wider spectrum of clients. You also have access to Stripe's Fraud Protection service through this. This solution can save you money by assisting you in preventing chargebacks and other fraudulent activities a large sum of money over time. In general, it is a good idea to have a verified Stripe account. It gives you access to Fraud Protection, enables you to take payments from popular credit cards, and can ultimately help you save money. Verifying your account is undoubtedly worthwhile if you operate an internet business. How Do I Buy Verified Stripe Account? You might want to purchase a verified Stripe account for a few reasons. First, having a verified account is crucial if you're going to use Stripe to handle payments. This will give your consumers peace of mind that their money is safe. Second, if you process a lot of payments, a verified account also enables you to benefit from Stripe's greater transaction limits. Last but not least, having a verified account gives you access
batif1991

Why to use AWS control tower and how it can help your organization to handle multiple A... - 1 views

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shared by batif1991 on 10 Jan 22 - No Cached
  • batif1991 on 10 Jan 22
     
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Paris Polyzos

Refact your C# Code: NCQRS - 0 views

refact.blogspot.com/...ncqrs.html

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shared by Paris Polyzos on 11 Nov 10 - No Cached
  • Paris Polyzos on 11 Nov 10
     
    NCQRS is a framework implementation of CQRS pattern to separate data modifications operations from data query operations!
anonymous

Traits - 0 views

www.iam.unibe.ch/...index.html

traits programming

shared by anonymous on 22 Dec 08 - Cached
  • anonymous on 22 Dec 08
     
    Traits are a simple composition mechanism for structuring object-oriented programs. A Trait is essentially a parameterized set of methods; it serves as a behavioral building block for classes and is the primitive unit of code reuse. With Traits, classes are still organized in a single inheritance hierarchy, but they can make use of Traits to specify the incremental difference in behavior with respect to their superclasses. Unlike mixins and multiple inheritance, Traits do not employ inheritance as the composition operator. Instead, Trait composition is based on a set of composition operators that are complementary to single inheritance and result in better composition properties.
lambdatestteam

Cross Browser Compatibility Testing - 0 views

www.lambdatest.com/feature

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shared by lambdatestteam on 17 Jul 19 - No Cached
  • lambdatestteam on 17 Jul 19
     
    Perform live interactive multi browser testing on browser and operating system environment of your choice. Get instant access to a real machine running desired browser, browser version, operating system, and resolution.
itguru

iOS Online Training | iOS App Development Online Course in India | Online IT Guru - 0 views

onlineitguru.com/online-training-placement.html

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shared by itguru on 15 Nov 17 - No Cached
  • itguru on 15 Nov 17
     
    ios is a mobile operating system created and developed by Apple Inc.It is the operating system presently powers many of the company's mobile devices, .more at ios Online training Hyderabad.
titansuhe

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shared by titansuhe on 27 Jul 22 - No Cached
  • titansuhe on 27 Jul 22
     
    TITANSUHE' s air hoist features with 100% duty rate and quiet operation, is an ideal lifting tool for applications that need an uninterrupted continuous operation. The variable-speed operation provides smooth starts and stops, and the loads and hoist can be well protected even under rough operation.
David Rietz

Graph Database Tutorial - 0 views

infogrid.org/...ons-on-a-graph-database-part-1

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shared by David Rietz on 14 Jul 10 - Cached
  • David Rietz on 14 Jul 10
     
    Graph databases are still quite unfamiliar to many developers. This is the first post in a series discussing the operations a graph database makes available to the developer. Just like there are only so many different things you can do on a relational database (like CREATE TABLE or INSERT), there are only so many things you can do on a graph database. It is worth looking at them one at a time, and that's the goal of this series.
Fabien Cadet

Programming as if Performance Mattered, by James Hague [2004-04-04] - 3 views

dadgum.com/performance.html

optimization low-level erlang

shared by Fabien Cadet on 01 Nov 09 - Cached
  • I frequently see bare queries from programmers in discussion forums, especially from new programmers, who are worried about performance. These worries often stem from popular notions about what operations are "slow." Division. Square roots. Mispredicted branches. Cache unfriendly data structures.
  • Inevitably someone chimes in that making out-of-context assumptions, especially without profiling, is a bad idea. And they're right.
  • The golden rule of programming has always been that clarity and correctness matter much more than the utmost speed. Very few people will argue with that. And yet do we really believe it? If we did, then 99% of all programs would be written in something like Python. Or Erlang.
  • ...5 more annotations...
  • At the same time, such concerns and advice seem to remain constant despite rapid advances in hardware.
  • That tempting, enticing, puzzle-solving activity called "optimization," it hasn't gone away either.
  • Only now the process is on a different level. It isn't machine level twiddling and cycle counting, but it isn't simply mathematical analysis of algorithms either.
  • The big difference is that the code changes I made are substantially safer than running a program and having it silently hang the system. All array accesses are bounds-checked. There's no way to accidentally overwrite a data structure. There's no way to create a memory leak.
  • Really, this is what those cycle-counting programmers from 1985 dreamed of.
  • Fabien Cadet on 01 Nov 09
     
    « I frequently see bare queries from programmers in discussion forums, especially from new programmers, who are worried about performance. These worries often stem from popular notions about what operations are "slow." Division. Square roots. Mispredicted branches. Cache unfriendly data structures. »
jackmcmahon4

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shared by jackmcmahon4 on 05 Aug 23 - No Cached
  • jackmcmahon4 on 05 Aug 23
     
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Andrey Karpov

I beg recommend to your colleagues the our big 64-bit C/C++ guide. - 0 views

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shared by Andrey Karpov on 12 Feb 13 - No Cached
  • Andrey Karpov on 12 Feb 13
     
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Niravkumar Naik

non preemptive scheduling algortihm - 0 views

www.niravsai.blogspot.com/...f-non-preemptive-priority.html

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shared by Niravkumar Naik on 16 Aug 12 - No Cached
  • Niravkumar Naik on 16 Aug 12
     
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Imran Abdul Ghani

Performing CRUD operations using ASP.NET Web API - Part 1 - 0 views

www.webdevelopmenthelp.net/...-operations-using-web-api.html

ASP.NET MVC Web API

shared by Imran Abdul Ghani on 27 Dec 13 - No Cached
  • Imran Abdul Ghani on 27 Dec 13
     
    ASP.NET Web API is a framework that simplifies the creation of HTTP services. We can build loosely coupled services as Web API follows REST architecture. Another advantage of using HTTP services is that I can be consumed by a wide range of clients.
edy muryanto

What is API (Application Program Interface) - 0 views

smartphones-verizon.blogspot.com/...s-api-application-program.html

application

shared by edy muryanto on 13 Sep 13 - No Cached
  • edy muryanto on 13 Sep 13
     
    Application, System call interface serves as a liaison between the API and system call is understood by the operating system. System call interface will translate commands in the API and then will call the system calls required.
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