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fatimarubiha

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fspore

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

  • 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
Joel Bennett

The Performance of Arrays - Chris Burrows - 2 views

  • arrays of reference types are covariant in their element type, but not safely
  • where did that exception come from? It came from the runtime, which was in a unique position to know what the real type of the array object was, and the real type of the element. It needed to determine if the assignment was allowable and throw if not. Now if you think about this for a minute, you can see that it’s going to have to perform that check for every assignment to an array element
  • arrays are covariant only for reference types?
  • ...3 more annotations...
  • So if I want to have an array of reference types, but get the runtime to treat it like an array of value types, what have I got to do? Just wrap the reference type in a value type
  • So I got rid of that check, right? But I added the initialization of a value type. Did I win or lose? Let’s do some timing to figure it out.
  • when I build Debug binaries, the Reference<T> trick makes my example about three times SLOWER.
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    Arrays are covariant only for reference types. If you use a struct wrapper to turn a reference type into a value type, the initialization of the value type takes less time than array assignment.
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How to control your Amazon cloud spending? - 4 views

shared by alex gross on 14 Oct 10 - No Cached
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Joel Bennett

Install multiple versions of IE on your PC | TredoSoft - 0 views

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    An installer for slightly hacked older versions of Internet Explorer so they can run side-by-side on Windows XP for testing websites. I wonder how trustworthy tredosoft is?
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Sandcastle - August 2006 Community Technology Preview (CTP) - 0 views

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    Sandcastle is the official Microsoft MSDN documentation generator. It's like NDoc, except Sandcastle can reflect over the source assemblies and works even when there are no XML documentation comments.
Joel Bennett

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

  • 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++.
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    An informed rant on why C/C++ are NOT the fastest programming languages, but merely the "closest to the metal."
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ASP.NET Common authentication between 1.1 & 2.0? - 0 views

  • decryption="3DES"
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    It is possible to have single-sign-on across ASP.NET 1.1 and 2.0 applications, if you know the secret.
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Doing Objects in VB.NET and C# - TerrySmith.net - 0 views

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    A basic eBook on object-oriented programming in VB.NET and C#. Covers construction and destruction, events, delegates, interfaces and inheritance, and exceptions.
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Joel Bennett

Policy Injection App Block - Behind the Scenes - 0 views

  • We use an interception mechanism to get in the way of calls going to that member, collect a list of policies that apply using a matching rules mechanism, run the chain of handlers specified by those policies in a chain of responsibility and at the other end dispatch the call to the target. Once the target is done - successfully or with exceptions - the stack unwinds, returning through each handler and finally back to the caller.
    • Joel Bennett
       
      So we can only advise "before"
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    Very good read (particularly their evaluation of weaving methods).

    Although as a result their "Policy Injection" application block isn't as powerful as most of the straight-up AOP toolkits out there, it does have a *huge* upside: not only is the code produced by this supportable by Microsoft Product Support, it's now officially part of the Patterns and Practices recommendations!

    The down side is that the only injectable objects are ones created through a "Factory" method (you can't just use the *new* constructor) this brings some performance hits ... but then, you get the ability to separate concerns and apply policies and even business rules after the fact!
Joel Bennett

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Joel Bennett

Graphical vi-vim Cheat Sheet and Tutorial - 0 views

  • With the single exception of the external filter feature ("!"), all functions shown are supported by ViEmu, my commercial add-in that provides advanced vi-vim emulation in Visual Studio.
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    A slick starter tutorial for vi/vim, from the developer of the vi-emulator for Visual Studio.
David Corking

Jonathan Schwartz's Blog: Sun's Network Innovations (3 of 4) - 0 views

  • this datacenter systems market is more than $150b annually. And in this datacenter market we build exceptional systems
  • storage, from our new flash based platforms to eco-efficient tape and archive solutions.
  • more than just naked components, they're engineered with remote management and monitoring, component redundancy, integrated virtualization, and on board storage and networking. That's why our margins are higher than the industry's
  • ...7 more annotations...
  • we now build our entire line of storage systems from general purpose server parts, including Solaris and ZFS, our open source file system.
    • David Corking
       
      So, can anyone build a Sun storage device, or are Sun's "general purpose server parts" better (with better management and redundancy ...) ?
  • using a general purpose OS allows us to easily embrace specialized components (from flash memory to GPU's)
  • why am I paying you a million dollars?" I responded, "You can absolutely run it for free. You just can't call me on Christmas day, you'll be on your own." He gave me the PO.
    • David Corking
       
      Schwartz gives the strong impression of an IT company _without_ its hand in your pocket. It is a similar attitude and reputation, though with proprietary software, rather than services (for free software), that seems to have made Microsoft so wealthy in the late eighties and nineties.
  • Solaris OEM agreements with IBM, Dell, Intel, Fujitsu and HP are so important to our end customers - they know they'll never be locked in.
  • These open source platforms generate, alongside the services attached to them, over a billion dollars a year, making Sun by far and away the world's largest open source software company.
    • David Corking
       
      Hundreds of millions of dollars a year from open source Java alone!
  • Fighting free and open software, like fighting free news or free search, is like fighting gravity - and btw, gravity gets a lot stronger during economic downturns.
    • David Corking
       
      !
  • There is a robust, well-designed open source PBX Server called SipX that is primarily backed by Nortel (due to their acquisition of the creators, Pingtel).
  •  
    Making money - billions of dollars of it - with open specification hardware and open source software
Desktop Computer Support

Desktop Computer Support Gets Rid of Viruses - 2 views

One day, the computers at my small book shop suddenly went crazy. It displays weird characters on the screen and then shut down instantly. I could not do anything about it except to call my trusted...

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started by Desktop Computer Support on 01 Aug 11 no follow-up yet
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