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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
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omouse

Shedding Bikes: Common Programmer Health Problems - 0 views

sheddingbikes.com/...1281257293.html

programming Development develop health problems programmer

shared by omouse on 09 Aug 10 - Cached
  • Overall the general cause of all of these problems can be summarized as treating programming as an obsession. You may want to be very good at it, like I did, so you exclude everything else in your life in order to master it. You don't go to the bathroom, you have macho 10 hour coding sessions, you don't eat right, and all manner of mythological beliefs about "real programmers".
  • try to not start at a computer screen for at least 2 hours a whole day
  • Frequently programmers will think that the lighting in a room is what gives them headaches from using a computer, but really it's bad posture, shitty fonts, not drinking enough water, and just using the computer for too long at a stretch
    • omouse
      omouse on 09 Aug 10
       
      very very true
  • ...3 more annotations...
  • I feel more awake and rested during the day. If I stay up late and sleep in I feel like I have a hangover and I can get headaches.
  • If you constantly feel "stiff" or unable to move well, then you probably need to stretch regularly
  • I'm not sure why this is, but a relaxed mind is crucial to spontaneous creativity and idea generation
  • omouse on 09 Aug 10
     
    Programming is a deceptively damaging field to be in, partly because it doesn't seem like you're doing much, and also because of the attitude many programmers have toward their body. You should care about keeping yourself healthy because, when your body is in good shape, that removes "friction" from your mental capacity so that it can focus on important things rather than annoying little problems with your physical wellness.
Joel Bennett

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

tredosoft.com/Multiple_IE

develop ie testing webdesign

shared by Joel Bennett on 08 Feb 07 - Cached
  • Joel Bennett on 08 Feb 07
     
    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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Good Math, Bad Math : The "C is Efficient" Language Fallacy - 0 views

scienceblogs.com/...c_is_efficient_language_fa.php

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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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ASP.NET Common authentication between 1.1 & 2.0? - 0 views

forums.asp.net/681295.aspx

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shared by Joel Bennett on 08 Feb 07 - Cached
  • decryption="3DES"
  • Joel Bennett on 08 Feb 07
     
    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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SharedView - Microsoft Connect - 0 views

connect.microsoft.com/...sitehome.aspx

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shared by Joel Bennett on 27 Aug 08 - Cached
  • Anyone can share, and the person sharing can give control to anyone else.
  • To start a session using this program, you must sign in using a Windows Live ID
  • Joel Bennett on 27 Aug 08
     
    Like Netmeeting: share, review, and update documents with multiple people in real-time. Anyone can share, and the person sharing can give control to anyone else.
  • Joel Bennett on 27 Aug 08
     
    A fast, easy way to share your screen or collaborate on documents with small (up to 15) groups of friends or coworkers...
Joel Bennett

Collapsible Panel - C# Controls - 0 views

www.codeproject.com/...TgXPPanel.asp

.netframework @public controls develop

shared by Joel Bennett on 08 Feb 07 - Cached
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The Code Project - Project Line Counter Add-In v2.10 for VS.NET and VC6 - Macros and Ad... - 0 views

www.codeproject.com/...linecount.asp

.netframework @public controls develop

shared by Joel Bennett on 08 Feb 07 - Cached
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Fabulous Adventures In Coding : The Stack Is An Implementation Detail, Part One - 0 views

blogs.msdn.com/...-an-implementation-detail.aspx

clr cli .NETGeneral c# memory allocation

shared by Matteo Spreafico on 14 Aug 09 - Cached
  • Almost every article I see that describes the difference between value types and reference types explains in (frequently incorrect) detail about what “the stack” is and how the major difference between value types and reference types is that value types go on the stack.
  • I find this characterization of a value type based on its implementation details rather than its observable characteristics to be both confusing and unfortunate. Surely the most relevant fact about value types is not the implementation detail of how they are allocated, but rather the by-design semantic meaning of “value type”, namely that they are always copied “by value”.
  • Of course, the simplistic statement I described is not even true. As the MSDN documentation correctly notes, value types are allocated on the stack sometimes. For example, the memory for an integer field in a class type is part of the class instance’s memory, which is allocated on the heap.
  • ...3 more annotations...
  • As long as the implementation maintains the semantics guaranteed by the specification, it can choose any strategy it likes for generating efficient code
  • That Windows typically does so, and that this one-meg array is an efficient place to store small amounts of short-lived data is great, but it’s not a requirement that an operating system provide such a structure, or that the jitter use it. The jitter could choose to put every local “on the heap” and live with the performance cost of doing so, as long as the value type semantics were maintained
  • I would only be making that choice if profiling data showed that there was a large, real-world-customer-impacting performance problem directly mitigated by using value types. Absent such data, I’d always make the choice of value type vs reference type based on whether the type is semantically representing a value or semantically a reference to something.
David Corking

Dr. Dobb's | Q&A: When Mobility and Open Source Collide | March 28, 2009 - 0 views

www.ddj.com/216300285

symbian Cellular phones PDA

shared by David Corking on 11 May 09 - Cached
  • The web browser is a good example, on a pc it may make sense to ask a user to find, click, type, and browse the web or look for a service. In a mobile, converged product, you need to help the user be present with the service even or especially when they are driving or have the product in a pocket or handbag, and requiring them to constantly select 'yes' or to type in forms etc. are real headaches for a consumer.
  • We will not provide a store front, but will help the community create multiple online stores from which they can generate revenue for themselves and the developer.
  • At the other end of the spectrum, you see hoards of teenagers in the U.S., Europe and Asia happily texting one handed, using predictive text.
    • David Corking
      David Corking on 11 May 09
       
      No: they do NOT use predictive text - we 40 somethings might - but the kids uset text speak. How does a kid text rom an iPhone in his pocket?
  • ...7 more annotations...
  • Focus on the whole experience, meaning you need to be inclusive of display sizes, input methods, and form factors when you design and develop your applications and services.
    • David Corking
      David Corking on 11 May 09
       
      How much time does a Symbian app developer have to put in to considering all the different Symbian phones on the market?
  • .Net CF
  • expanding this functionality with QT libraries, Adobe AIR technology
  • StyleTap has a Palm emulator that allows you to run thousands of Palm applications on Symbian products
  • Red Five Labs has a runtime for Symbian OS which ensures Microsoft .net applications can be fully supported.
  • many people around the world are not buying and cannot afford a PC.
  • The Symbian Foundation is helping to do this by ensuring we lower the barrier for entry for software developers.
  • David Corking on 11 May 09
     
    Really interesting interview with Symbian boss
David Corking

JavaScript as a Functional Language | Ajaxonomy | 2009 - 0 views

www.ajaxonomy.com/...cript-as-a-functional-language

Functional programming Lisp Web development

shared by David Corking on 09 Apr 09 - Cached
  • there is a little bit of hand-waving involved in calling JavaScript a functional language. JavaScript is not a side-effect free language, nor is it an expression-based language (i.e., it is not value-oriented, but rather variable-oriented). There is no tail call optimization in any of the current implementations, so recursion must be kept shallow. And the list goes on. Truth be told, JavaScript is really one of the first hybrid imperative-functional languages.
  • Higher-order functions allow us to do functional composition,
  • Since JavaScript does not have "overloaded" functions, this type of functionality is usually simulated using manipulation of the function's arguments. Currying comes in handy because it allows you to do this manipulation in a much cleaner and more modular way.
  • ...1 more annotation...
  • Closures have quite a few applications in real-world JavaScript: event binding, callbacks, sorting, mapping (in the classical Lisp sense), and many others. In more modern JavaScript programming, you can find them almost everywhere.
  • David Corking on 09 Apr 09
     
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Building Real Software: Lessons in Software Reliability, 2009-08-30 by Jim Bird - 11 views

swreflections.blogspot.com/...s-in-software-reliability.html

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  • Fabien Cadet on 16 Aug 11
     
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