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longchamppas

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Des centaines de personnes sont toujours portées manquantes. "Les opérations de sauvetage se poursuivent, mais la priorité est maintenant d'apporter de l'aide" aux survivants qui n'ont pas encore r...

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Une fin de non-recevoir, assortie de quelques ouvertures. C'est ainsi que l'on pourrait résumer la réponse de la Commission européenne donnée, mercredi 3 juin, à une initiative citoyenne européenne...

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Bien que de nombreuses initiatives ont été entreprises pour lutter contre le manque d'accès à l'eau potable dans certaines régions, le problème reste préoccupant. Un nouveau dispositif innovant pou...

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La tortue, qui souffrait d'un poumon perforé, avait été pourtant operée... Une jeune tortue verte de 68 kg est décédée dimanche à La Réunion, après avoir été blessée par une hélice de bateau, révè...

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started by longchamppas on 25 Aug 15 no follow-up yet
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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

The Graphing Calculator Story - 0 views

www.nucalc.com/Story

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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.
omouse

Shedding Bikes: Common Programmer Health Problems - 0 views

sheddingbikes.com/...1281257293.html

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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

Windows Vista Deployment Step by Step Guide - 0 views

technet2.microsoft.com/...7f7-a10d-e23dd53bc3fa1033.mspx

@public deployment imagex imaging vista wim

shared by Joel Bennett on 18 Oct 07 - Cached
  • [ExclusionList]ntfs.loghiberfil.syspagefile.sys"System Volume Information"RECYCLERWindows\CSC[CompressionExclusionList]*.mp3*.zip*.cab\WINDOWS\inf\*.pnf
    • Joel Bennett
      Joel Bennett on 18 Oct 07
       
      The wimscript listed in step 3 is the default anyway, so unecessary if you're not going to add to it.
  • Oscdimg -n –bc:\winpe_x86\etfsboot.com c:\winpe_x86\ISO c:\winpe_x86\winpe_x86.iso
    • Joel Bennett
      Joel Bennett on 18 Oct 07
       
      This command in step 5 is incorrect, the etfsboot.com file is in C:\WinPE_x86\ISO\boot if you follow the rest of the instructions here, so the command should be: Oscdimg -n -bC:\WinPE_x86\ISO\boot\etfsboot.com c:\winpe_x86\ISO c:\winpe_x86\winpe_x86.iso
  • Joel Bennett on 18 Oct 07
     
    A step-by-step for how to set up and capture an image using Windows PE and ImageX that you can deploy onto other PCs.
Fabien Cadet

Software Engineering: Dead? @ Coding Horror - 0 views

www.codinghorror.com/...001288.html

software engineering

shared by Fabien Cadet on 19 Jul 09 - Cached
  • The guys and gals who show up every day eager to hone their craft, who are passionate about building stuff that matters to them, and perhaps in some small way, to the rest of the world -- those are the people and projects that will ultimately succeed.
  • Everything else is just noise.
  • If you want to move your project forward, the only reliable way to do that is to cultivate a deep sense of software craftsmanship and professionalism around it.
  • Fabien Cadet on 19 Jul 09
     
    « I'm gradually coming to the conclusion that software engineering is an idea whose time has come and gone. Software development is and always will be somewhat experimental. The actual software construction isn't necessarily experimental, but its conception is. And this is where our focus ought to be. It's where our focus always ought to have been. » __ Tom DeMarco
Fabien Cadet

You can always do less [2010-01-14] - (37signals) - 3 views

37signals.com/...2106-you-can-always-do-less

development pragmatic requirements

shared by Fabien Cadet on 17 Jan 10 - Cached
  • The hardest part about making good software that ships on time is knowing what and when to sacrifice.
  • We mistake what we said we’ll do with what must be done.
  • you can always do less.
  • ...2 more annotations...
  • What stops most people from doing less is the fear of failure. The misconception that if you don’t get it all done, the rest is worth nothing at all.
  • For every 1 day estimates of a task, there’s a simpler version of that you can do in 3 hours, and an even simpler still you can do in 30 minutes.
  • Fabien Cadet on 17 Jan 10
     
    « We mistake what we said we'll do with what must be done. » « For every 1 day estimates of a task, there's a simpler version of that you can do in 3 hours, and an even simpler still you can do in 30 minutes. »
Rem PC

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started by Rem PC on 29 Sep 11 no follow-up yet
Rem PC

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