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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
Fabien Cadet

book: Exercises in programming styles, by Chritina Videira Lopes - 10 views

tagide.com/EPSBook

book programming trainning

shared by Fabien Cadet on 12 May 15 - No Cached
  • Fabien Cadet on 12 May 15
     
    "In the 1940s, the French writer Raymond Queneau wrote a jewel of a book called Exercises in Style, featuring 99 renditions of the exact same story, each written in a different style. The story being fairly trivial and always the same, the book highlights form, rather than content; it illustrates how the decisions we make in telling a story affect the perception of that story. Inspired by Queneau, I decided to embark on the project of writing the exact same computational task in as many styles as I have come across over the years. Exercises in Programming Style (#EPSBook) features 33 renditions of a simple computational task -- counting the frequency of words in a given file. All renditions are written in Python. This book is a companion text for code that is publicly available in Github. Software developers with many years of experience may enjoy revisiting familiar programming styles in the broad context of this book and learning about styles that may not be part of their normal repertoire. This book can be used as a textbook for advanced programming courses in Computer Science and Software Engineering programs. Additional teaching materials, such as lecture slides and implementations of each style in other languages, are also available."
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alex gross

5 Great IDEs to Start Coding in the Cloud | Web.AppStorm - 5 views

web.appstorm.net/...s-to-start-coding-in-the-cloud

ide asp.net

shared by alex gross on 12 Jan 10 - Cached
  • alex gross on 12 Jan 10
     
    Cloud computing has started proceeding beyond the hype stage and into the beginning of mainstream adoption. Gartner had included cloud computing in their list of Top 10 Strategic Technologies for 2009. In this roundup, we will review some online Integrated Development Environments (IDEs) which are great examples of cloud programming. These solutions can [nearly] replace your desktop IDEs and code editors.
vikramsjn

Programming Proverbs - Computer Science Teacher - Thoughts and Information from Alfred ... - 0 views

blogs.msdn.com/...programming-proverbs.aspx

programming proverb computer science

shared by vikramsjn on 23 Jun 10 - Cached
  • Interesting comment about IntelliSense encouraging a bottom-up approach. I think that is true if you start with programming and not with design. What I mean by that is that some people create their design in code rather than working out the full design before starting to code. I think that if you create a design using a top down approach it takes longer to get to the building blocks. that is frustrating to many, especially students, but in the long run results in a much better design. With a complete design in place one does know what the little blocks of code will be at least from the standpoint of names and interfaces. Creating those little blocks early on in the programming is fine as long as the design is complete
  • vikramsjn on 23 Jun 10
     
    very good and useful list of properly arranged proverbs
Fabien Cadet

CodeMirror : In-browser code editing made bearable - 9 views

codemirror.net

JavaScript library web development code browser

shared by Fabien Cadet on 06 Oct 11 - Cached
  • Fabien Cadet on 06 Oct 11
     
    « CodeMirror is a JavaScript library that can be used to create a relatively pleasant editor interface for code-like content ― computer programs, HTML markup, and similar. »
john popu

free ebooks | ebooks free download - ebooksgalaxy - 0 views

ebooksgalaxy.com

computer science free ebooks codes

shared by john popu on 29 Jan 14 - No Cached
  • john popu on 29 Jan 14
     
    Computer science is the scientific and practical approach to computation and its applications. Free download computer science eBooks to broaden your knowledge and skills in different programming languages. Our computer science department will keep you up to date regarding latest eBooks, projects, assignments, presentations, notes, lectures etc. of computer science subjects. Time to face your future!
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.
vikramsjn

Code of Ethics - Association for Computing Machinery - 0 views

www.acm.org/code-of-ethics

ethics acm moral professional leadership programming reference

shared by vikramsjn on 12 Mar 10 - Cached
  • vikramsjn on 12 Mar 10
     
    "Contents & Guidelines 1. General Moral Imperatives. 2. More Specific Professional Responsibilities. 3. Organizational Leadership Imperatives. 4. Compliance with the Code. 5. Acknowledgments."
  • vikramsjn on 12 Mar 10
     
    must read for every coder - for his work and career
Michael Collins

Top 10 Ways to Teach Yourself to Code - 0 views

lifehacker.com/ch-yourself-to-code-1684250889

programming computer languages

shared by Michael Collins on 28 Apr 15 - No Cached
  • Michael Collins on 28 Apr 15
     
    Very interesting article from lonekat. I have been teaching myself how to program for a while now.
wolf hesse

The life of a computer programmer blog - Code Justin - Programmer Career - 0 views

codejustin.com

programmer

shared by wolf hesse on 29 Jun 09 - Cached
  • wolf hesse on 29 Jun 09
     
    A blog about everything dealing with my journey into computer programming. Outlining all the details of my programmer career, projects, and life.
vikramsjn

Programming Proverbs 20: Provide good documentation - Computer Science Teacher - Though... - 0 views

blogs.msdn.com/...rovide-good-documentation.aspx

programming documentation proverb

shared by vikramsjn on 22 Jun 10 - Cached
  • the minimum documentation for a piece of code is the list and description of: inputs - names, types and purposes outputs -  types being the most important piece algorithm descriptions
  • The old line is that the job is not done until the paperwork is done. For programming documentation is the paperwork.
  • My axim is write documentation ONLY when it hurts to not have it
omouse

Software Engineering Code of Ethics and Professional Practice - Association for Computi... - 0 views

www.acm.org/se-code

software code ethics programming develop Development Reference Software Testing Quality Assurance

shared by omouse on 08 Aug 10 - Cached
  • Approve software only if they have a well-founded belief that it is safe, meets specifications, passes appropriate tests, and does not diminish quality of life, diminish privacy or harm the environment. The ultimate effect of the work should be to the public good.
  • Not knowingly use software that is obtained or retained either illegally or unethically.
  • Ensure proper and achievable goals and objectives for any project on which they work or propose.
  • ...2 more annotations...
  • Ensure adequate testing, debugging, and review of software and related documents on which they work.
  • Ensure adequate documentation, including significant problems discovered and solutions adopted, for any project on which they work.
jackmcmahon4

Buy Verified Coinbase Account - 100% USA UK Coinbase - 0 views

realserviceit.com/...buy-verified-coinbase-account

development @public pas cher develop web Design programming Sac tools

shared by jackmcmahon4 on 06 Aug 23 - No Cached
  • jackmcmahon4 on 06 Aug 23
     
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    Buy Verified Coinbase Account Introduction Coinbase is a popular digital currency exchange and wallet service. It allows you to buy, sell and trade Bitcoin (BTC), Ethereum (ETH), Litecoin (LTC) and other digital currencies. Coinbase also provides trading services for several other cryptocurrencies, including Binance Coin (BIB) and ex protocol tokens (ZR). What is Coinbase? Coinbase is a cryptocurrency exchange. Founded in 2012, it's one of the most popular platforms for buying, selling and transferring digital currency. Buy Verified Coinbase Account With over 16 million users worldwide and over $20 billion in transactions processed each year (as of 2019), you can rest assured that your funds are safe with Coinbase. The company also boasts an 18-month history of standing behind its customers' accounts - something many other exchanges don't offer at all! Verified Coinbase Accounts for Sale Verified Coinbase Accounts for Sale Verified Coinbase Accounts are available for purchase. These accounts have been verified by the company, which means that they've passed rigorous checks and have achieved a high level of security. Buy Verified Coinbase Account The account holder can use the wallet to make transactions with other users, but also has access to some extra features such as buying/selling cryptocurrencies and sending money abroad via bank transfer or wire transfer. Why Should You Buy Verified Coinbase Account For Your Business? Buying a verified CoinBase account is actually beneficial for your business in many ways: firstly, it shows potential clients that you're legit; secondly it makes them feel safe when doing business with you; thirdly it protects any funds stored on their platform from hackers who may try stealing information from inside phishing attacks - these people would need several years worth of time spent training criminals just so they could hack into an unsuspecting user's computer system before stealing anything valuable therefrom! Bu
Traveller Spice

Windows Azure and Cloud Computing - 0 views

msdn.microsoft.com/...ee514245.aspx

programming cloud computing azure coding microsoft

shared by Traveller Spice on 04 Feb 10 - Cached
  • Traveller Spice on 04 Feb 10
     
    The feature-complete release of the Windows Azure Platform enables developers to easily build or migrate applications to the cloud. The newly announced Windows Server AppFabric and Windows Azure Platform enables you to use existing technology to improve scalability and performance in complex applications without having to learn a new skill set.  Get started by downloading the free Windows Azure Platform training kit.
Joel Bennett

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

scienceblogs.com/...c_is_efficient_language_fa.php

c++ develop languages rants reference

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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