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See all details. Next page. Customers who viewed this item also viewed. Page 1 of 1 Start over Page 1 of 1. Kathy Sierra. Elisabeth Robson. Paul Barry. Eric Freeman.
Laura Lemay. Special offers and product promotions 7. Minimum purchase value INR Here's how 7. Please check 'EMI options' above for more details. Sign up for free Here's how. About the Author Michael Morrison is a toy inventor, writer, developer, and author of a variety of books. Customer reviews.
How are ratings calculated? Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyses reviews to verify trustworthiness. Top reviews Most recent Top reviews. Top reviews from India. There was a problem filtering reviews right now. Please try again later. Verified Purchase. So please see it before buying HTML book. Eric is now devoting his time to WickedlySmart, a startup he co-created with Elisabeth.
By training, Eric is a computer scientist, having studied with industry luminary David Gelernter during his Ph. His dissertation is credited as the seminal work in alternatives to the desktop metaphor, and also as the first implementation of activity streams, a concept he and Dr.
Adding the hit detection code 57 Provide some post-game analysis 58 And that completes the logic! Get ready for your first superpower. Functions give you the. Say, all the items in a shopping cart, or all the songs in a playlist, or a set of stars and their apparent magnitude, or an entire product catalog. For that we need a little more ummph. Meanwhile, back at Bubbles-R-Us Creating an array from scratch and adding to it And the winners are Well, the time has come to leave this boring procedural town behind to create some.
Returning functions from functions Writing the flight attendant drink order code The flight attendant drink order code: a different approach Taking orders with first class functions In this chapter we take it further; we get hard-core. Taking a look at the other side of functions It depends How nesting affects scope A little review of lexical scope Where things get interesting with lexical scope Using closures to implement a magic counter Looking behind the curtain Wait a sec Maybe we can get a leg up on her yet.
Darn it! With constructors we can create objects much more easily, and we can create objects that all adhere to the same design blueprint —meaning. Creating objects with object literals Using conventions for objects Introducing Object Constructors How to create a Constructor Learning how to create objects was just the beginning. We need more ways to create relationships between objects and to share code among them. And, we need ways to extend and enhance existing objects.
It all fit, but nobody could read it. So we threw most of it away, and kept the best bits for this Top Ten appendix. This really is the end of the book. Except for the index, of course a must-read!
Are you afraid to try something different? Would you rather have a root canal than mix stripes with plaid? Your brain craves novelty. It was built that way, and it helps you stay alive. You just never know.
So what does your brain do with all the routine, ordinary, normal things you encounter? What happens inside your head and body? Getting ready for an exam.
If you really want to learn, and you want to learn more quickly and more deeply, pay attention to how you pay attention. Think about how you think. Learn how you learn. Most of us did not take courses on metacognition or learning theory when we were growing up. We were expected to learn, but rarely taught how to learn. And you want to remember what you read, and be able to apply it. To get the most from this book, or any book or learning experience, take responsibility for your brain.
Your brain on this content. Crucial to your well-being. As important as a tiger. The slow way is about sheer repetition.
You obviously know that you are. The faster way is to do anything that increases brain activity, especially different. For example, studies show that putting words within the pictures they describe as opposed to somewhere else in the page, like a caption or in the body text causes your brain to try to make sense of how the words and picture relate, and this causes more neurons to fire. On the other hand, if the writing style is formal and dry, your brain perceives it the same way you experience being lectured to while sitting in a roomful of passive attendees.
No need to stay awake. We used pictures , because your brain is tuned for visuals, not text. And when text and pictures work together, we embedded the text in the pictures because your brain works more effectively when the text is. We used redundancy , saying the same thing in different ways and with different media types, and multiple senses , to increase the chance that the content gets coded into more than one area of your brain.
We used concepts and pictures in unexpected ways because your brain is tuned for novelty, and we used pictures and ideas with at least some emotional content , because your brain is tuned to pay attention to the biochemistry of emotions. That which causes you to feel something is more likely to be remembered, even if that feeling is nothing more than a little humor ,. We included more than activities , because your brain is tuned to learn and remember more when you do things than when you read about things.
We used multiple learning styles , because you might prefer step-by-step procedures, while someone else wants to understand the big picture first, while someone else just wants to see a code example. But regardless of your own learning preference, everyone benefits from seeing the same content represented in multiple ways. We include content for both sides of your brain , because the more of your brain you engage, the more likely you are to learn and remember, and the longer you can stay focused.
Since working one side of the brain often means giving the other side a chance to rest, you can be more productive at learning for a longer period of time.
We used people. In stories, examples, pictures, etc. And your brain pays more attention to people than it does to things. So, we did our part. The rest is up to you. Try new things. Stop and think. Imagine that someone really is asking the question. The more deeply you force your brain to think, the better chance you have of learning and remembering. We put them in, but if we did them for you, that would be like having someone else do your workouts for you.
Use a pencil. That means all of them. Part of the learning especially the transfer to long-term memory happens after you put the book down. Your brain needs time on its own, to do more processing. If you put in something new during that processing-time, some of what you just learned will be lost. Speaking activates a different part of the brain.
Programming requires a different way of thinking. Programming is logical, at times very abstract, and requires you to think in an algorithmic way. That way, these new programming concepts will really sink in. One distinct difference in a Head First book is that we want you to really get it. This book has been more carefully reviewed than any of our previous books.
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We need to save that precious bandwidth for important things like stunt videos and cute pet pictures. Well, without the mess However; you get full access to the HTML ingredients that go into a web page, and more importantly, you have the ability to alter the recipe of the page. You end up with arrays that can sort themselves, strings that can search themselves, and scripts that can grow fur and howl at the moon!
The information associated with a house search must all be stored within the script that performs the calculations. Scripts use stored data to carry out calculations and remember information about the user.
A variable changes throughout the course of a script, while a constant never changes its value. Variable data can change—constant data is fixed. Constant Land area of 3. Variable Population of million people—a variable since the U.
Sunrise at am—a variable since the sunrise changes every day. URL of web page is www. What other information types could involve both variables and constants? Variable: Constant: When it comes to storing data, I offer the most in flexibility. You can change my value all you want.
And I call that flip-flopping! I say pick a value and stick to it. For example, a rocket launch countdown has to change as it counts down from 10 to 1. Deal with that! How do you think that rocket ever got to the launch pad? Because someone was smart enough to make the launch date a constant. Yeah, sure, whatever.
For example, the name pageHits gives you a pretty good clue as to what kind of data that variable stores. Initial value The equals sign connects the variable name to its initial value. Unlike its blank counterpart, an initialized variable is immediately ready to be used Assign the value to the variable. Now the variable contains numeric data. Give it a name. Specify its value. Remember data types? Another thing this line of script does is assign the data type of the variable automatically.
The name of the constant. The biggest difference between creating a constant and a variable is you have to use the const keyword instead of var. This data will never, ever, ever change Constants are handy for storing information that you might directly code in a script, like a sales tax rate. Instead of using number like 0. And if you ever need to change the value of the constant in the script, you can make the change in one place—where the constant is defined—instead of trying to find each time it appears in your script, which could get really complicated.
This helps eliminate the risk of accidentally accessing uninitialized data. Q: Is there any trick to knowing when to use a variable and when to use a constant? Script data can usually be represented by one of the three basic data types: text, number, or boolean.
Instead of duplicating the text or number over and over, create a constant for it and use that instead. Then if you ever need to adjust or change the value, you can do it in one place in your code. Q: What happens to script data when a web page is reloaded?
A: Script data gets reset to its initial values, as if the script had never been run before. In other words, refreshing a web page has the same effect on the script as if the script was being run for the first time.
Of course, there are times when a simple x does the job—not every piece of data in a script has a purpose that is easily described. Sheriff J. Justice, dedicated lawman.
Identifiers should be descriptive so that data is easily identifiable, not to mention legal Variables usually use lower camel case, in which the first word is all lowercase, but additional words are mixed-case. NumCakeDonuts Better The first letter of each word except the first is capitalized.
Bonus points: identify each data type. His idea is just-in-time donuts, where you place an order online and enter a specific pick-up time, and have a hot order of donuts waiting for you at the precise pick-up time. Your job is to make sure the user enters the required data, as well as calculate the tax and order total. This online ordering system for making hot donuts is going to ROCK! DB x 12 The Donut Blaster Hot and on time! The subtotal and total are calculated on the fly as the data is entered so that the user gets immediate feedback on the total price.
What would you name them? As soon as a user enters a number of donuts, the on-the-fly calculations immediately go haywire.
Since the data entered by the user looks OK, there must be something wrong with the constants. This code submits the order to the server and confirms the order with the user. The order is updated when either number of donuts changes. The order is submitted when the Place Order button is clicked. Always initialize constants when you create them. This is a big problem. Same deal with undefined—it indicates a lack of data. You have no messages.
A piece of data is undefined when it has no value. In other words, you treated a missing value as a number Not a number! The whole point of identifiers is to serve as a unique name that you can use to identify a piece of information in a script. You do this by making sure identifiers within your script code are all unique. Q: Does every identifier I create have to be unique, or unique only in a specific script?
However, keep in mind that scripts for big web applications can get quite large, spread across lots of files. In this case, it becomes more challenging to ensure uniqueness among all identifiers. What gives? Lower camel case applies to variables and functions, and is the same as camel case, except the first letter in the identifier is lowercase. So camel case means you would name an object Donut, while lower camel case means you would name a function getDonut and a variable numDonuts.
Q: A: Are text and boolean data considered NaN? But in reality, no. You typically only encounter NaN when performing calculations that expect numbers but for some reason are given non-numeric data to work with. Instead of empty boxes, now there are donuts everywhere—every order is somehow getting overcalculated. Duncan is getting overwhelmed with complaints of donut overload and pastry gouging. The customer only ordered 9 donuts but he somehow ended up getting a lot more. What could be wrong with how the donut quantity data is being handled?
Even something as simple as adding two pieces of information can yield very different results depending upon the type of data involved. Knowing that strings of text are added differently than numbers, what do you think happens when an attempt is made to add two textual numbers?
Be sure to convert strings to numbers before adding them if your intent is numeric addition. In these cases, you need to convert the string to a number before performing any numeric operations on it.
Surprise, surprise, the result is Not a Number. Take a closer look at the just-in-time donut order form. We should be able to figure out why so many donuts are being accidentally ordered More donuts are be charged for than aring actually being ordereed.