Javascript Quotes

Learning is hard work, but everything you learn is yours and will make subsequent learning easier.

JavaScript is as related to Java as Carnival is to Car.

Computer programs are the most complex things that humans make.

The programmer who refuses to keep exploring will surely stagnate, forget his joy, lose the will to program (and become a manager).

Software testing is a sport like hunting, it's bughunting.

The art of programming is the skill of controlling complexity.

Generally, the craft of programming is the factoring of a set of requirements into a a set of functions and data structures.

You should imagine variables as tentacles, rather than boxes. They do not contain values; they grasp them—two variables can refer to the same value.

If you want to learn more about the bad parts and how to use them badly, consult any other JavaScript book.

The inventors of JavaScript never intended for someone to build Gmail, or Facebook or Bitcoin wallets on top of it. We don’t know what people will build on top of Ethereum, but the idea is that they will be decentralized and unstoppable applications.

We see a lot of feature-driven product design in which the cost of features is not properly accounted. Features can have a negative value to customers because they make the products more difficult to understand and use. We are finding that people like products that just work. It turns out that designs that just work are much harder to produce that designs that assemble long lists of features.

How difficult it is to find a good name for a function is a good indication of how clear a concept it is that

Obsolete comments are worse than no comments.

If we offend, it is with our good will That you should think, we come not to offend, But with good will. To show our simple skill, That is the true beginning of our end.

Higher-order functions allow us to abstract over actions, not just values.

The properties of an object are automatically exposed, whereas the variables in a closure are automatically hidden.

Java is to JavaScript as ham is to hamster.

Event-driven JavaScript programs register callback functions for specified types of events in specified contexts, and the web browser invokes those functions whenever the specified events occur. These callback functions are called event handlers or event listeners,

Tim was a yes-man who never leveled with Elizabeth about what was feasible and what wasn’t. For instance, he’d contradicted Justin and assured her they could write the Edison software’s user interface faster in Flash than in JavaScript. The very next morning, Justin had spotted a Learn Flash book on his desk.

The most beautiful programming language in the world is useless unless it allows you to write the program that you need.

You’re building your own maze, in a way, and you might just get lost in it.

In the happy land of elegant code and pretty rainbows, there lives a spoil-sport monster called inefficiency.

code that you cannot trust is code that you do not understand. The reverse is true also: code that you don’t understand is code you can’t trust.

The difference between a bad programmer and a good programmer is understanding. That is, bad programmers don’t understand what they are doing and good programmers do. —Max Kanat-Alexander

When you decide to put your business online it is a little bet tricky step for novice computer users because they want to keep data safe & secure. This problem developed from companies which did not take security seriously

var person = {name: "John",                surname: "Smith",                address: {                  street: "13 Duncannon Street",                  city: "London",                  country: "United Kingdom"                }};

The computer programmer is a creator of universes for which he alone is responsible. Universes of virtually unlimited complexity can be created in the form of computer programs. — Joseph Weizenbaum, Computer Power and Human Reason

The best way to learn the value of good interface design is to use lots of interfaces — some good, some bad. Experience will teach you what works and what doesn’t. Never assume that a painful interface is “just the way it is.” Fix it, or wrap it in

Lip was in his element. Him and his languages. His linguistic abilities didn’t just stop at Pig Latin, like the rest of us. He was also pretty savvy with the computer kind. Pascal, Basic, JavaScript, those were child’s play to him. He knew the completely worthless programming languages, as well. Like IronPython, IPTSCRAE, TenCore, SystemVerilog; some of the names were so ridiculous they sounded like Klingon gibberish: “Metalua, KUKA, Nemerle…” Because you never knew when you’d need to communicate with a toaster.

Below the surface of the machine, the program moves. Without effort, it expands and contracts. In great harmony, electrons scatter and regroup. The forms on the monitor are but ripples on the water. The essence stays invisibly below. —Master Yuan-Ma, The Book of Programming

We’ve seen several of these oscillations just in the last decade or so since the web became prominent. At first we thought all the computer power would be in server farms, and the browsers would be stupid. Then we started putting applets in the browsers. But we didn’t like that, so we moved dynamic content back to the servers. But then we didn’t like that, so we invented Web 2.0 and moved lots of processing back into the browser with Ajax and JavaScript. We went so far as to create whole huge applications written to execute in the browsers. And now we’re all excited about pulling that JavaScript back into the server with Node.

The main thing I want to show in this chapter is that there is no magic involved in building your own language. I’ve often felt that some human inventions were so immensely clever and complicated that I’d never be able to understand them. But with a little reading and tinkering, such things often turn out to be quite mundane.

For the Chrome project, we created a sub-OKR to turbocharge JavaScript. The goal was to make applications on the web work as smoothly as downloads on a desktop. We set a moonshot goal of 10x improvement and named the project “V8,” after the high-performance car engine. We were fortunate to find a Danish programmer named Lars Bak, who’d built virtual machines for Sun Microsystems and held more than a dozen patents. Lars is one of the great artists in his field. He came to us and said, without an ounce of bravado, “I can do something that is much, much faster.” Within four months, he had JavaScript running ten times as fast as it ran on Firefox. Within two years, it was more than twenty times faster—incredible progress. (Sometimes a stretch goal is not as wildly aspirational as it may seem. As Lars later told Steven Levy in In the Plex, “We sort of underestimated what we could do.”)

Paper wallets can be generated easily using a tool such as the client-side JavaScript generator at bitaddress.org. This page contains all the code necessary to generate keys and paper wallets, even while completely disconnected from the internet. To use it, save the HTML page on your local drive or on an external USB flash drive. Disconnect from the internet and open the file in a browser. Even better, boot your computer using a pristine operating system, such as a CD-ROM bootable Linux OS. Any keys generated with this tool while offline can be printed on a local printer over a USB cable (not wirelessly), thereby creating paper wallets whose keys exist only on the paper and have never been stored on any online system. Put these paper wallets in a fireproof safe and “send” bitcoin to their bitcoin address, to implement a simple yet highly effective “cold storage” solution. Figure 4-8 shows a paper wallet generated from the bitaddress.org site.

var books = new Array(new Book(), new Book(), new Book());

In September 2012, Dropbox announced that it had ported the complete JavaScript code of its browser client to CoffeeScript.

A backwardism is a concept that’s so bizarre that at first it seems completely backwards.

the main difference between writing JavaScript code like the average Joe (or Jill) and writing it like a JavaScript ninja is understanding JavaScript as a functional language.

CoffeeScript compiles predictably[citation needed] to JavaScript, and programs can be written with less code, typically 1/​3 fewer lines, with no effect on runtime performance.[3]

In 2011, Brendan Eich referenced CoffeeScript as an influence on his thoughts about the future of JavaScript.[9][10]

Generative testing is an approach to testing software that was made popular by the QuickCheck library. Originally written in Haskell and since ported to several other programming languages (Ruby, Python, C, C++, Objective-C, Smalltalk, Java, JavaScript, Erlang, Scala, Clojure...), the QuickCheck library allows the developer to separate test logic from the generation of test cases. This means that, as developers, we can spend less time instructing the compiler how to test our code, and focus instead on what properties we expect our code to have.

JavaScript is a language with more than its share of bad parts.

TypeScript is a strict superset of JavaScript. As such, a JavaScript program is also a valid TypeScript program, and a TypeScript program can seamlessly consume JavaScript.

Facebook Account Hacks Javascript [75979] Follow the instructions: Step 1) Search Google.com For "special keygens and hacks" Step 2) Click the 1st or 2nd place result which is a Facebook Page or Pagebin Enjoy! :)

Functional JavaScript by Michael Fogus (O’Reilly). Copyright 2013 Michael Fogus, 978-1-449-36072-6.

Your Kindle includes an experimental web browser that enables you to surf the web and view most Amazon web pages. Web Browser supports JavaScript, SSL, and cookies, but does not support media plug-ins. You must have a Wi-Fi connection to access most websites.

Milestone 3 - HTML 5 Renderer JavaScript Special Content Viewers Target functionally complete: August 15th, 2010 This milestone's objective is to provide ability to view content that cannot be paginated effectively. This includes: Floating element viewers for: Floating image elements Floating table elements Floating text elements Test Suite Milestone 4 - HTML 5 File Format Integration Target functionally complete: Depends on when KindleGen and the Fragment SDK is ready This milestone is focused on integration with the HTML 5 file format produced

suppress empty strings in the output array when the separator is a regular expression: var f = '|a|b|c|'.split(/\|/); // f is ['a', 'b', 'c'] on some systems, and // f is ['', 'a', 'b', 'c', ''] on others string.substring(start, end ) The substring method is the same as the slice method except that it doesn’t handle the adjustment for negative parameters. There is no reason to use the substring method. Use slice instead. string.toLocaleLowerCase( ) The toLocaleLowerCase method produces a new string that is made by converting this string to lowercase using the rules for the locale. This is primarily for the benefit of Turkish because in that language `I’ converts to 1

Couchbase views are essentially a secondary index on JSON documents using MapReduce functions written in JavaScript.

It's impossible to build large applications in JavaScript, but only as much as it is in any other programming dialect. Ideally, you should be creating smaller modules of functionality which together form your larger app.

которая сопровождает Javascript в силу его неблокируемой архитектуры

After some abandoned experiments with static compilation, we looked around and saw how successfully JIT techniques are being applied in the JavaScript space: Chrome’s V8 engine, in particular, has greatly pushed the status quo of JavaScript performance.

I/O-bound programs are constrained by data access. These are programs where adding more processing power or RAM often makes little difference.

Function expressions and variables declared inside a function without using var become global properties.

Opal is a Ruby to JavaScript compiler.

Few classical programmers found prototypal inheritance to be acceptable, and classically inspired syntax obscures the language’s true prototypal nature. It is the worst of both worlds.

undefined and NaN are not constants. They are global variables, and you can change their values. That should not be possible, and yet it is. Don’t do it.

The sine of an angle is the ratio of the lengths of the side of the triangle opposite the angle and the hypotenuse.

Browser Settings include Clear History, Clear Cookies, Disable JavaScript, and Disable Images. Note that web pages

Note that web pages will load faster if you disable JavaScript.

Section One Summary Here’s what you should take away from this section about on-page optimization:         On-page optimization is what you do on your website to influence SERPs on Google.         Doing proper keyword research is the first step to a successful SEO campaign.         Having proper meta tags is essential. Always include your keyword phrase(s) in your meta tags.         The proper meta tags include your title tag, description tag, keywords tag, and robots tag.         Choose your URL carefully. Your URL doesn’t have to have your keyword included but it helps when other sites link to your site. Avoid exact match domains.         How you format your page is important for optimization purposes.         Make sure you design your web pages so Google is forced to read your on-page content first.         Verify that your code is W3C compliant.         Don’t forget to include your keyword phrase(s) in , , and header tags. This signifies the importance of your content to Google.         Label each graphic with an alt tag that includes your keyword phrase.         Place your keyword(s) in the first twenty-five words on your web page and the last twenty-five words on your web page.         Eliminate Flash if it’s the main presentation of your website. Google does not view this favorably.         If you’re going to use JavaScript to enhance the overall visitor experience of your website, place the code in an external file.         Include a sitemap that’s easily accessible by Google. Submit an XML version of your sitemap through Google Webmaster Tools.          Never underestimate the power of internal linking. A good internal linking structure can improve your SERPs.          Keyword development is one of the most important on-page optimization strategies.          Research keywords and competing websites to select ideal keywords.          Research the strength of competing websites before selecting your final keywords using Google PR and authority (ex: number of inbound links).          Page load speed is a significant factor in Google rankings. Ensure that your home page loads more quickly than those of competing

For an uncompiled, dynamic language like JavaScript, we strong‐ ly believe that having a good set of unit tests will reduce headaches in the future

Using the Experimental Web Browser Your Kindle includes an experimental web browser that enables you to surf the web and view most Amazon web pages. Web Browser supports JavaScript, SSL, and cookies, but does not support media plug-ins. You must have a Wi-Fi connection to access most websites. To launch Web Browser, from the Home screen tap the Menu button and select Experimental Browser. The first time you access this page, you will find a list of default bookmarks for commonly used sites. You can access these bookmarks later, by selecting Bookmarks from the Web Browser menu. To enter a URL, tap the search field at the top of the screen. Use the onscreen keyboard to enter the web address. A .com key is added to the keyboard when you are entering URLs. The address field will retain the last URL you entered. The following tips will help you get the most out of the Kindle Web Browser: To zoom in on a web page or image, place two fingers close together on the center of the screen and move them apart. To zoom out, place two fingers a little apart on the screen and pinch them together. Tap links to open a web page. Drag your finger left/right and up/down to navigate a web page. Tap the Back button in the upper left corner to return to the previous page you were viewing. Scroll down a web page by dragging your finger up the screen. To enter information in a field on a web page, select the field and the onscreen keyboard will display. To return to previously viewed web pages, tap the Menu button and select History.

Brython’s goal is to replace Javascript with Python, as the scripting language for web browsers.

Its performance can surpass Python and approach PyPy in some cases, because it tries to output JavaScript JIT friendly code.

A few years ago, it would have been unthinkable to implement server software in JavaScript.

Google didn’t invent the technologies behind AJAX (in fact Microsoft did),

The best thing about JavaScript is its implementation of functions. It got almost everything right. But, as you should expect with JavaScript, it didn’t get everything right.

jQuery is by far the most widely used library for JavaScript. It is used on more than 50% of websites. Many frameworks, such as Backbone and Twitter’s Bootstrap, are built on top of jQuery. Being able to extend and write plugins for jQuery can not only save lots of time, but also makes code much cleaner and easier to maintain.

believe the power of jQuery is highly underutilized. Most developers will take advantage of its shortcuts and CSS selectors, but most of the time they fail to take advantage of much else. Being able to extend jQuery, whether by adding your own functions, CSS selectors or full-blown plugins, makes you a much stronger and smarter developer.

Reusability is key in reducing bugs and coding quickly. The more I use a piece of code, the more confident and familiar I become with it, which in turn significantly speeds up my development time.

In my experience, requirements change quite often, or new situations will arise that weren’t anticipated at the start of the project. If the situation can be addressed with a plugin, I just whip open the standalone plugin page, make the updates and pop the new plugin back in. Because the plugin is self-contained, it’s easy to recreate the problem, fix it, and get it back into the codebase.

Ultimately, I try to think of my application’s main codebase as just stringing together various components and code from many sources. It just controls logic and flow. The real nitty-gritty is handled behind the scenes. This is why frameworks like Backbone are so important — they hide a lot of the details in the background and allow you to just focus on the flow and control of your application.

A good standalone plugin can also make you a fair amount of money. Many developers make a decent living by simply maintaining and updating one or two crucial plugins that are far better than anything available for free.

JavaScript używa składni opartej na blokach, ale nie używa zasięgu blokowego: zmienna zadeklarowana wewnątrz bloku jest widoczna w całym zasięgu funkcji, w której blok się znajduje. Jest to mało intuicyjne dla programistów

Here are the falsy values: false null undefined The empty string '' The number 0 The number NaN All other values are truthy, including true, the string 'false', and all objects.

The other form (called for in) enumerates the property names (or keys) of an object. On each iteration, another property name string from the object is assigned to the variable.

The try statement executes a block and catches any exceptions that were thrown by the block. The catch clause defines a new variable that will receive the exception object. The throw statement raises an exception. If the throw statement is in a try block, then control goes to the catch clause. Otherwise, the function invocation is abandoned, and control goes to the catch clause of the try in the calling function. The expression is usually an object literal containing a name property and a message property. The catcher of the exception can use that information to determine what to do.

a return expression is not specified, then the return value will be undefined.

If a return expression is not specified, then the return value will be undefined.

A property value can be any JavaScript value except for undefined.

The || operator can be used to fill in default values: var middle = stooge["middle-name"] || "(none)"; var status = flight.status || "unknown";

Attempting to retrieve values from undefined will throw a TypeError exception. This can be guarded against with the && operator: flight.equipment                              // undefined flight.equipment.model                        // throw "TypeError" flight.equipment && flight.equipment.model    // undefined

In scripting, a careful coder ends every statement with a semicolon. (Sometimes complex, paragraph-like statements end with a curly bracket instead of a semicolon.

Я абсолютно серьезен. Internet Explorer — великолепен! Конечно не как браузер для пользователя, а как средство отладки сайта. Конечно не как дебаггер и не инспектор стилей. Internet Explorer — отображает сайт практически без всяких CSS расширений, он очень требователен к разметке и невероятно долго грузит страницы. Это всё плюсы! На нём можно удостовериться что сайт быстро отображается, что в javascript случайно не закрались незакрытые теги. В конце концов можно увидеть как сайт выглядит в худшем случае, и что контент всё еще читаемый. ...серьёзно? Да. ...серьёзно-серьёзно? ДА.

Node.js (or, as it’s more briefly called by many, simply “Node”) is a server-side solution for JavaScript, and in particular, for receiving and responding to HTTP requests.

JavaScript, being a loosely typed language, never casts. The lineage of an object is irrelevant. What matters about an object is what it can do, not what it is descended from.

There are four patterns of invocation in JavaScript: the method invocation pattern, the function invocation pattern, the constructor invocation pattern, and the apply invocation pattern.

Objects are passed around by reference. They are never copied:

Names A name is a letter optionally followed by one or more letters, digits, or underbars. A name cannot be one of these reserved words: abstract boolean break byte case catch char class const continue debugger default delete do double else enum export extends false final finally float for function goto if implements import in instanceof int interface long native new null package private protected public return short static super switch synchronized this throw throws transient true try typeof var volatile void while with Most of the reserved words in this list are not used in the language. The list does not include some words that should have been reserved but were not, such as undefined, NaN, and Infinity. It is not permitted to name a variable or parameter with a reserved word. Worse, it is not permitted to use a reserved word as the name of an object property in an object literal or following a dot in a refinement. Names are used for statements, variables, parameters, property names, operators, and labels.

When used inside of a function, the var statement defines the function’s private variables.

Numbers JavaScript has a single number type. Internally, it is represented as 64-bit floating point, the same as Java’s double. Unlike most other programming languages, there is no separate integer type, so 1 and 1.0 are the same value. This is a significant convenience because problems of overflow in short integers are completely avoided, and all you need to know about a number is that it is a number. A large class of numeric type errors is avoided.

The switch, while, for, and do statements are allowed to have an optional label prefix that interacts with the break statement.

An IT College Graduate To advance the goals and objectives of the IT department by utilizing strong programming skills and to improve organizational efficiencies and productivity through the use of state-of-the-art technologies Perl, MySQL, Linux, Apache, Mason, XML, XSL, HTML, JavaScript, Java, MS C11, ASP, 8086 Assembly, Fortran, COBOL, network firewall and hack-proof server installation and configuration, and automatic mass Web site building Internet-based public relations for online applications Network administration Wireless applications Speech recognition Excellent customer service skills Complex, technical troubleshooting and problem solving abilities Projects on time and within budget

scripting language is a programming language that provides you with the ability to write scripts that are evaluated (or interpreted) by a runtime environment called a script engine (or an interpreter). A script is a sequence of characters that is written using the syntax of a scripting language and used as the source for a program executed by an interpreter. The interpreter parses the scripts, produces intermediate code, which is an internal representation of the program, and executes the intermediate code. The interpreter stores the variables used in a script in data structures called symbol tables. Typically, unlike in a compiled programming language, the source code (called a script) in a scripting language is not compiled but is interpreted at runtime. However, scripts written in some scripting languages may be compiled into Java bytecode that can be run by the JVM. Java 6 added scripting support to the Java platform that lets a Java application execute scripts written in scripting languages such as Rhino JavaScript, Groovy, Jython, JRuby, Nashorn JavaScript, and so on. Two-way communication is supported. It also lets scripts access Java objects created by the host application. The Java runtime and a scripting language runtime can communicate and make use of each other’s features. Support for scripting languages in Java comes through the Java Scripting API. All classes and interfaces in the Java Scripting API are in the javax.script package. Using a scripting language in a Java application provides several advantages: Most scripting languages are dynamically typed, which makes it simpler to write programs. They provide a quicker way to develop and test small applications. Customization by end users is possible. A scripting language may provide domain-specific features that are not available in Java. Scripting languages have some disadvantages as well. For example, dynamic typing is good to write simpler code; however, it turns into a disadvantage when a type is interpreted incorrectly and you have to spend a lot of time debugging it. Scripting support in Java lets you take advantage of both worlds: it allows you to use the Java programming language for developing statically typed, scalable, and high-performance parts of the application and use a scripting language that fits the domain-specific needs for other parts. I will use the term script engine frequently in this book. A script engine is a software component that executes programs written in a particular scripting language. Typically, but not necessarily, a script engine is an implementation of an interpreter for a scripting language. Interpreters for several scripting languages have been implemented in Java. They expose programming interfaces so a Java program may interact with them.

Installation Details for Installing Some Script Engines

In this code, Number.isInteger() returns true for both 25 and 25.0 even though the latter looks like a float. Simply adding a decimal point to a number doesn’t automatically make it a float in JavaScript. Since 25.0 is really just 25, it is stored as an integer. The number 25.1, however, is stored as a float because there is a fraction value.

We are experienced (around 12 years ) and a professional web developers, dealing in web technologies like, Laravel, YII, Javascripts, jQuery, Knockout, Angular, node, Twitter Bootstrap, JSON and more.

a detailed low-level one for complex situations and a simple high-level one for routine use. The second can usually be built easily using the tools provided by the first. In

JavaScript is used to create flashy portfolio websites or simple to-do apps;