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.

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

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.

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.

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.

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.

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

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.

Automated testing is the process of writing a program that tests another program. Writing tests is a bit more work than testing manually, but once you’ve done it, you gain a kind of superpower: it takes you only a few seconds to verify that your program still behaves properly in all the situations you wrote tests for.

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.

Though computers are deterministic machines—they always react the same way if given the same input—it is possible to have them produce numbers that appear random. To do that, the machine keeps some hidden value, and whenever you ask for a new random number, it performs complicated computations on this hidden value to create a new value.

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.

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.

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

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.

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

Visual Studio Express 2012 for Windows

DOM stands for Document Object Model, and it refers to the standardized list of web page elements that can be accessed and manipulated using JavaScript

Make it run, then make it right, then make it fast.

In object literal notation, an object is described as a set of comma-separated name/value pairs enclosed in curly braces ({}).

Logic. Rationality. Reasoning. Thought. Analysis. Calculation. Decision-making. All this is within the mind of a human being, correct? Humanity

Client-Side type

techno softwares malaysia hire php and java developers " "PHP Developers Job Description: 1. Understanding client requirements & functional specifications 2. Developing and maintaining dynamic websites and web applications 3. Ensuring foolproof performance of the deliverable 4. Coordinating with co-developers and other related departments 5. Sending regular updates about project status Desired Candidate Profile: 1. Must be proficient in PHP, MySQL, CSS, HTML, Javascript, AJAX, XML 2. Should have experience with Joomla, WordPress, Drupal, Magento. 3. Should have excellent written communication skills (English) 4. Must have capacity to work independently and also as a part of team 5. Must have dedication and commitment towards work. 6. Eligibility: (B.Tech/B.E) 7. Salary: Higher Salary based on Experience and Expertise)

When I’m loading a page from my computer, like we are in these exercises, what is my origin? A: A: Good question. In that case your origin is known as the “Local Files” origin, which

When you declare any kind of global variable or define a global function, it is stored as a property in the window object. So

An object named arguments is available in every function when that function is called. You

You can use arguments to create a function that accepts a variable number of arguments, or create a function that does different things depending on the number of arguments passed to it. Let’s

Note that the JSON format doesn’t work with methods (so you can’t include, say, a bark method in your JSON string), but it does work with all the primitive types, as well as objects and arrays.

Math is not a constructor, or even a function. It’s an object. As you know, Math is a built-in object that you can use to do things like get the value of pi (with Math.PI) or generate a random number (with Math.random). Think of Math as just like an object literal that has a bunch of useful properties and methods in it, built-in for you to use whenever you write JavaScript code. It just happens to have a capital first letter to let you know that it’s built-in to JavaScript.

When you call an object’s method, this is set to the object whose method was called. If the method is not found in that object, and is found in the prototype, that doesn’t change the value of this. this always refers to the original object — that is, the object whose method was called — even if the method is in the prototype. So,

You see, now that we have a prototype, if we add any methods to that prototype, even after we’ve already created dog objects, all dogs inheriting from the prototype immediately and automatically get this new behavior.

If you change any property in the prototype, it affects all the objects that inherit from that prototype, unless that object has overridden that property.

In fact, there’s a keyword in JavaScript named this, and that is exactly how you tell JavaScript you mean this object we’re in.

You’ve probably seen latitude and longitude specfied in both degrees/minutes/seconds, such as (47°38’34’’, 122°32’32’’), and in decimal values, such as (47.64, -122.54). With the Geolocation API we always use decimal values. If

Two references are equal only if they reference the same object

There are five falsey values in JavaScript: undefined is falsey. null is falsey. 0 is falsey. The empty string is falsey. NaN is falsey.

Now, when we have an environment that has a value for each of the free variables, we say that we’ve closed the function. And, when we take the function and the environment together, we say we have a closure.

Well, say you write a handler and it requires a lot of computation — that is, something that takes a long time to compute. As long as your handler is chugging along computing, I’m sitting around waiting until it’s done. Only then can I continue with the queue.

Web Workers have a global function named importScripts that you can use to import one or more JavaScript files into your worker. To

JavaScript doesn’t have a character type. So characters are returned as new strings containing one character.

concentrate on knowing what is falsey, and then everything else you can consider truthy. Let’s look at some examples of using these falsey values

A string is always a primitive unless you create it in a special way using an object constructor. We’ll talk about object constructors later. And you can always use the typeof operator on your variable to see if it is of type string or object.

an important thing to know about JavaScript: there’s one queue and one “thread of control,” meaning there is only one of me going through the events one at a time.

methods in objects are properties too. They just happen to have a function assigned to them.

An object literal is an instance of Object. Think

JavaScript doesn’t have a classical object-oriented model, where you create objects from classes. In fact, JavaScript doesn’t have classes at all. In JavaScript, objects inherit behavior from other objects, which we call prototypal inheritance, or inheritance based on prototypes.

Here’s the short story: functions are objects in JavaScript. In

in JavaScript just about everything is an object underneath, even

the constructor always has a prototype property. More

Also notice that longitude West and latitude South are represented by negative values.

If the two values have different types, try to convert them into the same type and then compare them

By lexical scope we mean that JavaScript’s rules for scoping are based purely on the structure of your code (not on some dynamic runtime properties). This means you can determine where a variable is defined by simply examining your code’s structure. Also

As of HTML5, you are allowed to use all numbers as an element id. As

Joe: What’s the target? Judy: Like I said, it’s the element that generated the event. Like if you click on a specific image, the target will be that image.

An expression is anything that evaluates to a value. 3+4

position: absolute” positions an element based on the position of its most closely positioned parent.

burgeoning

The nail in search of a hammer had found its match. Flash

We haven’t done much writing code, but we are reading and understanding code, and that can be just as good. So

Lexical scope means that we can determine the scope of a variable by reading our code.

Closures are a function along with a referencing environment.

Closures are often used to capture state for event handlers.

bolstered

JavaScript has a very powerful object model, but one that is a bit different than the status quo object-oriented language. Rather than the typical class-based object-oriented system, JavaScript instead opts for a more powerful prototype model, where objects can inherit and extend the behavior of other objects. What

When you pass zero to setTimeout, you’re asking JavaScript to run your timeout handler as soon as it possibly can — and this leads to your handler running as frequently as it possibly can.

Well, it’s a browser policy, and it says you can’t retrieve data from a domain that is different from the domain the page itself was served from. Say

JavaScript: When an event occurs, like the ones you’ve mentioned, that event is added to a queue. I don’t even look at it until I’ve finished whatever I’m working on. That way I do everything correctly and safely and efficiently.

You can extend your object at any time with new properties. To do this you just specify the new property and give it a value. For

When you delete a property, you’re not just deleting the value of the property, you’re deleting the property itself. And, if you try to use fido.dogYears after deleting it, it will evaluate to undefined.

JavaScript: Don’t judge me by my bad parts, learn the good stuff and stick with that!

Speaking activates a different part of the brain. If you’re trying to understand something, or increase your chance of remembering it later, say it out loud. Better

If you give it an index that is greater than or equal to the length of the string, it returns the empty string.

If I had a dime for every time I’ve heard that one”, thought Larry, knowing that spec-change-no-problem was a fantasy. “And

Q: Q: You said getElementsByTagName returns a list. Do you mean an array? A: A: It returns an object that you can treat like an array, but it’s actually an object called a NodeList. A NodeList is a collection of Nodes, which is just a technical name for the element objects that you see in the DOM tree. You

Two objects are equal only if the variables containing the object references point to the same object.

As it turns out, one of the things the new operator does behind the scenes when the object is created is to store information that allows it to determine, at any time, the constructor that created the object. And