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.

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

Computer programs are the most complex things that humans make.

The art of programming is the skill of controlling complexity.

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

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.

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

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.

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.

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

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

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.

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.

there is nothing before the word "function", so it's a statement

Declaration is reserving a space in a memory.

The YDKJS series is dedicated to the proposition that all JS developers can and should learn all of the parts of this great language. No person’s opinion, no framework’s assumptions, and no project’s deadline should be the excuse for why you never learn and deeply understand JavaScript.

Before moving on, the most astute readers may have noted that I used strings to represent the prices. Why not numbers? This is because numbers in JavaScript are floating points; in other words, they are not accurate because the number of decimal digits "floats.

slide

Values of type string, number, and Boolean are not objects, and though the language doesn’t complain if you try to set new properties on them, it doesn’t actually store those properties. As mentioned earlier, such values are immutable and cannot be changed. But these types do have built-in properties. Every string value has a number of methods.

It can be useful for a function to accept any number of arguments. For example, Math.max computes the maximum of all the arguments it is given. To write such a function, you put three dots before the function’s last parameter, like this: function max(... numbers)

You can use a similar three-dot notation to call a function with an array of arguments. let numbers = [5, 1, 7]; console.log( max(... numbers)); // → 7 This “spreads” out the array into the function call, passing its elements as separate arguments. It is possible to include an array like that along with other arguments, as in max( 9, ... numbers, 2).

As we’ve seen, Math is a grab bag of number-related utility functions, such as Math.max (maximum), Math.min (minimum), and Math.sqrt (square root).

We defined square with only one parameter. Yet when we call it with three, the language doesn’t complain. It ignores the extra arguments and computes the square of the first one.

If you write an = operator after a parameter, followed by an expression, the value of that expression will replace the argument when it is not given.

we will see a way in which a function body can get at the whole list of arguments it was passed (see “Rest Parameters” on page 74). This is helpful because it makes it possible for a function to accept any number of arguments.

Normally, when you forget to put let in front of your binding, as with counter in the example, JavaScript quietly creates a global binding and uses that. In strict mode, an error is reported instead.

JavaScript can be made a little stricter by enabling strict mode. This is done by putting the string "use strict" at the top of a file or a function body.

Strict mode does a few more things. It disallows giving a function multiple parameters with the same name and removes certain problematic language features entirely (such as the with statement, which is so wrong it is not further discussed in this book).

There are several JavaScript dialects that add types to the language and check them. The most popular one is called TypeScript. If you are interested in adding more rigor to your programs, I recommend you give it a try.

So there is another feature that try statements have. They may be followed by a finally block either instead of or in addition to a catch block. A finally block says “no matter what happens, run this code after trying to run the code in the try block.

The for (;;) construct is a way to intentionally create a loop that doesn’t terminate on its own.

JavaScript’s global namespace is also exposed as a global object, which is accessible at the top of a program as the initial value of the this keyword. In web browsers, the global object is also bound to the global window variable. Adding or modifying global variables automatically updates the global object: this.foo; // undefined foo = "global foo"; this.foo; // "global foo

In JavaScript, most I/ O operations are provided through asynchronous, or nonblocking APIs. Instead of blocking a thread on a result, the programmer provides a callback (see Item 19) for the system to invoke once the input arrives:

There’s no deep reason to have both arrow functions and function expressions in the language. Apart from a minor detail, which we’ll discuss in Chapter 6, they do the same thing. Arrow functions were added in 2015, mostly to make it possible to write small function expressions in a less verbose way.

The preceding code works, even though the function is defined below the code that uses it. Function declarations are not part of the regular topto-bottom flow of control. They are conceptually moved to the top of their scope and can be used by all the code in that scope. This is sometimes useful because it offers the freedom to order code in a way that seems meaningful, without worrying about having to define all functions before they are used.

Such a prototype object will itself have a prototype, often Object .prototype, so that it still indirectly provides methods like toString.

Web Design Services - TRIRID Web Application Development technologies include PHP, Ajax, .Net, WordPress, HTML, JavaScript, Bootstrap, Joomla, etc. PHP language is considered one of the most popular & most widely accepted open source web development technology. PHP development is gaining ground in the technology market. Web development using these technologies is considered to offer the most efficient website solutions. The open source based products and tools are regularly studied, used, implemented and deployed by TRIRID. TRIRID can develop solutions like Community sites, CMS, e-Commerce applications and custom web applications based on PHP and MySQL. To Know More About Web Application Development in Ahmedabad, Web Designing Service In Ahmedabad, Web designing in Wordpress, Web Design in HTML Call now 8980010210

Services Provided by TRIRID Welcome to TRIRID. Services Provided By TRIRID Mobile Application Development Web Application Development Custom Software Development Database Management Wordpress / PHP Search Engine Optimization Mobile Application Development We offer various Mobile Application Development services for most major platforms like Android, iPhone, .Net etc. At Tririd we develop customized applications considering the industry standards which meet all the customers requirements. Web Application Development Web Application Development technologies include PHP, Ajax, .Net, WordPress, HTML, JavaScript, Bootstrap, Joomla, etc. PHP language is considered one of the most popular & most widely accepted open source web development technology. PHP development is gaining ground in the technology market. Web development using these technologies is considered to offer the most efficient website solutions. The open source based products and tools are regularly studied, used, implemented and deployed by TRIRID. Custom Software Development TRIRID has incredible mastery in Windows Apps Development platform working on the .NET framework. We have done bunch of work for some companies and helping them to migrate to a new generation windows based solution. We at TRIRID absolutely comprehend your custom needs necessities and work in giving high caliber and adaptable web API services for your web presence. TRIRID offers a range of utility software packages to meet and assortment of correspondence needs while including peripherals. We offer development for utility software like plugin play, temperature controller observation or embedding solutions. Database Management In any organization data is the main foundation of information, knowledge and ultimately the wisdom for correct decisions and actions. On the off chance that the data is important, finished, exact, auspicious, steady, significant and usable, at that point it will doubtlessly help in the development of the organization If not, it can turn out to be a useless and even harmful resource. Our team of database experts analyse your database and find out what causes the performance issues and then either suggest or settle the arrangement ourselves. We provide optimization for fast processing better memory management and data security. Wordpress / PHP WordPress, based on MySQL and PHP, is an open source content management system and blogging tool. TRIRID have years of experience in offering different Web design and Web development solutions to our clients and we specialize in WordPress website development. Our capable team of WordPress designers offers all the essential services backed by the stat-of-the-art technology tools. PHP is perhaps the most effective and powerful programming language used to create dynamic sites and applications. TRIRID has extensive knowledge and experience of giving web developing services using this popular programming language. Search Engine Optimization SEO stands for search engine optimization. Search engine optimization is a methodology of strategies, techniques and tactics used to increase the amount of visitors to a website by obtaining a high-ranking placement in the search results page of a search engine (SERP) — including Google, Bing, Yahoo and other search engines. Call now 8980010210

A prototype is another object that is used as a fallback source of properties. When an object gets a request for a property that it does not have, its prototype will be searched for the property, then the prototype’s prototype, and so on. So who is the prototype of that empty object? It is the great ancestral prototype, the entity behind almost all objects, Object.prototype.

Another problem with callbacks is that they can make handling errors difficult. If an asynchronous function (or an asynchronously invoked callback) throws an exception, there is no way for that exception to propagate back to the initiator of the asynchronous operation.

Htmx is adding functionality to this button (via JavaScript), but that functionality is augmenting HTML as a hypermedia. Htmx extends the hypermedia system of the web, rather than replacing that hypermedia system with a totally different architecture.

Quality was not a motivating concern in the design, implementation, or standardization of JavaScript. That puts a greater burden on the users of the language to resist the language's weaknesses.

You may also want to learn about cascading stylesheets and JavaScript for your HTML programs. The previous controls how pages are presented as well as make them more accessible while the latter adds more functionality to basic HTML.

An API lets web developers do things over the telecom system without having to learn how to speak telecom. They just write some code in common languages they already know, like Ruby, Python, JavaScript, or Java, and use it to build apps that can make and receive phone calls.

< div id =" app" > < button v-on:click =" toast" > Toast bread button > div > As for the JavaScript, write the following: new Vue({ el:'# app', methods:{ toast(){ alert(' Tosted!')}}}) Run the code! An event listener will be installed on the button.

JavaScript is a garbage-collected language, so you don’t really need to worry about memory allocations when you use reference types. However, it’s best to dereference objects that you no longer need so that the garbage collector can free up that memory. The best way to do this is to set the object variable to null.

A literal is syntax that allows you to define a reference value without explicitly creating an object, using the new operator and the object’s constructor.

This may be surprising if you regularly use Chrome on your iPhone or iPad. However, these are really just the “iOS system version of [Apple’s Safari] WebKit wrapped around Google’s own browser UI,” according to the Apple expert John Gruber, and the iOS Chrome app [cannot] “use the Chrome rendering or JavaScript engines.” What we think of as Chrome on iOS is simply a variant of Apple’s own Safari browser, but one that logs into Google’s account system.§10

Unfortunately, JavaScript will only do exactly what you ask it to do.

Users do not care what technologies you use. They only care that a website is fast and accessible. That’s the core of what responsible usage of JavaScript is all about: prioritizing user experience over developer experience.

Users do not care what technologies you use. They only care that a website is fast and accessible. That’s the core of what responsible usage of JavaScript is all about: prioritizing user experience over developer experience..

communication include

The only thing worse than not knowing why some code breaks is not knowing why it worked in the first place! It's the classic "house of cards" mentality: "it works, but I'm not sure why, so nobody touch it!" You may have heard, "Hell is other people" (Sartre), and the programmer meme twist, "Hell is other people's code." I believe truly: "Hell is not understanding my own code.

print "Hello World!" Write this code in a text file and save it as main.py. Execute the code by writing main.py on the python command prompt to get the desired result.

If we decide to never use an impure feature, then that feature can no longer sap and impurify the essence of our function bodies.

The converted string is assigned to a variable. In this case, it's the same variable whose string is being converted,

Node.js is a powerful, open-source, server-side JavaScript runtime environment that enables developers to build scalable and high-performance applications. Leveraging event-driven architecture and non-blocking I/O operations, Node.js allows for efficient handling of concurrent requests, making it ideal for building real-time web applications, APIs, and microservices. With its extensive ecosystem of libraries and frameworks, Node.js empowers developers to create fast, lightweight, and modern applications across various domains.

making use of materials recovered and curated by The Agrippa Files Website. The winning submission was by Robert Xiao, but the whole effort was reported in a collaborative open-source mode. All the submissions and implementations of code were published online under a Creative Commons License (Attribution-Noncommerical 3.0 Unported). The contest sponsors implemented the decryption/re-encryption in Javascript, so that anyone who was curious could run the process in a Web browser. Quinn

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.

которая сопровождает Javascript в силу его неблокируемой архитектуры

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.

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]

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

Opal is a Ruby to JavaScript compiler.

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

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

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.

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

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.

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

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

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.