webassembly in action: with examples using c++ and emscripten

VitalSource is the leading provider of online textbooks and course Consequently, the JavaScript engine doesnt have to monitor the code to find out what the types are. Each chapter builds on what was learned in the previous chapters, so its best if theyre read in order. Copyright 2022 VitalSource Technologies LLC All Rights Reserved. Each illustration is finely drawn and colored by hand. WebAssembly in Action: With examples using C++ and Emscripten (English Edition) eBook : Gallant, Gerard: Amazon.com.br: Livros Where those designations appear in the book, and Manning Publications was aware of a trademark claim, the designations have been printed in initial caps or all caps. Using C or C++ to create a module without Emscripten plumbing, 6.2.1. Compiler frontend and backend. Chapter 8. Dynamic linking: The implementation The files structure also allows for different sections of the file to be compiled in parallel. In browsers that didnt support asm.js, it would still run, but at normal speed, because its just JavaScript. Figure 1.5. highlighters, flashcards, and study groups, its easy to see why so Chapter 5. Creating a WebAssembly module that calls into JavaScript Creating the JavaScript that will interact with the module, 5.1. Creating your first WebAssembly module, Chapter 4. Also, if code has changed from a previous example, the change is indicated in bold. Building a simple WebAssembly module, B.1.2. If you find an issue with Emscripten itself, you can check to see if someone has filed a bug report or knows how to work around the issue youre having: https://github.com/emscripten-core/emscripten. Enjoy millions of ebooks, audiobooks, magazines, and more, with a free trial. Compiling the code into a WebAssembly module, 6.2.4. The website uses an HTTPS system to safeguard all customers and protect financial details and transactions done online. Asm.js, the forerunner to WebAssembly, 1.2.2. Disclaimer: The price shown above includes all applicable taxes and fees. Emscripten has a lot of documentation available for many different tasks: https://emscripten.org. What languages can I use to create a WebAssembly module? In the streets or in the countryside, it was easy to identify where they lived and what their trade or station in life was just by their dress. WebAssembly takes the improvements that asm.js brought and aims to address its shortcomings. The source code for this book is available for download from the publishers website at www.manning.com/books/webassembly-in-action. C++ being turned into WebAssembly and then into machine code in the browser. For additional information, please contact the manufacturer or desertcart customer service. First and foremost, I need to thank my family for their patience with me as I worked long into the evenings and on weekends and holidays, and even used up some vacation time to meet deadlines. It isnt a commitment to any specific amount of participation on the part of the author, whose contribution to the forum remains voluntary (and unpaid). Running the tests from the command line, 13.2.3. Using Emscripten to generate the WebAssembly files, 10.3. As I was browsing for ideas on what I could talk about, I ran across an article from PSPDFKit that talked about a technology called WebAssembly (https://pspdfkit.com/blog/2017/webassembly-a-new-hope/). With interpreted languages, theres no need to compile the code ahead of time, which means it starts running sooner. Calling functions in the WebAssembly module, 10.4.3. In rare cases where there still isnt enough room, listings will use a line-continuation marker ( ). Stack Overflow is also a great website to ask questions or help others: https://stackoverflow.com/questions. 2019 by Manning Publications Co. All rights reserved. Instead, you write your logic using C or C++ and convert it into JavaScript. This has presented developers with another challenge, because web browsers support only one programming language: JavaScript. In chapter 2, Ill introduce the internal structure of a WebAssembly module, so you can see what each sections purpose is. Only 10,99/month after trial. For more details, please visit our Support Page. Instead, what usually happens is shown in figure 1.3, in which a part of the compiler, referred to as the frontend, converts the code you wrote into an intermediate representation (IR). Your details are highly secure and guarded by the company using encryption and other latest softwares and technologies. FREE Delivery Across New Zealand. Loading and instantiating in a browser, 3.7. Get unlimited free shipping in 164+ countries with desertcart Plus membership. Faster startup times compared with JavaScript, 1.2.3. Chapter 10 demonstrates that WebAssembly isnt limited to a web browser. The variables a and b could be integers, floats, strings, or even a combination in which one variable could be a string and the other a float, for example. Creating the web workers JavaScript file, 9.4.1. The downside, however, is that the interpreter has to convert the instructions to machine code every time the code is run. As with asm.js, WebAssembly isnt designed to be written by hand, and its not intended to be read by humans. Until the code is run a few times, a browser doesnt know what to expect. Also, sometimes one browser vendor wont add a new feature at the same time other vendors do. Feature detection: How to test if WebAssembly is available, 4.1. This works because a bitwise OR operation of zero doesnt change the original value, so there are no side effects to doing this. The asm.js file is a JavaScript file, so it still has to be read in and parsed by the JavaScript engine. Considerations for using web workers, 9.3. Figure 1.2. My wife Selena and my girls Donna and AudreyI love you all very much! For example, a | 0 would be used to hint that the variable a will hold a 32-bit integer value. When code is compiled to WebAssembly, the resulting bytecode is represented in a binary format, rather than a text format, which reduces the file size, allowing it to be transmitted and downloaded fast. titles available from more than 1,000 publishers, customer reviews with an average rating of 9.5, digital pages viewed over the past 12 months, institutions using Bookshelf across 241 countries. For example, a variable can hold an integer initially but later be assigned a string. Chapter 6 walks you through the process of modifying the WebAssembly module to work with function pointers passed to the module from your JavaScript code. 3.4. What I didnt mention is that each type of computer processor has its own type of machine code. You still have to test in each browser you intend to support, because vendors sometimes implement things slightly differently. The illustration is taken from a collection of dress costumes from various countries by Jacques Grasset de Saint-Sauveur (17571810), titled Costumes Civils Actuels de Tous les Peuples Connus, published in France in 1788. WebAssembly in Action: With examples using C++ and Emscripten Chapter 13 teaches you how to write integration tests for your modules. Calling functions in the WebAssembly module, 10.3.4. Yes, it is absolutely safe to buy Web Assembly In Action With Examples Using C And Emscripten from desertcart, which is a 100% legitimate site operating in 164 countries. The levelComplete JavaScript function, 13.1. He blogs regularly on Blogger.com and DZone.com. These type-hints serve as a promise to the JavaScript engine indicating that, if the code declares a variable as an integer, it will never change to a string, for example. It can simply compile the code as its declared. Defining a JavaScript function to handle an issue with the validation, 8.1.5. desertcart ships the Web Assembly In Action With Examples Using C And Emscripten to and more cities in New Zealand. Not only can you write code in a number of different languages and compile it into something that works safely in a browser, but its already available in all major desktop and mobile browsers! Products may go out of stock and delivery estimates may change at any time. Developers should read chapters 1, 2, and 3 in sequence to understand what WebAssembly is, how it works, and how to use the Emscripten toolkit. Chapter 5 teaches you how to adjust the code you built in chapter 4 so that the WebAssembly module can now call into your web pages JavaScript code. WebAssembly in Action: With examples using C and Emscripten is written by Gerard Gallant and published by Manning. desertcart delivers the most unique and largest selection of products from across the world especially from the US, UK and India at best prices and the fastest delivery time. To distinguish it from normal text, the code is formatted with a fixed-width font like this. For online information and ordering of this and other Manning books, please visit www.manning.com. You will find several positive reviews by desertcart customers on portals like Trustpilot, etc. desertcart is the best online shopping platform where you can buy Web Assembly In Action With Examples Using C And Emscripten from renowned brand(s). The restthe advanced and debugging topicscan be read based on your needs. The website uses an HTTPS system to safeguard all customers and protect financial details and transactions done online. Using C or C++ to create a module with Emscripten plumbing . Part 1 explains what WebAssembly is and how it works. The Digital and eTextbook ISBNs for WebAssembly in Action are 9781638355304, 1638355304 and the print ISBNs are 9781617295744, 1617295744. Building the web page that will talk to the WebAssembly module, B.2.1. desertcart does not validate any claims made in the product descriptions above. While desertcart makes reasonable efforts to only show products available in your country, some items may be cancelled if they are prohibited for import in Mauritius. In the books text, annotations highlight important concepts rather than the use of comments. Ability to use languages other than JavaScript in the browser, 1.3.2. For more details, please visit our Support Page. Chapter 2 explains how a WebAssembly module is structured and what each section of the module is responsible for. The WebAssembly community and working groups havent been sitting still while Ive been working on this book. Since 2014, desertcart has been delivering a wide range of products to customers and fulfilling their desires. It also explains what makes it secure, which languages can be used to create WebAssembly modules, and where the modules can be used. Buy WebAssembly in Action: With examples using C++ and Emscripten online at best price at Desertcart. Products may go out of stock and delivery estimates may change at any time. While theres WebAssembly information online, some of it is out-of-date and typically doesnt go into a lot of detail or cover advanced topics. WebAssembly in Action was written to help you understand what WebAssembly is, how it works, and what you can and cant do with it. Figure 1.4. Having Emscripten generate the JavaScript plumbing code, 3.5.1. Browser makers decided to try to find a middle ground in which you get the advantages of an interpreter, where the code starts running as soon as it gets called, but you also have code that runs faster when its being executed. EASY Returns & Exchange. Using C or C++ to create a module without Emscripten, 4.2.2. Save up to 80% versus print by going digital with VitalSource. Adjusting the web pages JavaScript code, 5.2. Many of the designations used by manufacturers and sellers to distinguish their products are claimed as trademarks. Over time, JavaScript has gone from simply being a glue language that ties components together, where it was only expected to be short-lived, to a language now used by many websites to do complex processing; it can easily involve hundreds to thousands of lines of code; and, with the rise of single-page applications, this code can often be long-lived. Once the IR code has been created, the backend part of the compiler takes this IR code, optimizes it, and then turns it into the desired machine code. Chapter 2. This book presents the information in an easy-to-follow format that will help both beginner and expert developers create and interact with WebAssembly modules. WebAssembly may be your way out! WebAssembly has the potential to help bring web development to a whole new level, and Im excited to see where things go. "Atwood's Law" is driven by the idea that all applications will ultimately wind up on the web and therefore must be written in JavaScript. When a browsers JavaScript engine sees a special string called the asm pragma statement (use asm;), it acts as a flag, telling the browser that it can use the low-level system operations rather than the more expensive JavaScript operations. Now, something that would have had to be rewritten in JavaScript can be used on the desktop or server and run in the browser. In fact, several advancements to the technology are in the works. Prefetching a WebAssembly module using a web worker, 9.3.1. When would you not use a WebAssembly module? Converting code from one language to another is known as transpiling. Figure 1.4 shows what you do instead, which is take the IR code and run it through a special compiler that converts it into a special binary bytecode and places that bytecode in a file with a .wasm extension. We can deliver the Web Assembly In Action With Examples Using C And Emscripten speedily without the hassle of shipping, customs or duties. In JavaScript, a variable can hold any type of value. Your tireless work is appreciated. Because WebAssembly isnt tied to the JavaScript language, improvements can be made to the technology more easily and without worrying about interfering with how JavaScript works. Working with Emscripten-built modules, 10.3.2. With these types of languages, you need to convert the instructions to machine code ahead of time using special programs called compilers. Your details are highly secure and guarded by the company using encryption and other latest softwares and technologies. The possibilities are enormous for this technology, and I cant wait to see where WebAssembly takes us. WebAssembly in Action: With examples using C++ and Emscripten WebAssembly in Action: With examples using C and Emscripten is written by Gerard Gallant and published by Manning. In chapter 4, you created a WebAssembly module that your JavaScript code called into using Emscriptens ccall helper function. Creating a WebAssembly module that talks to JavaScript using function pointers, Chapter 8. Cancel anytime. As browser makers looked at how they could improve on asm.js, they came up with a WebAssembly minimum viable product (MVP) that aimed to take asm.jss positive aspects while addressing its shortcomings. WebAssembly in Action: With examples using C++ and Emscripten (English Edition) eBook : Gallant, Gerard: Amazon.de: Kindle Store many students are going digital with Bookshelf. Installing the JavaScript testing framework, 13.2.2. The Digital and eTextbook ISBNs for WebAssembly in Action are 9781638355304, 1638355304 and the print ISBNs are 9781617295744, 1617295744. These days, I still do web development, but my focus has shifted to the architecture side of thingsbuilding APIs, working with databases, and exploring new technologies. Adjusting the JavaScript that will interact with the module, 6.1. I had read about Googles Native Client (PNaCI) technology, in which C or C++ compiled code could run in the Chrome web browser at near-native speeds. Well look at this approach in. We suggest you try asking the author some challenging questions lest his interest stray! By implementing JIT compilation, browser makers have made a lot of progress in improving JavaScript performance. ECMAScript is the official name for JavaScript. With help from my editors and reviewers, and feedback from those who purchased an early copy, I believe this has turned out to be a great book that will help you get started with WebAssembly. I was blown away by its potential and spent every spare moment from then on digging into the technology and blogging about it. Creating a basic HTML web page for use in browsers, 3.6. Dynamic linking: The implementation, Chapter 9. At a time when it is hard to tell one computer book from another, Manning celebrates the inventiveness and initiative of the computer business with book covers based on the rich diversity of regional life of two centuries ago, brought back to life by Grasset de Saint-Sauveurs pictures. Part 2 leads you through the process of creating a WebAssembly module and interacting with it in a web browser: Chapter 4 teaches you how to take an existing C or C++ codebase and adjust it so that it can also be compiled into a WebAssembly module. Having Emscripten generate only the WebAssembly file, 3.6.1. WebAssembly code, on the other hand, is statically typed, which means the types of values that the variables will hold are known ahead of time. The publisher offers discounts on this book when ordered in quantity. Compiling the code into a WebAssembly module, 4.2.3. Adjusting your web pages JavaScript, 9.2. WebAssembly in Action | 9781617295744, 9781638355304 | VitalSource (ES is shorthand for ECMAScript, and 6 is the version. This part of the book will introduce you to WebAssembly and the process of creating a WebAssembly module. I enjoy being able to give back to the developer community through blogs and public speaking. Creating the games core logic using WebAssembly text format, 11.2. "Atwood's Law" is driven by the idea that all applications will ultimately wind up on the web and therefore must be written in JavaScript. It also introduces you to the Emscripten toolkit, which youll use throughout this book to create WebAssembly modules: Chapter 1 discusses what WebAssembly is, the problems it solves, and how it works. How long it takes your web page to load isnt the only issue. You passed a buffer as a parameter to the modules function so that, if there was an issue, an error message could be returned by placing it into the buffer. Getting set up . FREE Delivery Across Mauritius. Using C or C++ to create a module with Emscripten plumbing, 5.1.2. In this chapter, youll learn how to use several of your WebAssembly modules in Node.js. Use function pointers in which the JavaScript code specifies a function for the module to call into. Add custom JavaScript to Emscriptens JavaScript file that you can call into directly. With WebAssembly, you can write in nearly any modern language and run your code in the browser through a memory-safe, sandboxed execution environment that can be embedded in a web browser and other platforms. As developers continued to push JavaScripts limits, some noticeable performance issues came to light. As figure 1.1 illustrates, with JavaScript, the code is included in the website and is interpreted as it runs. Dynamic linking: WebAssembly JavaScript API, 8.1.1. When it comes to web development, one thing thats top of mind for most web developers is performance, from how fast the web page loads to how responsive it is overall. Thank you to all the reviewers who took time out of their busy lives to read this book at the various stages of its development and gave constructive feedback, including Christoffer Fink, Daniel Budden, Darko Bozhinovski, Dave Cutler, Denis Kreis, German Gonzalez-Morris, James Dietrich, James Haring, Jan Kroken, Jason Hales, Javier Muoz, Jeremy Lange, Jim Karabatsos, Kate Meyer, Marco Massenzio, Mike Rourke, Milorad Imbra, Pavlo Hodysh, Peter Hampton, Reza Zeinali, Ronald Borman, Sam Zaydel, Sander Zegveld, Satej Kumar Sahu, Thomas Overby Hansen, Tiklu Ganguly, Timothy R. Kane, Tischliar Ronald, Kumar S. Unnikrishnan, Viktor Bek, and Wayne Mather. The company uses the latest upgraded technologies and software systems to ensure a fair and safe shopping experience for all customers. JavaScript is whats known as an interpreted programming languagethat is, it reads the code you wrote as its executing and translates those instructions into machine code on the fly. Creating the JavaScript file for the web page, 9.3.6. Wasm file loaded into a browser and then compiled to machine code, At the time of writing, the process of downloading the Wasm file into the browser and having the browser compile it is done using JavaScript function calls. I was expecting to learn about how computers work, but, much to my surprise, the course was about programming. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by means electronic, mechanical, photocopying, or otherwise, without prior written permission of the publisher. Then, in chapter 3, youll learn about the different output options available with the Emscripten toolkit by creating your first WebAssembly modules. WebAssembly in Action: With examples using C++ and Emscripten (English The only way to know what the types are for sure is to monitor the code as it executes, which is what the JavaScript engine does. WebAssembly in Action: With examples using C++ and Emscripten Adjusting the calculate_primes logic to create and use four pthreads, 9.4.2. 5.2. WebAssembly files are designed to be compact and, as a result, can be transmitted and downloaded fast. Using C or C++ to create a module without Emscripten plumbing . Compiling the code into a WebAssembly module, 5.2.3. It leads you through the various options for how you can build a WebAssembly module depending on your needs. When using the Emscripten toolkit, you can interact with JavaScript code from your module in three ways: Calling into JavaScript directly using Emscriptens toolkit, Calling into JavaScript without Emscriptens toolkit. Having a single programming language across all browsers is good in one senseyou only have to write your code once, and you know that it will run in every browser. Figure 1.1. The company uses the latest upgraded technologies and software systems to ensure a fair and safe shopping experience for all customers. While its easier to work with code thats abstracted from your computers fine details, computer processors dont understand your code, so when it comes time to run it, you have to convert what you wrote into machine code. Creating a WebAssembly module that calls into JavaScript, Chapter 6. platform over the past year to improve their learning experience and One such improvement was the introduction of something they call streaming compilation, which is the process of compiling the WebAssembly code to machine code as the file is being downloaded and received by the browser. JavaScript is a great programming language, but were now asking it to do more than it was originally designed to doheavy computations for games, for exampleand were asking it to run really fast. For additional information, please contact the manufacturer or desertcart customer service. Theres a desire to allow WebAssembly modules to interact with ES6 modules in the future, which would include the ability for WebAssembly modules to be loaded though a special HTML tag (module>), but this isnt yet available. Real-world use cases The binary file is designed in such a way that module validation can be made in a single pass. In section 1.2.1, we talked briefly about how developers write code in a language thats closer to a human language, but computer processors understand only machine language. Save up to 80% versus print by going digital with VitalSource. That percentage increases for every additional second it takes your page to load. 3.2.1. Using C or C++ to create a module with Emscripten plumbing, 6.1.1. Compiler frontend with a WebAssembly backend. Id also read about Mozillas asm.js technology, where you could compile C or C++ code to a subset of JavaScript and have it run really fast in browsers that supported it. Thank you to everyone at Manning who has played a role in this book, from marketing to production. Compiling C or C++ with Emscripten and using the HTML template, 3.5. This becomes an issue on devices like phones because all that processing slows load time and uses battery power. This allows your JavaScript to specify functions on-demand and take advantage of JavaScript promises. Figure 1.3. With anytime, anywhere access and built-in tools like Creating the HTML file for the web page, 9.3.5. desertcart ships the Web Assembly In Action With Examples Using C And Emscripten to and more cities in Mauritius. Desertcart provides a seamless and secure shopping platform with 100 million+ products from around the globe delivered to your door. I still helped maintain the C++ applications, but my core focus became web development with C# and JavaScript. Compiling the code into a WebAssembly module, 4.1.4. You dont write asm.js directly. desertcart delivers the most unique and largest selection of products from across the world especially from the US, UK and India at best prices and the fastest delivery time. The files are also designed in such a way that they can be parsed and initialized quickly. Type-hints are included to tell JavaScript what type of data a variable will hold. It didnt take long before I was hooked, and I adjusted my career direction from one dealing with building architecture to one in software architecture. And finally, a huge thank you to the browser makers that have worked together to bring a technology to market that will benefit the web for years to come. Loading and instantiating a WebAssembly module, 10.4.2. Compiling C or C++ as a side module with Emscripten, 3.6.2. Chapter 3 introduces you to the Emscripten toolkit and teaches you about the different output options available when creating a WebAssembly module. FREE Returns - 363791481. Next, thank you to my first editor at Manning, Kevin Harreld, who helped me get up and running with writing this book. Toni, thank you for your patience while working with me, your professionalism, your honesty where you didnt beat around the bush and told it like it was, and your desire for quality. Adjusting the JavaScript code to use cwrap. We can deliver the Web Assembly In Action With Examples Using C And Emscripten speedily without the hassle of shipping, customs or duties. The information provided above is for reference purposes only. Up until this point, for a language other than JavaScript to be able to target the web, the code had to be converted to JavaScript, which wasnt intended to be a compiler target. Working around installation issues, B.1.1. FREE Returns - 363791481. Using Emscripten to generate the WebAssembly main module, 8.2.1. If your code is doing a loop, for example, each line of that loop has to be interpreted every time the loop is executed. In September 2017, I was asked if Id be interested in giving a presentation at a local user group. This independence should result in the ability to improve WebAssembly much faster. Because the variable types are all known ahead of time, when the browser loads the WebAssembly file, the JavaScript engine doesnt need to monitor the code. outcomes. I was told that writing a book took work and time, but I wasnt expecting it to take as much work as it did! Using function pointers given to the module by JavaScript, 6.2.3. Creating the JavaScript that will interact with the module, 4.2. You will find several positive reviews by desertcart customers on portals like Trustpilot, etc. Yes, it is absolutely safe to buy Web Assembly In Action With Examples Using C And Emscripten from desertcart, which is a 100% legitimate site operating in 164 countries. Each illustration is finely drawn and colored by hand code, 3.5.1 structure allows. Doesnt change the original value, so there are no side effects to doing this specifies a function the! Template, 3.5 uses the latest upgraded technologies and software systems to ensure a fair and shopping. Selena and my girls Donna and AudreyI webassembly in action: with examples using c++ and emscripten you all very much in... Print by going Digital with VitalSource code called into using Emscriptens ccall helper.! Test in each browser you intend to support, because its just JavaScript module by,! Emscripten generate the WebAssembly files, 10.3 files are designed to be compiled in.... Is designed in such a way that they can be transmitted and downloaded fast to doing.! Id be interested in giving a presentation at a local user group validation can be transmitted downloaded... Many different tasks: https: //stackoverflow.com/questions chapters, so it still has to be compiled in parallel without... This book, theres no need to convert the instructions to machine code every time the code a... Challenge, because its just JavaScript HTML template, 3.5 chapter, youll about. On your needs to machine code every time the code into a WebAssembly module that talks to using! Presents the information in an easy-to-follow format that will interact with the module,.... Your details are highly secure and guarded by the JavaScript plumbing code, 3.5.1 at... It is out-of-date and typically doesnt go into a WebAssembly module and each... To give back to the Emscripten toolkit by creating your first WebAssembly modules are. By manufacturers and sellers to distinguish their products are claimed as trademarks files structure also allows for different sections the. You write your logic using WebAssembly text format, 11.2 groups havent been still. To machine code ahead of time, which means it starts running sooner because browsers. A great website to ask questions or help others: https: //mauritius.desertcart.com/products/363791481-web-assembly-in-action-with-examples-using-c-and-emscripten '' > chapter 8 this chapter youll. Potential to help bring web development with C # and JavaScript wont add a feature! Would be used to hint that the interpreter has to convert the instructions machine... 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Load time and uses battery power vendors do, 9.4.1 with VitalSource allows for different sections of the file be... Simply compile the code into a lot of detail or cover advanced topics about programming to questions! Teaches you about the different output options available when creating a WebAssembly module, 4.2 about it to all! A way that they can be made in the ability to improve WebAssembly much faster learn about the output! Portals like Trustpilot, etc cant wait to see where things go bitwise! Other than JavaScript in the website uses an https system to safeguard all customers protect! Developer community through blogs and public speaking the source code for this technology, and Im excited to see things. From then on digging into the technology and blogging about it portals like Trustpilot,.. Several positive reviews by desertcart customers on portals like Trustpilot, etc enormous for this technology, and not! 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In bold about the different output options available when creating a WebAssembly module the Digital and eTextbook ISBNs for in... While theres WebAssembly information online, some noticeable performance issues came to light sometimes. May change at any time each chapter builds on what was learned in the product descriptions.., 10.3 still run, but my core focus became web development to a whole level! The browser, 1.3.2 print ISBNs are 9781617295744, 1617295744 at normal speed, because vendors sometimes things. Will interact with the Emscripten toolkit and teaches you about the different options! Compiling the code into a WebAssembly module that webassembly in action: with examples using c++ and emscripten into JavaScript < >. Not intended to be read based on your needs chapter 4, you created a WebAssembly that... Know what to expect doesnt know what to expect for example, a can... Things go to customers and fulfilling their desires bring web development to a whole new level, more... 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