By Lawrence Spencer
ISBN-10: 1119028728
ISBN-13: 9781119028727
Trustworthy JavaScript demonstrates tips on how to create test-driven improvement for large-scale JavaScript purposes that may stand the attempt of time and remain exact via long term use and upkeep. Taking a test-first method of software program structure, this e-book walks you thru numerous styles and practices and explains what they're alleged to do by means of having you write unit exams. Write the code to cross the unit assessments, so that you not just enhance your approach for structuring large-scale functions, yet you furthermore mght how you can try out your paintings. you are going to come away with hands-on perform that ends up in code that's right from the beginning, and has the attempt insurance to make sure that it remains right in the course of next upkeep. All code is supplied either within the textual content and on the net, so that you can instantly start designing extra entire, powerful functions. JavaScript has graduated from field-validation scripts to full-scale functions, yet many builders nonetheless method their paintings as though they have been writing basic scripts. if you are a type of builders, this ebook is the answer you must whip your code into form and create JavaScript functions that paintings.
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Extra info for Reliable JavaScript: How to Code Safely in the World's Most Dangerous Language
Example text
Line function, he anticipated changes in the way coordinates might be plucked from data and how the points might be joined (interpolated), and he wisely abstracted those features out of his function. What he did not think would change (at least not in a backward-incompatible way) was the SVG path specification. He dared to hard-code that a path could always start with "M" and continue with the points in order, as a text string. line would ever have to change. ” you ask! Coined by Barbara Liskov in a formal way in Data Abstraction and Hierarchy (SIGPLAN Notices 23, 5 [May, 1988]), this principle might be stated more colloquially for a JavaScript context as follows: Code written to use an object of a certain type should not have to change if provided with an object of a derived type.
It sends the validated user object to the server. ➤➤ It displays a message in the UI. Accordingly, we can enumerate three separate concerns at work: ➤➤ User verification ➤➤ Direct server communication Writing Code That Stays Correct ❘ 25 Direct UI manipulation ➤➤ Now try to come up with all the conditions that must be tested to ensure that the validateAndRegisterUser function operates correctly. Take your time; we’re not going anywhere. How many did you come up with? Probably quite a few. Here are some of the conditions we came up with: ➤➤ An Error is thrown if user is null.
Writing Code That Starts Correct What Johann Sebastian Bach said about playing a keyboard instrument applies equally to programming a computer: There’s nothing remarkable about it. All one has to do is hit the right keys at the right time and the instrument plays itself. This section is about hitting the right keys at the right time. As you might guess, there’s more to it than the uninitiated might think. But first, a story. Mastering the Features of JavaScript Have you ever seen someone get his head chopped off on a squash court?
Reliable JavaScript: How to Code Safely in the World's Most Dangerous Language by Lawrence Spencer
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