Download e-book for iPad: Maintainable JavaScript by Nicholas C. Zakas

By Nicholas C. Zakas

ISBN-10: 1449327680

ISBN-13: 9781449327682

You will have certain principles approximately writing code while operating on my own, yet group improvement calls for that everybody use an analogous process. With the JavaScript practices during this book—including code variety, programming counsel, and automation—you’ll the way to write maintainable code that different staff contributors can simply comprehend, adapt, and extend.

Author Nicholas Zakas assembled this selection of most sensible practices as a front-end tech chief at Yahoo!, after finishing his personal trip from solo hacker to crew participant. He additionally comprises principles suggested through different specialists. Use the following pointers and strategies to assist your crew put aside person personal tastes and serve as at the next level.

* identify particular code conventions in your crew
* Use instruments corresponding to JSLint and JSHint to maintain your group on the right track
* undertake sort instructions, resembling simple formatting, to assist your staff produce uniform code
* observe numerous programming practices to unravel difficulties and enhance code caliber
* Create an automatic JavaScript construct approach utilizing a number of utilities
* combine browser-based JavaScript trying out with instruments akin to the YUI try out Selenium driving force

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Extra info for Maintainable JavaScript

Example text

My recommendation is to allow fall-throughs as long as a comment is used to indicate that the fallthrough is intentional. default Another point of contention with regard to switch is whether a default case is required. Some believe that a default should always be included even if the default action is to do nothing, as in: switch(condition) { case "first": // code break; case "second": // code break; } default: // do nothing You’re likely to find open source JavaScript code following this pattern, including default and just leaving a comment that nothing should happen there.

Here are some examples: // Good if (condition) { // if you made it here, then all security checks passed allowed(); } // Bad: No empty line preceding comment if (condition) { // if you made it here, then all security checks passed allowed(); } // Bad: Wrong indentation if (condition) { // if you made it here, then all security checks passed allowed(); } // Good var result = something + somethingElse; // somethingElse will never be null // Bad: Not enough space between code and comment var result = something + somethingElse;// somethingElse will never be null // Good // if (condition) { // doSomething(); // thenDoSomethingElse(); // } // // // // // // if } Bad: This should be a multiline comment This next piece of code is quite difficult, so let me explain.

Constructors JavaScript constructors are simply functions that are used to create objects via the new operator. The language contains many built-in constructors, such as Object and RegExp, and developers can add their own constructors to create new types. As with Naming | 13 other naming conventions, constructors follow the native language, so constructors are formatted using Pascal case. Pascal case is the same as camel case except that the initial letter is uppercase. So instead of anotherName, you would use AnotherName.

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Maintainable JavaScript by Nicholas C. Zakas

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