By Nicholas C. Zakas
ISBN-10: 1449327680
ISBN-13: 9781449327682
You have got yes rules approximately writing code while operating by myself, yet staff improvement calls for that everybody use an analogous process. With the JavaScript practices during this ebook - together with code sort, programming assistance, and automation - you are going to write maintainable code that different workforce contributors can simply comprehend, adapt, and expand. writer Nicholas Zakas assembled this choice of top practices as a front-end tech chief at Yahoo!, after finishing his personal trip from solo hacker to crew participant. He additionally comprises principles urged by way of different professionals. Use the following pointers and methods to aid your group put aside person personal tastes and serve as at the next point.
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Additional resources for Maintainable JavaScript: Writing Readable Code
Sample text
My preference is to omit default when there is no default action and annotate it using a comment, as in this example: switch(condition) { case "first": // code break; case "second": // code break; } // no default This way, the code author’s intent is clear that there should be no default action, and you save some bytes by not including extra unnecessary syntax. info The with Statement The with statement changes how the containing context interprets variables. It allows properties and methods from a particular object to be accessed as if they were local variables and functions, omitting the object identifier altogether.
Zakas" }; This is the format most commonly seen in open source JavaScript code. Though it’s not commonly documented, the Google JavaScript Style Guide does recommend this format. Crockford’s Code Conventions recommends using object literals over the Object constructor but does not specify a particular format. info Array Literals Array literals, as with object literals, are a more compact way of defining arrays in JavaScript. Explicitly using the Array constructor, as in this example, is generally frowned upon: // Bad var colors = new Array("red", "green", "blue"); var numbers = new Array(1, 2, 3, 4); Instead of using the Array constructor, you can use two square brackets and include the initial members of the array: // Good var colors = [ "red", "green", "blue" ]; var numbers = [ 1, 2, 3, 4 ]; This pattern is widely used and quite common in JavaScript.
JSLint does not warn if additional blank lines are included. As with other aspects of coding style, this choice is completely a matter of preference. Falling Through Another popular source of debate is whether falling through from one case to another is an acceptable practice. Accidentally omitting a break at the end of a case is a very common source of bugs, so Douglas Crockford argues that every case should end with break, return, or throw, without exception. JSLint warns when one case falls through into another.
Maintainable JavaScript: Writing Readable Code by Nicholas C. Zakas
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