By Stoyan Stefanov
What's the easiest process for constructing an program with JavaScript? This ebook is helping you resolution that query with various JavaScript coding styles and top practices. If you're an skilled developer seeking to resolve difficulties with regards to gadgets, features, inheritance, and different language-specific different types, the abstractions and code templates during this consultant are ideal—whether you're utilizing JavaScript to write down a client-side, server-side, or machine application.
Written by way of JavaScript specialist Stoyan Stefanov—Senior Yahoo! Technical and architect of YSlow 2.0, the net web page functionality optimization tool—JavaScript Patterns contains sensible recommendation for enforcing every one trend mentioned, besides a number of hands-on examples. You'll additionally know about anti-patterns: universal programming techniques that reason extra difficulties than they solve.
• discover important behavior for writing top of the range JavaScript code, corresponding to warding off globals, utilizing unmarried var declarations, and more
• study why literal notation styles are less complicated choices to functions
• realize alternative ways to outline a functionality in JavaScript
• Create items that transcend the fundamental styles of utilizing item literals and functions
• research the choices to be had for code reuse and inheritance in JavaScript
• examine pattern JavaScript ways to universal layout styles corresponding to Singleton, manufacturing facility, Decorator, and more
• learn styles that observe particularly to the client-side browser atmosphere
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Additional info for JavaScript Patterns
Example text
And what should you indent? The rule is simple—anything within curly braces. This means the bodies of functions, loops (do, while, for, for-in), ifs, switches, and object properties in the object literal notation. The following code shows some examples of using indentation: function outer(a, b) { var c = 1, d = 2, inner; if (a > b) { inner = function () { return { r: c - d }; }; } else { inner = function () { return { r: c + d }; }; } return inner; } Curly Braces Curly braces should always be used, even in cases when they are optional.
In the second solution, you’re also not allowed to copy-paste from the first one, which helps prevent you from taking shortcuts or settling for the nonperfect solution. Peer Reviews Another way to make your code better is to have it peer reviewed. Peer reviews could be formal and standardized, even aided by specialized tools, and this is a great way to make the reviews a streamlined part of the development process. But not having the time to research and adopt review tools shouldn’t be in the way.
Another example is when working with DOM (Document Object Model) references. style; // do something with el and style... } Hoisting: A Problem with Scattered vars JavaScript enables you to have multiple var statements anywhere in a function, and they all act as if the variables were declared at the top of the function. This behavior is known as hoisting. This can lead to logical errors when you use a variable and then you declare it further in the function. For JavaScript, as long as a variable is in the same scope (same function), it’s considered declared, even when it’s used before the var declaration.