CoffeeScript: Accelerated JavaScript Development (Pragmatic) by Trevor Burnham

By Trevor Burnham

For 15 years, dynamic websites has been written in one language: JavaScript. Now, for the 1st time, programmers have an alternate that does not upload an additional layer of abstraction or require plugins. CoffeeScript offers all of JavaScript's performance wrapped in a cleanser, extra succinct syntax that encourages use of "the strong components" of the language.CoffeeScript: speeded up JavaScript Development is geared toward programmers who are looking to get a grip in this new language whereas enhancing their figuring out of JavaScript. you are going to know about time-saving positive aspects like record comprehensions and splats, manage your code into modules with extensible periods, and get your ft rainy with jQuery via construction a fast paced be aware game.The booklet additionally introduces Node.js, the key server-side JavaScript atmosphere. Node and CoffeeScript turn into an outstanding fit, permitting you to enhance the back and front ends of an internet program within the similar language. With CoffeeScript on your toolkit, you could write nice code at any place.

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Notice that the context given to callback itself is never used, and __func is never exposed to the outside world, ensuring that it’s always called in the context in which callback was defined. In practice, CoffeeScript uses a helper function named __bind, but the underlying technique is the same. => may be CoffeeScript’s most powerful shorthand. You might wonder why you shouldn’t just always use => instead of ->. There are two reasons. First, the binding code leads to some small overhead in both file size and execution time and is usually unnecessary.

Some frown on it because the JavaScript specification defines something called execution context, which is related but different. name) is a property of the context. name. The function itself hasn’t changed. We could call the following: setName 'Mr. Mistoffelees' And it would have no effect on cat. We can invoke a function in a particular context without attaching the function to that object by using the call or apply methods, which all functions have. name # 'Babe' call works the same way, except that it takes individual arguments rather than a single array.

But more importantly, while the chameleon-like nature of context is often confusing, it can also allow for very elegant code. For instance, many libraries pass critical information to callback functions through context.

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