By Ricardo Tomasi
A functional and concise creation to CoffeeScript, a programming language that compiles into JavaScript and that makes operating with JavaScript more uncomplicated. The publication lays out the fundamentals of the language, its syntax, and the fascinating good points that set it except JavaScript. it's going to fulfill somebody with an intermediate point of knowing of JavaScript who wishes a conceptual and sensible creation to CoffeeScript.
The booklet is predicated round a realistic undertaking, prime you thru the construction of an easy HTML-based 2nd online game, and explaining the language's philosophy, syntax, and contours step by step alongside the best way. You'll manage to see effects on-screen from the very starting, beginning with an easy JavaScript drawing functionality reworked into CoffeeScript. The game's code is predicated on good- understood rules and previous artwork, utilizing universal, basic programming styles which are effortless to understand whereas additionally demonstrating CoffeeScript's expressiveness.
this can be a enjoyable and fast moving e-book that rewards you for every accomplished step with attention-grabbing online game positive aspects. you'll end the ebook with the feel of feat that comes from construction anything enjoyable, in addition to having won an effective realizing of CoffeeScript and an curiosity in exploring its extra complex features.
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Additional resources for Jump Start CoffeeScript
Example text
In our game, this is perfect. For the majority of the time, we’ll want normal-size tiles. ), as we won’t be needing a screen full of random tiles any longer. drawSprite(0, 0, 50, 50) Then, when we want the extra features, we just add in the extra parameters, overriding the height, width, scale, or all of the optional arguments. 1 shows the result. 1. The two-tile-high club Win By Default When compiled, the JavaScript simply checks if the argument is null. If so, it assigns the default value—so it’s more useful and natural to only include defaults for the trailing arguments (or all arguments), otherwise the client code would have to explicitly pass nulls to get the defaults.
Function chaining is very useful when processing lists and the result of each operation is a new list on which further operations can be performed. This will be particularly familiar to developers who’ve used jQuery (which we’ll cover in the section called “Using jQuery” in Chapter 6) where function chaining is an addictive habit! moveTo(10, 10)); Notice that the chain is broken and the moveTo function is applied to the player1 object? If you think of your chains as a single line of code, the problem is more obvious.
Log Before we move on, let’s look at our alternatives to testing via alert. So far, we’ve been alerting things to see some output. It’s a tried-and-true method of debugging code, but we have some better choices at our disposal these days. Modern versions of Chrome and Firefox—along with IE9—contain a console tool for this purpose so that our debugging avoids blocking the main browser thread as it does with the alert dialog. " These will appear in the console window, which can be opened from a keyboard shortcut or via the application menus.