By Alex Hudson
Introduces the language, syntax, and techniques of CoffeeScript
Covers the advance of either cellular and wealthy net apps
Explores the HTML5 characteristic set, real-time communique, and utilizing CoffeeScript inside of node.js projects
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USING UTILITY FUNCTIONS Functions in CoffeeScript are so easy to define they quickly become ubiquitous: written in good style, a non-trivial CoffeeScript program often uses a lot of small functions to make repetitive tasks easier. I call these utility functions, although there’s nothing special about them in terms of CoffeeScript: it’s just a natural consequence of the language. Within this slideshow, you need to be able to change CSS attributes at run-time: the images can slide in either direction.
I call these utility functions, although there’s nothing special about them in terms of CoffeeScript: it’s just a natural consequence of the language. Within this slideshow, you need to be able to change CSS attributes at run-time: the images can slide in either direction. By convention in this code, a direction of 1 means “slide from left to right”, while any other value means “slide from right to left”. Rather than hard-coding a specific set of styles for each direction it would be better to parameterize the CSS, but at this point you run into a problem with CoffeeScript.
For example, when counting from 0 to 7, the resulting series modulo 4 would go from 0 to 3 twice (0%4 is 0, 3%4 is 3, 4%4 is 0 again, 5%4 is 1 again). This is often used in web development where repetitive patterns are used—a loop value modulo 2 is often used to color the alternate rows in a table, for example. In this example, calculating the result modulo the number of panels ensures the counter never runs off the positive end of the array: It’s always wrapped back to 0. When working backwards through the panels though, modulo itself doesn’t offer much help—it’s quite happy to work through negative numbers, rather than wrapping –1 back to the number of panels.