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Id
15509083
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0
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1
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2013-03-19T19:48:57.847
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2013-03-19T19:48:57.847
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29
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LastEditorDisplayName
text
Body
Here's another approach for defining properties with getters and setters in CoffeeScript that maintains a relatively clean syntax without adding anything to the global Function prototype (which I'd rather not do): <pre><code>class Person constructor: (@firstName, @lastName) -> Object.defineProperties @prototype, fullName: get: -> "#{@firstName} #{@lastName}" set: (name) -> [@firstName, @lastName] = name.split ' ' p = new Person 'Robert', 'Paulson' console.log p.fullName # Robert Paulson p.fullName = 'Space Monkey' console.log p.lastName # Monkey </code></pre> It works well with many properties. For example, here's a Rectangle class that is defined in terms of (x, y, width, height), but provides accessors for an alternative representation (x1, y1, x2, y2): <pre><code>class Rectangle constructor: (@x, @y, @w, @h) -> Object.defineProperties @prototype, x1: get: -> @x set: (@x) -> x2: get: -> @x + @w set: (x2) -> @w = x2 - @x y1: get: -> @y set: (@y) -> y2: get: -> @y + @h set: (y2) -> @w = y2 - @y r = new Rectangle 5, 6, 10, 11 console.log r.x2 # 15 </code></pre> Here's <a href="http://coffeescript.org/#try:class%20Rectangle%0A%20%20constructor%3A%20(%40x%2C%20%40y%2C%20%40w%2C%20%40h)%20-%3E%0A%20%20Object.defineProperties%20%40prototype%2C%0A%20%20%20%20x1%3A%0A%20%20%20%20%20%20get%3A%20-%3E%20%40x%0A%20%20%20%20%20%20set%3A%20(%40x)%20-%3E%0A%20%20%20%20x2%3A%0A%20%20%20%20%20%20get%3A%20-%3E%20%40x%20%2B%20%40w%0A%20%20%20%20%20%20set%3A%20(x2)%20-%3E%20%40w%20%3D%20x2%20-%20%40x%0A%20%20%20%20y1%3A%0A%20%20%20%20%20%20get%3A%20-%3E%20%40y%0A%20%20%20%20%20%20set%3A%20(%40y)%20-%3E%0A%20%20%20%20y2%3A%0A%20%20%20%20%20%20get%3A%20-%3E%20%40y%20%2B%20%40h%0A%20%20%20%20%20%20set%3A%20(y2)%20-%3E%20%40w%20%3D%20y2%20-%20%40y%0A%0Ar%20%3D%20new%20Rectangle%205%2C%206%2C%2010%2C%2011%0Aconsole.log%20r.x2%20%23%2015" rel="noreferrer">the corresponding JavaScript code</a>. Enjoy!
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1. POCoffeeScript: Getter/Setter in Object Initializers
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1. UScurran
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