Explanation
“@instance:” allows us to attach an object/value to the Foo class instead of Foo’s prototype. Recall that “@” in CoffeeScript refers to JavaScript’s “this”.
After “@instance:” there is a function that is immediately executed. This function returns a function, closed around a variable called instance. Both these functions have their context (their “this”) bound to the Foo object using CoffeeScript’s wonderful “define and bind” operator “=>” as opposed to the normal function definition operator “->”.
When called, the function that “@instance” ends up referring to simply checks to see if the “instance” variable is empty and if so, assigns a new instance of Foo to it. Newing up a Foo is done using the “@” symbol since the function’s “this” refers to the Foo object. It then returns the instance.
Output
The CoffeeScript above compiles down to this:
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Halo 3: ODST 2009 first-person shooter recreation developed by Bungie.
Published by Microsoft Game Studios. The fifth installment in the Halo franchise as a facet recreation,[1] it was released on the Xbox
360 in September 2009. Players assume the roles of United Nations
Space Command Marines, known as “Orbital Drop Shock Troopers” or ODSTs, during and after
the events of Halo 2. In the sport’s campaign mode,
players discover the ruined city of latest Mombasa
to discover what occurred to their missing teammates within the midst of an alien invasion. In the
“Firefight” multiplayer choice, gamers battle more and more troublesome waves of enemies to score factors and survive as long
as possible; Halo 3′s multiplayer is contained on a separate disc packaged with ODST.
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