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:
Howdy, I do think your site might be having browser compatibility problems.
Whenever I look at your website in Safari, it looks
fine however when opening in Internet Explorer, it’s
got some overlapping issues. I merely wanted to provide you with a
quick heads up! Aside from that, excellent website!
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Hi, Neat post. There’s an issue along with your web site in internet explorer,
might check this? IE nonetheless is the marketplace chief and a big element of folks will
pass over your wonderful writing due to this problem.
The other day, while I was at work, my cousin stole my iPad and tested to see if
it can survive a thirty foot drop, just so she can be
a youtube sensation. My iPad is now destroyed and she has 83 views.
I know this is completely off topic but I had to share it with someone!
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