I was cleaning up my files this morning, and found this short little intro talk I gave at Winnipeg.RB a few months back when rails 3.1 came out with CoffeeScript enabled by default. It's a micro introduction to C

1. CoffeeScript
Like JavaScript, but without the horrible.
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2. Burke Libbey
Me @burkelibbey
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3. The 5 Second Pitch
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4. var foo = function() {
JavaScript return "bar";
}
CoffeeScript foo = -> "bar"
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5. “Sold! What did I just buy?”
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6. “CoffeeScript is a little language
that compiles into JavaScript”
– Jeremy Ashkenas, CoffeeScript author
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7. foo = -> "bar"
CoffeeScript Compiler
(function() {
var foo;
foo = function() {
return "bar";
};
}).call(this);
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8. “What’s wrong with JavaScript?”
Browser inconsistencies
Terrible DOM API
Redundant syntax
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9. “What’s wrong with JavaScript?”
Browser inconsistencies
Terrible DOM API
Redundant syntax
Most of the issues people have with JavaScript
boil down to these three points.
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10. “What’s wrong with JavaScript?”
Browser inconsistencies
Terrible DOM API
Redundant syntax
jQuery does a fantastic job of shielding you
from these two.
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11. “What’s wrong with JavaScript?”
Browser inconsistencies
Terrible DOM API
Redundant syntax
CoffeeScript fixes this one.
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12. So what’s wrong with the syntax?
function(x) {
return x * x;
}
For a functional language, having to write “function”
and “return” everywhere is more than a little strange.
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13. Anonymous Function Syntax
JavaScript function(x) { return x * x; }
Scheme (lambda (x) (* x x))
Erlang fun(X) -> X * X end.
CoffeeScript (x) -> x * x
Haskell x -> x * x
Clojure #(* % %)
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14. “I’m a masochist, and I like
typing a lot. Give me another
reason.”
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15. Rails 3.1 includes CoffeeScript
by default.
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16. ...to the chagrin of hypocrites the
world over.
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17. Sunday, 27 November, 11

18. Fighting Rails is usually doomed
to failure.
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19. So just suck it up and learn
CoffeeScript.
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20. Without further ado:
CoffeeScript Whirlwind tour
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21. three = -> 3
square = (x) -> x * x
add = (x, y)
x + y
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22. Default values!
fill = (container, liquid = "coffee") ->
"Filling the #{container} with #{liquid}..."
...and string interpolation!
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23. YAML-like hash literals work
kids =
brother:
name: "Max"
age: 11
sister:
name: "Ida"
age: 9
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24. Never type “var” again!
CoffeeScript does it for you.
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25. mood = greatlyImproved if singing
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26. if happy and knowsIt
clapsHands()
chaChaCha()
else
showIt()
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27. date = if friday then sue else jill
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28. options or= defaults
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29. I’m out of slides. Time for
live-coding!
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30. Thanks!
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