Schmonference 2012: Introducing "CoffeeScript II: The Wrath of Khan"

Transcript

1. Michael Ficarra Schmonference 2012 CoffeeScript II: The Wrath of Khan
4. THIS GUY
5. http://kck.st/HDNjnC
6. http://arborjs.org/halfviz/#/MjU3Mw
8. advantages • standardised intermediate representations • more powerful parser • better error reports • forces consistent indentation ▪ and allows a consistent base indentation, useful for compiling copied sections of code • two-pass variable naming • specify output formatting • line mappings
10. advantages • standardised intermediate representations • more powerful parser • better error reports • forces consistent indentation ▪ and allows a consistent base indentation, useful for compiling copied sections of code • two-pass variable naming • specify output formatting • line mappings
14. advantages • standardised intermediate representations • more powerful parser • better error reports • forces consistent indentation ▪ and allows a consistent base indentation, useful for compiling copied sections of code • two-pass variable naming • specify output formatting • line mappings
16. advantages • standardised intermediate representations • more powerful parser • better error reports • forces consistent indentation ▪ and allows a consistent base indentation, useful for compiling copied sections of code • two-pass variable naming • specify output formatting • line mappings
17. advantages: tooling • automatic code formatting in editor • syntax highlighter • code coverage • static analysis tools ▪ dead code detection ▪ cyclomatic complexity ▪ reassignment warnings ▪ detecting non-idiomatic style (linting)
19. and now for something completely different
20. let-expressions do ($ = jQuery) -> ... (function($){ ... })(jQuery)
21. not in, not of, not instanceof a not in b a not of b a not instanceof b [].indexOf.call(b, a) < 0 !(a in b) !(a instanceof b)
22. anonymous classes fn class then method: -> fn((function() { function _Class() {} _Class.prototype.m = function() {}; return _Class; })());
23. switch on truthiness switch when a then b switch (false) { case !a: b; }
24. destructuring everywhere a for {prop: a} in b var a, _i, _len; for (_i = 0; _i < b.length; _i++) { a = b[_i].prop; a; }
25. destructuring everywhere ({prop: a}) -> (function(_arg) { var a; a = _arg.prop; });
26. semicolon is seq operator a = (fn(); b) var a; a = (fn(), b);
27. binary number literals 0b1001100110111 0x1337
28. follow the project on twitter @CSatGRPN https://twitter.com/CSatGRPN