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An evening with CoffeeScript

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The evening

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The evening What is CoffeeScript How to use it Concepts CoffeeScript 101

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The evening

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The evening Hands–on Workshop

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number = 42 var number = 42;

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number = 42 var number = 42;

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CoffeeScript

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“The assembly language of the web.”

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http://www.flickr.com/photos/nathansmith/4704268314/

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Javascript: The Quirky Parts

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typeof null

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typeof null // "object"

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0, NaN, "", false, null, undefined

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var numbers = ['10','10','10']; numbers.map(parseInt);

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var numbers = ['10','10','10']; numbers.map(parseInt); // [10, NaN, 2]

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array.map(callback[, thisArg]) callback(value[, index[, array]]) parseInt(string, radix);

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array.map(callback[, thisArg]) callback(value[, index[, array]]) parseInt(string, radix);

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array.map(callback[, thisArg]) callback(value[, index[, array]]) parseInt(string, radix);

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var numbers = ['10','10','10']; parseInt('10', 0, numbers); // 10 (decimal) parseInt('10', 1, numbers); // NaN parseInt('10', 2, numbers); // 2 (binary)

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“Exactly which radix is chosen [by default] is implementation- dependent.”

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var numbers = ['10','10','10']; parseInt('10', 0, numbers); // 10 (decimal) parseInt('10', 1, numbers); // NaN parseInt('10', 2, numbers); // 2 (binary)

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[1, 71, 4, 5609, 102].sort()

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[1, 71, 4, 5609, 102].sort() # => [1, 102, 4, 5609, 71]

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[1, 71, 4, 5609, 102].sort(function(a, b){ return a - b; });

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['a', 'b', 'c'].join()

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['a', 'b', 'c'].join() # => "a,b,c"

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abstract boolean break byte case catch char class const continue debugger default delete do double else enum export extends false final finally float for function goto if implements import in instanceof int interface long native new null package private protected public return short static super switch synchronized this throw throws transient true try typeof var volatile void while with

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abstract boolean break byte case catch char class const continue debugger default delete do double else enum export extends false final finally float for function goto if implements import in instanceof int interface long native new null package private protected public return short static super switch synchronized this throw throws transient true try typeof var volatile void while with

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;

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http://davidwalsh.name/javascript-semicolons

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a = b + c (d + e).print()

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a = b + c(d + e).print();

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function add() { var a = 1, b = 2 return a + b }

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function add() { var a = 1, b = 2; return; a + b; }

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“Expose the good parts of JavaScript in a simple way”

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<>

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.js <>

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<>

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<>

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.js <>

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.js .coffee

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.js .coffee

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.js .coffee

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Compiler

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.js .coffee .litcoffee

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.js .coffee .litcoffee

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Publish via rsync ----------------- Publishing is nice and rudimentary. We build out an entirely static version of the site and **rysnc** it up to the server. Journo.publish = -> do Journo.build rsync 'site/images/', path.join(shared.config.publish, 'images/'), -> rsync 'site/', shared.config.publish A helper function for **rsync**ing, with logging, and the ability to wait for the rsync to continue before proceeding. This is useful for ensuring that our any new photos have finished uploading (very slowly) before the update to the feed is syndicated out. https://github.com/jashkenas/journo/blob/master/journo.litcoffee

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Usage

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Installation (v1.6.3)

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sudo npm install -g coffee-script Installation (v1.6.3)

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Executable $ coffee --compile file.coffee $ coffee --watch --compile --output js cs/*.coffee $ coffee -wco js cs $ coffee --map $ coffee --bare

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Interactive REPL $ coffee coffee> a = [1..3] a = [1..3] [ 1, 2, 3 ]

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Script tags

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Build tools

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Source maps

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Concepts

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It’s just JavaScript

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Readability Natural language

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Fast

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Backward compatible

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Sturdy

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Overview

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Whitespace sensitive user = name: "John" age: 23

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;

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Whitespace sensitive user = name: "John", age: 23; tasks = []

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var*

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*

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{}*

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*

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Whitespace sensitive user = name: "John" age: 23 try failwhale() catch e console.error e.message

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()*

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*

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Function invocation console.error e.message console.error JSON.stringify e console.error(e.message) console.error(JSON.stringify(e))

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Everything is an expression

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Work in every JavaScript runtime

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h p://try.coffeescript.io/

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Assignments

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name = "John" age = 23

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// Generated by CoffeeScript 1.3.3 (function() { var age, name; name = "John"; age = 23; }).call(this);

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Lexical Scope & variable safety

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function setA() { a = 1; } function setB() { var b = 2; } setA() console.log(a) # => 1 setB() console.log(b) # => ReferenceError: b is not defined

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Destructuring assignment

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[name, age] = ["John", 23]

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var age, name, _ref; _ref = ["John", 23], name = _ref[0], age = _ref[1];

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name = "John" user = {name} var name, user; name = "John"; user = { name: name };

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response = name: "John", email: "[email protected]", age: 23 {name, age} = response var age, name, response; response = { name: "John", email: "[email protected]", age: 23 }; name = response.name, age = response.age;

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try failwhale() catch {line, message} displayError "Error on line #{line}: #{message}" var line, message; try { failwhale(); } catch (_error) { line = _error.line, message = _error.message; displayError("Error on line " + line + ": " + message); }

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Comments

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# Somehow this causes problems: realAge = age / 0

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### Doomsday device Author: John Doe Last updated: 12.12.2012 ### /* Doomsday device Author: John Doe Last updated: 12.12.2012 */

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Arrays

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numbers = [14, 8, 15, 16, 23, 42]

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pixels = [ 255, 0, 255, 255 # first pixel 0, 0, 0, 0 # second pixel 255, 255, 0, 255 # third pixel ]

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users = [ name: "John" age: 23 , name: "Dirk" age: 45 ]

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var users; users = [ { name: "John", age: 23 }, { name: "Dirk", age: 45 } ];

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users = [{ name: "John" age: 23 }, { name: "Dirk" age: 45 }]

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Ranges

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numbers = [1..10] var numbers; numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];

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numbers = [1..100] var numbers, _i, _results; numbers = (function() { _results = []; for (_i = 1; _i <= 100; _i++){ _results.push(_i); } return _results; }).apply(this);

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numbers = [1..10] numbers[3..6] # => [4, 5, 6, 7] var numbers; numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]; numbers.slice(3, 7);

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numbers = [1..10] numbers[7..] # => [8, 9, 10] var numbers; numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]; numbers.slice(7);

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numbers = [1..10] numbers[..] # => [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] var numbers; numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]; console.log(numbers.slice(0));

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Objects

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user = {name: "John", age: "John"}

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user = name: "John", age: "John"

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users = name: "John" age: 23

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users = name: first: "John" last: "Doe" age: 23 hobbies: []

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$('#logo').attr class: 'bigger' $('#logo').attr({ "class": 'bigger' });

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console.log animal.class console.log(animal["class"]);

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Strings

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firstName = "John" lastName = 'Doe' var firstName, lastName; firstName = "John"; lastName = 'Doe';

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Interpolation

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greeting = "Welcome back, #{name}" var greeting; greeting = "Welcome back, " + name;

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greeting = "#{30 - user.age} years until 30!" var greeting; greeting = "" + (30 - user.age) + " years until 30!";

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age = 27 ageString = "#{age}" var age, ageString; age = 27; ageString = "" + age;

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Multiline strings

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story = "Some people go batshit crazy if your code exceeds 80 columns per line so yo better just don't do." var story; story = "Some people go batshit crazy if your code ↵ execeds 80 columns per line so yo better just don't ↵ do.";

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Block strings

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headerMarkup = """

XML is like violence

""" var headerMarkup; headerMarkup = "\n

XML is like ↵ violence

\n";

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Regular expressions

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mastercard = /5[1-5][0-9]{14}/ var mastercard; mastercard = /^5[1-5][0-9]{14}$/;

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mastercard = /// ^ 5[1-5] # starts with 51..55 [0-9]{14} # 14 more digits $ /// var mastercard; mastercard = /^5[1-5][0-9]{14}$/;

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Functions

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function fullName(user) { return user.firstName + ' ' + user.lastName; } var fullName = function(user) { return user.firstName + ' ' + user.lastName; }

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fullName(user); function fullName(user) { return user.firstName + ' ' + user.lastName; } "John Doe"

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fullName(user); var fullName = function(user) { return user.firstName + ' ' + user.lastName; } TypeError: undefined is not a function

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functionName = -> functionBody functionName = -> functionBody

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functionName = -> functionBody functionName = -> functionBody

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var functionName; functionName = function() { return functionBody; };

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Invocation

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outer inner outer(inner) outer inner 'foo', 'bar' wrap outer inner core outer(inner); outer(inner); outer(inner('foo', 'bar')); wrap(outer(inner(core)));

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Arguments

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fullName = (firstName, lastName) -> "#{firstName} #{lastName}"

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Default values

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fullName = (firstName, lastName = "Doe") -> "#{firstName} #{lastName}"

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var fullName; fullName = function(firstName, lastName) { if (lastName == null) { lastName = "Doe"; } return "" + firstName + " " + lastName; };

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Splats

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invited = (names...) -> "Invited: #{names.join(', ')}" invited "John", "Mary", "The boy"

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var invited, __slice = [].slice; invited = function() { var names; names = 1 <= arguments.length ? ↵ __slice.call(arguments, 0) : []; return "Invited: " + (names.join(', ')); };

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Closures

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makeAdder = (x) -> (y) -> x + y add5 = makeAdder(5) add5(10) # => 15 var makeAdder; makeAdder = function(x) { return function(y) { return x + y; }; };

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do -> do (argument) -> (function() {})(); (function(argument) {})(argument);

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Conditionals

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if name == 'John' console.log "It's John again." else if name == 'Marcy' console.log "It's Marcy this time." else console.log "It's not John." unless name == 'John' console.log "It's someone else"

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if (name === 'John') { console.log("It's John again."); } else if (name === 'Marcy') { console.log("It's Marcy this time."); } else { console.log("It's not John."); } if (name !== 'John') { console.log("It's someone else"); }

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if name == 'John' then console.log "It's John again."

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Postfix

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console.log "It's John again." if name == 'John' console.log "It's someone else" unless name == 'John'

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Everything’s an expression

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message = if name == 'John' "It's John again." else if name == 'Marcy' "It's Marcy this time." else "It's not John." console.log message

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message = if name == 'John' then "It's John again." else if name == 'Marcy' then "It's Marcy this time." else "It's not John." console.log message

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[lastName, age] = if name == 'John' then ['Doe', 23] else if name == 'Marcy' then ['Murcy', 29] else ['Unknown' ] console.log lastName, age

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Ternary

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var isJohn = name == 'John' ? 'yep' : 'nope';

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isJohn = if name == 'John' then 'yep' else 'nope'

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var isJohn; isJohn = name === 'John' ? 'yep' : 'nope';

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(›°□°ʣ›ớ ᵲᴸᵲ

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“I realize its slightly longer, but less cryptic, I hope.” — Jeremy Ashkenas

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Operators and aliases

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isJohn = if name is 'John' then 'yep' else 'nope'

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is === isnt !== not ! and && or || true, yes, on true false, no, off false @, this this of in in

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is === isnt !== not ! and && or || true, yes, on true false, no, off false @, this this of in in

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is === isnt !== not ! and && or || true, yes, on true false, no, off false @, this this of in in

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letIn() if name in ['John', 'Marcy']

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letIn() if name in ['John', 'Marcy'] if (name === 'John' || name === 'Marcy') { letIn(); }

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Existential operator

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invite(user) if user?

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if (typeof user !== "undefined" && user !== null) { invite(user); }

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name = userName ? 'John' var name; name = typeof userName !== "undefined" && ↵ userName !== null ? userName : 'John';

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name = 'John' name ?= 'Marcy' var name; name = 'John'; if (name == null) { name = 'Marcy'; }

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name = 'Marcy Murcy' john = name.match(/John/)?[0] var john, name, _ref; name = 'Marcy Murcy'; john = (_ref = name.match(/John/)) != null ? ↵ _ref[0] : void 0;

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console?.log? "foo" if (typeof console !== "undefined" && console !== null) { if (typeof console.log === "function") { console.log("foo"); } }

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Loops and list comprehension

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Lists

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names = ['John', 'Marcy'] for name in names invite(name)

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invite(name) for name in ['John', 'Marcy']

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var name, _i, _len, _ref; _ref = ['John', 'Marcy']; for (_i = 0, _len = _ref.length; _i < _len; _i++) { name = _ref[_i]; invite(name); }

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invite(name, index) for name, index in ['John', 'Marcy']

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Conditional

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invite(n) for n in ['John', 'Marcy'] when n is 'John'

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Comprehension

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johns = (n for n in ['John', 'Marcy'] when n is 'John')

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var johns, n; johns = (function() { var _i, _len, _ref, _results; _ref = ['John', 'Marcy']; _results = []; for (_i = 0, _len = _ref.length; _i < _len; _i++) { n = _ref[_i]; if (n === 'John') { _results.push(n); } } return _results; })();

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Steps

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evenNumbers = (n for n in [0..10] by 2)

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Objects

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users = john: 23, marcy: 29 ageReport = for name, age of users "#{name} is #{age}"

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var age, ageReport, name, users; users = { john: 23, marcy: 29 }; ageReport = (function() { var _results; _results = []; for (name in users) { age = users[name]; _results.push("" + name + " is " + age); } return _results; })();

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users = john: 23, marcy: 29 ageReport = for own name, age of users "#{name} is #{age}"

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var age, ageReport, name, users, __hasProp = {}.hasOwnProperty; users = { john: 23, marcy: 29 }; ageReport = (function() { var _results; _results = []; for (name in users) { if (!__hasProp.call(users, name)) continue; age = users[name]; _results.push("" + name + " is " + age); } return _results; })();

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while and until

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growUp(user) while user.age < 80 growUp(user) until user.age >= 80

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loop -> poll() while (true) { (function() { return poll(); }); }

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Classes and inheritance

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class User

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var User; User = (function() { function User() {} return User; })();

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Constructor

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class User constructor: (name) -> @name = name

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var User; User = (function() { function User(name) { this.name = name; } return User; })();

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class User constructor: (@name) ->

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class User constructor: (@name = 'Undefined') ->

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Instance methods

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class User constructor: (@firstName, @lastName) -> fullName: -> "#{@firstName} #{@lastName}" john = new User('John', 'Doe') john.fullName() # => "John Doe"

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var User, john; User = (function() { function User(firstName, lastName) { this.firstName = firstName; this.lastName = lastName; } User.prototype.fullName = function() { return "" + this.firstName + " " + this.lastName; }; return User; })();

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Binding of this

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class View constructor: (@name)-> $('a').on 'click', displayName displayName: => $('h1').text @name

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Instance variables

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class User constructor: -> @invited = false

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Class methods (and variables)

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class User @_users: [] @getUsers: -> User._users

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var User; User = (function() { function User() {} User._users = []; User.getUsers = function() { return User._users; }; return User; })();

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Inheritance

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class User class Invitee extends User

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var Invitee, User, _ref, __hasProp = {}.hasOwnProperty, __extends = function(child, parent) { for (var key in parent) { if (__hasProp.call(parent, key)) child[key] = parent[key]; } function ctor() { this.constructor = child; } ctor.prototype = parent.prototype; child.prototype = new ctor(); child.__super__ = parent.prototype; return child; }; User = (function() { function User() {} return User; })(); Invitee = (function(_super) { __extends(Invitee, _super); function Invitee() { _ref = Invitee.__super__.constructor.apply(this, arguments); return _ref; } return Invitee; })(User);

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var Invitee, User, _ref, __hasProp = {}.hasOwnProperty, __extends = function(child, parent) { for (var key in parent) { if (__hasProp.call(parent, key)) child[key] = parent[key]; } function ctor() { this.constructor = child; } ctor.prototype = parent.prototype; child.prototype = new ctor(); child.__super__ = parent.prototype; return child; }; User = (function() { function User() {} return User; })(); Invitee = (function(_super) { __extends(Invitee, _super); function Invitee() { _ref = Invitee.__super__.constructor.apply(this, arguments); return _ref; } return Invitee; })(User);

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var Invitee, User, _ref, __hasProp = {}.hasOwnProperty, __extends = function (child, parent) { for (var key in parent) { if (__hasProp.call(parent, key)) { child[key] = parent[key]; } } function ctor() { this.constructor = child; } ctor.prototype = parent.prototype; child.prototype = new ctor(); child.__super__ = parent.prototype; return child; };

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User = (function() { function User() {} return User; })();

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Invitee = (function(_super) { __extends(Invitee, _super); function Invitee() { _ref = Invitee.__super__.constructor.apply(this, ↵ arguments); return _ref; } return Invitee; })(User);

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Super

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class User constructor: (@name) -> message: -> "Hello #{@name}!" class Invitee extends User message: -> "#{super()} You are invited" invitee = new Invitee 'John' invitee.message() # => "Hello John! You are invited"

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Invitee.prototype.message = function() { return "" + (Invitee.__super__.message.call(this)) ↵ + " You are invited"; };

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Direct prototype access

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String::dasherize = -> this.replace /_/g, "-" String.prototype.dasherize = function() { return this.replace(/_/g, "-"); };

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Summary

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CoffeeScript makes Javascript fun again

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Common complaints

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Teamwork

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Debugging

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WORKSHOP!