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Let's Have a Cup of CoffeeScript

Let's Have a Cup of CoffeeScript

A run through a lot of features CoffeeScript offers to ease your JavaScript development.

Nicolás Sanguinetti

September 26, 2011
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  1. me = { name: “Nicolás”, location: “Montevideo, Uruguay”, age: 26,

    likesWorkingOn: [“Ruby”, “JavaScript”], twitter: “@godfoca”, github: “http://github.com/foca”, url: “http://nicolassanguinetti.info”, company: { name: “Cubox”, url: “http://cuboxsa.com” } }
  2. me = { name: “Nicolás”, location: “Montevideo, Uruguay age: 26,

    likesWorkingOn: [“Ruby”, “Java twitter: “@godfoca”, github: “http://github.com/foc url: “http://nicolassanguinett company: { name: “Cubox”, url: “http://cuboxsa.com”
  3. me = { name: “Nicolás”, location: “Montevid age: 26, likesWorkingOn:

    [“R twitter: “@godfoca” github: “http://git
  4. me = { name: “Nicolás”, location: “Montevideo, Uruguay”, age: 26,

    likesWorkingOn: [“Ruby”, “JavaScript”], twitter: “@godfoca”, github: “http://github.com/foca”, url: “http://nicolassanguinetti.info”, company: { name: “Cubox”, url: “http://cuboxsa.com” } }
  5. me = { name: “Nicolás”, location: “Montevideo, Uruguay”, age: 26,

    likesWorkingOn: [“Ruby”, “JavaScript”], twitter: “@godfoca”, github: “http://github.com/foca”, url: “http://nicolassanguinetti.info”, company: { name: “Cubox”, url: “http://cuboxsa.com” } }
  6. me = name: “Nicolás”, location: “Montevideo, Uruguay”, age: 26, likesWorkingOn:

    [“Ruby”, “JavaScript”], twitter: “@godfoca”, github: “http://github.com/foca”, url: “http://nicolassanguinetti.info”, company: name: “Cubox”, url: “http://cuboxsa.com”
  7. me = name: “Nicolás”, location: “Montevideo, Uruguay”, age: 26, likesWorkingOn:

    [“Ruby”, “JavaScript”], twitter: “@godfoca”, github: “http://github.com/foca”, url: “http://nicolassanguinetti.info”, company: name: “Cubox”, url: “http://cuboxsa.com”
  8. me = name: “Nicolás”, location: “Montevideo, Uruguay”, age: 26, likesWorkingOn:

    [“Ruby”, “JavaScript”], twitter: “@godfoca”, github: “http://github.com/foca”, url: “http://nicolassanguinetti.info”, company: name: “Cubox”, url: “http://cuboxsa.com”
  9. me = name: “Nicolás” location: “Montevideo, Uruguay” age: 26 likesWorkingOn:

    [“Ruby”, “JavaScript”] twitter: “@godfoca” github: “http://github.com/foca” url: “http://nicolassanguinetti.info” company: name: “Cubox” url: “http://cuboxsa.com”
  10. me = name: “Nicolás” location: “Montevideo, Uruguay” age: 26 likesWorkingOn:

    [“Ruby”, “JavaScript”] twitter: “@godfoca” github: “http://github.com/foca” url: “http://nicolassanguinetti.info” company: name: “Cubox” url: “http://cuboxsa.com”
  11. var square = function(num) { return num * num; }

    var list = [1, 2, 3, 4, 5]; var squares = []; for (var i = 0; i < list.length; i++) { squares.push(square(list[i])); } 1st Cup: A simple comparison
  12. var square = function(num) { return num * num; }

    var list = [1, 2, 3, 4, 5]; var squares = []; for (var i = 0; i < list.length; i++) { squares.push(square(list[i])); } 1st Cup: A simple comparison
  13. var square = function(num) { return num * num; }

    var list = [1, 2, 3, 4, 5]; var squares = []; for (var i = 0; i < list.length; i++) { squares.push(square(list[i])); } 1st Cup: A simple comparison
  14. var square = function(num) { return num * num; }

    var list = [1, 2, 3, 4, 5]; var squares = []; for (var i = 0; i < list.length; i++) { squares.push(square(list[i])); } 1st Cup: A simple comparison
  15. var square = function(num) { return num * num; }

    var list = [1, 2, 3, 4, 5]; var squares = []; for (var i = 0; i < list.length; i++) { squares.push(square(list[i])); } 1st Cup: A simple comparison
  16. square = (num) -> num * num list = [1..5]

    squares = (square n for n in list) 1st Cup: A simple comparison
  17. square = (num) -> num * num list = [1..5]

    squares = (square n for n in list) 1st Cup: A simple comparison
  18. square = (num) -> num * num list = [1..5]

    squares = (square n for n in list) 1st Cup: A simple comparison
  19. square = (num) -> num * num list = [1..5]

    squares = (square n for n in list) 1st Cup: A simple comparison
  20. square = (num) -> num * num list = [1..5]

    squares = (square n for n in list) 1st Cup: A simple comparison
  21. var add = function(x, y) { return x + “

    + “ + y + “ = “ + (x + y); } console.log(add(2, 3)) > 2 + 3 = 5 console.log(add(5, 7)) > 5 + 7 = 12 2nd Cup: The Useless Calculator
  22. var add = function(x, y) { return x + “

    + “ + y + “ = “ + (x + y); } console.log(add(2, 3)) > 2 + 3 = 5 console.log(add(5, 7)) > 5 + 7 = 12 2nd Cup: The Useless Calculator
  23. var add = function(x, y) { return x + “

    + “ + y + “ = “ + (x + y); } console.log(add(2, 3)) > 2 + 3 = 5 console.log(add(5, 7)) > 5 + 7 = 12 2nd Cup: The Useless Calculator
  24. var add = function(x, y) { return x + “

    + “ + y + “ = “ + (x + y); } console.log(add(2, 3)) > 2 + 3 = 5 console.log(add(5, 7)) > 5 + 7 = 12 2nd Cup: The Useless Calculator
  25. var add = function(x, y) { return x + “

    + “ + y + “ = “ + (x + y); } console.log(add(2, 3)) > 2 + 3 = 5 console.log(add(5, 7)) > 5 + 7 = 12 2nd Cup: The Useless Calculator
  26. add = (x, y) -> “#{x} + #{y} = #{x

    + y}” console.log add(2, 3) > 2 + 3 = 5 console.log add(5, 7) > 5 + 7 = 12 2nd Cup: The Useless Calculator
  27. add = (x, y) -> “#{x} + #{y} = #{x

    + y}” console.log add(2, 3) > 2 + 3 = 5 console.log add(5, 7) > 5 + 7 = 12 2nd Cup: The Useless Calculator
  28. add = (x, y) -> “#{x} + #{y} = #{x

    + y}” console.log add(2, 3) > 2 + 3 = 5 console.log add(5, 7) > 5 + 7 = 12 2nd Cup: The Useless Calculator
  29. add = (x, y) -> “#{x} + #{y} = #{x

    + y}” console.log add(2, 3) > 2 + 3 = 5 console.log add(5, 7) > 5 + 7 = 12 2nd Cup: The Useless Calculator
  30. add = (x, y) -> “#{x} + #{y} = #{x

    + y}” console.log add(2, 3) > 2 + 3 = 5 console.log add(5, 7) > 5 + 7 = 12 2nd Cup: The Useless Calculator
  31. languageOfChoice = (lang) -> if lang == “PHP” “Get outta

    here!” else “#{lang} rocks!” Implicit Return 3rd Cup: Your Favorite Language
  32. languageOfChoice = (lang) -> if lang == “PHP” return “Get

    outta here!” else return “#{lang} rocks!” Implicit Return 3rd Cup: Your Favorite Language
  33. languageOfChoice = (lang = “Ruby”) -> “#{lang} rocks!” console.log languageOfChoice(“Lua”)

    > Lua rocks! console.log languageOfChoice() > Ruby rocks! Default Arguments 3rd Cup: Your Favorite Language
  34. languageOfChoice = (lang = “Ruby”) -> “#{lang} rocks!” console.log languageOfChoice

    “Lua” > Lua rocks! Optional Parentheses 3rd Cup: Your Favorite Language
  35. languageOfChoice = (lang = “Ruby”) -> “#{lang} rocks!” console.log languageOfChoice

    “Lua” > Lua rocks! console.log languageOfChoice Optional Parentheses 3rd Cup: Your Favorite Language
  36. languageOfChoice = (lang = “Ruby”) -> “#{lang} rocks!” console.log languageOfChoice

    “Lua” > Lua rocks! console.log languageOfChoice > [Function] Optional Parentheses 3rd Cup: Your Favorite Language
  37. languageOfChoice = (lang = “Ruby”) -> “#{lang} rocks!” console.log languageOfChoice

    “Lua” > Lua rocks! console.log languageOfChoice > [Function] console.log languageOfChoice() > Ruby rocks! Optional Parentheses 3rd Cup: Your Favorite Language
  38. Splats languagesOfChoice = (langs...) -> “I like #{langs.join(“, “)}” languagesOfChoice

    “Ruby”, “JS”, “Python” > I like Ruby, JS, Python 3rd Cup: Your Favorite Language
  39. Splats languagesOfChoice = (best, langs...) -> “I love #{best}, and

    I like #{langs.join(“, “)}” 3rd Cup: Your Favorite Language
  40. Splats languagesOfChoice = (best, langs...) -> “I love #{best}, and

    I like #{langs.join(“, “)}” languagesOfChoice “Ruby”, “JS”, “Python” > I love Ruby, and I like JS, Python 3rd Cup: Your Favorite Language
  41. Splats languagesOfChoice = (langs..., worst) -> “I like #{langs.join(“, “)},

    but I hate #{worst}” 3rd Cup: Your Favorite Language
  42. Splats languagesOfChoice = (langs..., worst) -> “I like #{langs.join(“, “)},

    but I hate #{worst}” languagesOfChoice “Ruby”, “JS”, “PHP” > I like Ruby, JS, but I hate PHP 3rd Cup: Your Favorite Language
  43. list = [“Ruby”, “JS”, “Python”] first_two = list[0..1] first_two #=>

    [“Ruby”, “JS”] 4th Cup: Getting Inside Your Objects Tasty Slices
  44. list = [“Ruby”, “JS”, “Python”] last_two = list[1..-1] last_two #=>

    [“JS”, “Python”] 4th Cup: Getting Inside Your Objects Tasty Slices
  45. list = [“Ruby”, “JS”, “Python”] head = list[0] tail =

    list[1..-1] 4th Cup: Getting Inside Your Objects
  46. list = [“Ruby”, “JS”, “Python”] [head, tail] = [list[0], list[1..-1]]

    Pattern Matching 4th Cup: Getting Inside Your Objects
  47. list = [“Ruby”, “JS”, “Python”] [head, tail] = [list[0], list[1..-1]]

    Pattern Pattern Matching 4th Cup: Getting Inside Your Objects
  48. list = [“Ruby”, “JS”, “Python”] [head, tail] = [list[0], list[1..-1]]

    Values Pattern Matching 4th Cup: Getting Inside Your Objects Pattern
  49. list = [“Ruby”, “JS”, “Python”] [head, tail] = [list[0], list[1..-1]]

    Values Pattern Matching 4th Cup: Getting Inside Your Objects Variables
  50. list = [“Ruby”, “JS”, “Python”] [head, tail] = [list[0], list[1..-1]]

    Pattern Matching 4th Cup: Getting Inside Your Objects
  51. list = [“Ruby”, “JS”, “Python”] [head, tail] = [list[0], list[1..-1]]

    Pattern Matching 4th Cup: Getting Inside Your Objects
  52. list = [“Ruby”, “JS”, “Python”] [head, tail] = [list[0], list[1..-1]]

    head #=> “Ruby” Pattern Matching 4th Cup: Getting Inside Your Objects
  53. list = [“Ruby”, “JS”, “Python”] [head, tail] = [list[0], list[1..-1]]

    head #=> “Ruby” tail #=> [“JS”, “Python”] Pattern Matching 4th Cup: Getting Inside Your Objects
  54. list = [“Ruby”, “JS”, “Python”] [head, tail...] = list head

    #=> “Ruby” Pattern Matching 4th Cup: Getting Inside Your Objects
  55. list = [“Ruby”, “JS”, “Python”] [head, tail...] = list head

    #=> “Ruby” tail #=> [“JS”, “Python”] Pattern Matching 4th Cup: Getting Inside Your Objects
  56. list = [“Ruby”, “JS”, “Python”] [top, rest..., bottom] = list

    Pattern Matching 4th Cup: Getting Inside Your Objects
  57. list = [“Ruby”, “JS”, “Python”] [top, rest..., bottom] = list

    top #=> “Ruby” Pattern Matching 4th Cup: Getting Inside Your Objects
  58. list = [“Ruby”, “JS”, “Python”] [top, rest..., bottom] = list

    top #=> “Ruby” bottom #=> “Python” Pattern Matching 4th Cup: Getting Inside Your Objects
  59. list = [“Ruby”, “JS”, “Python”] [top, rest..., bottom] = list

    top #=> “Ruby” bottom #=> “Python” rest #=> [“JS”] Pattern Matching 4th Cup: Getting Inside Your Objects
  60. list = [“Ruby”, “JS”] [top, rest..., bottom] = list Pattern

    Matching 4th Cup: Getting Inside Your Objects
  61. list = [“Ruby”, “JS”] [top, rest..., bottom] = list top

    #=> “Ruby” Pattern Matching 4th Cup: Getting Inside Your Objects
  62. list = [“Ruby”, “JS”] [top, rest..., bottom] = list top

    #=> “Ruby” bottom #=> “JS” Pattern Matching 4th Cup: Getting Inside Your Objects
  63. list = [“Ruby”, “JS”] [top, rest..., bottom] = list top

    #=> “Ruby” bottom #=> “JS” rest #=> [] Pattern Matching 4th Cup: Getting Inside Your Objects
  64. me = name: “Nicolás” company: “Cubox” name = me.name company

    = me.company Pattern Matching 4th Cup: Getting Inside Your Objects
  65. me = name: “Nicolás” company: “Cubox” { name: name, company:

    company } = me Pattern Matching 4th Cup: Getting Inside Your Objects
  66. me = name: “Nicolás” company: “Cubox” { name: name, company:

    company } = me Pattern Pattern Matching 4th Cup: Getting Inside Your Objects
  67. Pattern Matching 4th Cup: Getting Inside Your Objects me =

    name: “Nicolás” company: “Cubox” { name: name, company: company } = me Variables
  68. me = name: “Nicolás” company: “Cubox” { name: name, company:

    company } = me Values Pattern Matching 4th Cup: Getting Inside Your Objects
  69. me = name: “Nicolás” company: “Cubox” { name: name, company:

    company } = me name #=> “Nicolás” company #=> “Cubox” Pattern Matching 4th Cup: Getting Inside Your Objects
  70. { name, company } = me name #=> “Nicolás” Pattern

    Matching 4th Cup: Getting Inside Your Objects
  71. { name, company } = me name #=> “Nicolás” company

    #=> 26 Pattern Matching 4th Cup: Getting Inside Your Objects
  72. list = [1..10] for item in list doSomethingWith(item) 5th Cup:

    Collecting Collections Iterating over arrays
  73. me = name: “Nicolás”, age: 26 for key, value of

    me console.log “#{key}: #{value}” Iterating over objects 5th Cup: Collecting Collections
  74. me = name: “Nicolás”, age: 26 for key, value of

    me console.log “#{key}: #{value}” Iterating over objects 5th Cup: Collecting Collections
  75. doubles = (n * 2 for n in [1..5]) 5th

    Cup: Collecting Collections Comprehensions
  76. n * 2 for n in [1..5] when n >

    2 Filtering Comprehensions 5th Cup: Collecting Collections
  77. n * 2 for n in [1..5] when n >

    2 Filtering Comprehensions 5th Cup: Collecting Collections
  78. n * 2 for n in [1..5] when n >

    2 for n in [1..5] continue unless n > 2 n * 2 Filtering Comprehensions 5th Cup: Collecting Collections
  79. n * 2 for n in [1..5] when n >

    2 for n in [1..5] continue unless n > 2 n * 2 Filtering Comprehensions 5th Cup: Collecting Collections
  80. User = (id, name) -> this.id = id this.name =

    name this.element = $(“#user-#{this.id}”) 6th Cup: Context, the classy way
  81. Context Accessor 6th Cup: Context, the classy way User =

    (id, name) -> this.id = id this.name = name this.element = $(“#user-#{this.id}”)
  82. Context Accessor 6th Cup: Context, the classy way User =

    (id, name) -> this.id = id this.name = name this.element = $(“#user-#{this.id}”)
  83. Context Accessor 6th Cup: Context, the classy way User =

    (id, name) -> this.id = id this.name = name this.element = $(“#user-#{this.id}”)
  84. Context Accessor 6th Cup: Context, the classy way User =

    (id, name) -> this.id = id this.name = name this.element = $(“#user-#{this.id}”)
  85. User = (id, name) -> @id = id @name =

    name @element = $(“#user-#{@id}”) Context Accessor 6th Cup: Context, the classy way
  86. Property Arguments 6th Cup: Context, the classy way User =

    (id, name) -> @id = id @name = name @element = $(“#user-#{@id}”)
  87. User = (id, name) -> @id = id @name =

    name @element = $(“#user-#{@id}”) Property Arguments 6th Cup: Context, the classy way
  88. Property Arguments 6th Cup: Context, the classy way User =

    (@id, @name) -> @element = $(“#user-#{@id}”)
  89. Property Arguments 6th Cup: Context, the classy way User =

    (@id, @name) -> @element = $(“#user-#{@id}”)
  90. User = (@id, @name) -> @element = $(“#user-#{@id}”) User.prototype.signOut =

    -> $.ajax(...) Bound Functions 6th Cup: Context, the classy way
  91. User = (@id, @name) -> @element = $(“#user-#{@id}”) User.prototype.signOut =

    -> $.ajax(...) Bound Functions 6th Cup: Context, the classy way
  92. User = (@id, @name) -> @element = $(“#user-#{@id}”) User.prototype.signOut =

    -> $.ajax(...) Bound Functions 6th Cup: Context, the classy way
  93. User = (@id, @name) -> @element = $(“#user-#{@id}”) $(“a.sign-out”, @element).click

    -> this.signOut() false User.prototype.signOut = -> $.ajax(...) Bound Functions 6th Cup: Context, the classy way
  94. User = (@id, @name) -> @element = $(“#user-#{@id}”) $(“a.sign-out”, @element).click

    -> this.signOut() false User.prototype.signOut = -> $.ajax(...) Bound Functions 6th Cup: Context, the classy way
  95. User = (@id, @name) -> @element = $(“#user-#{@id}”) $(“a.sign-out”, @element).click

    -> this.signOut() false User.prototype.signOut = -> $.ajax(...) Bound Functions 6th Cup: Context, the classy way
  96. User = (@id, @name) -> @element = $(“#user-#{@id}”) self =

    this $(“a.sign-out”, @element).click -> self.signOut() false User.prototype.signOut = -> $.ajax(...) Bound Functions 6th Cup: Context, the classy way
  97. User = (@id, @name) -> @element = $(“#user-#{@id}”) self =

    this $(“a.sign-out”, @element).click -> self.signOut() false User.prototype.signOut = -> $.ajax(...) Bound Functions 6th Cup: Context, the classy way
  98. User = (@id, @name) -> @element = $(“#user-#{@id}”) $(“a.sign-out”, @element).click

    => this.signOut() false User.prototype.signOut = -> $.ajax(...) Bound Functions 6th Cup: Context, the classy way
  99. User = (@id, @name) -> @element = $(“#user-#{@id}”) $(“a.sign-out”, @element).click

    => this.signOut() false User.prototype.signOut = -> $.ajax(...) Bound Functions 6th Cup: Context, the classy way
  100. User = (@id, @name) -> @element = $(“#user-#{@id}”) $(“a.sign-out”, @element).click

    => this.signOut() false User.prototype.signOut = -> $.ajax(...) Bound Functions 6th Cup: Context, the classy way
  101. 6th Cup: Context, the classy way Classes class User constructor:

    (@id, @name) -> @element = $(“#user-#{@id}”) signOut: -> ...
  102. 6th Cup: Context, the classy way Classes class User constructor:

    (@id, @name) -> @element = $(“#user-#{@id}”) signOut: -> ...
  103. 6th Cup: Context, the classy way Classes class User constructor:

    (@id, @name) -> @element = $(“#user-#{@id}”) signOut: -> ...
  104. 6th Cup: Context, the classy way Inheritance class User constructor:

    (@id, @name) -> @element = $(“#user-#{@id}”) signOut: -> ...
  105. 6th Cup: Context, the classy way Inheritance class SignedInUser extends

    User ... class SignedOutUser extends User ...
  106. 6th Cup: Context, the classy way super class SignedInUser extends

    User constructor: (args...) -> super args... $(“a.sign-out”, @element).click => this.signOut()
  107. class User constructor: (@id, @name) -> @element = $(“#user-#{@id}”) signOut:

    -> ... 6th Cup: Context, the classy way On variable locality
  108. class window.User constructor: (@id, @name) -> @element = $(“#user-#{@id}”) signOut:

    -> ... 6th Cup: Context, the classy way On variable locality
  109. class window.User constructor: (@id, @name) -> @element = $(“#user-#{@id}”) signOut:

    -> ... 6th Cup: Context, the classy way On variable locality
  110. class this.User constructor: (@id, @name) -> @element = $(“#user-#{@id}”) signOut:

    -> ... 6th Cup: Context, the classy way On variable locality
  111. class @User constructor: (@id, @name) -> @element = $(“#user-#{@id}”) signOut:

    -> ... 6th Cup: Context, the classy way On variable locality
  112. We’ve Covered ➡ Object Literals ➡ String Interpolation ➡ Functions

    ➡ Default Arguments ➡ Splats ➡ Ranges ➡ Pattern Matching ➡ Context and this ➡ Property Accessors ➡ Bound Functions ➡ Classes ➡ Inheritance ➡ super
  113. languagesOfChoice = (best, langs...) -> “I love #{best}, and I

    like #{langs.join(“, “)}” Follow-up: Existential Operator
  114. languagesOfChoice = (best, langs...) -> “I love #{best}, and I

    like #{langs.join(“, “)}” languagesOfChoice “Ruby” > I love Ruby, and I like Follow-up: Existential Operator
  115. languagesOfChoice = (best, langs...) -> “I love #{best}, and I

    like #{langs.join(“, “)}” languagesOfChoice “Ruby” > I love Ruby, and I like languagesOfChoice() > I love , and I like Follow-up: Existential Operator
  116. Follow-up: Existential Operator languagesOfChoice = (best, langs...) -> ret =

    [] if best? ret.push “I love #{best}” if langs.length > 0 ret.push “I like #{langs.join(“, “)}” ret.join(“, and “)
  117. languagesOfChoice = (best, langs...) -> ret = [] if best?

    ret.push “I love #{best}” if langs.length > 0 ret.push “I like #{langs.join(“, “)}” ret.join(“, and “) Follow-up: Existential Operator
  118. languagesOfChoice = (best, langs...) -> ret = [] if best?

    ret.push “I love #{best}” if langs.length > 0 ret.push “I like #{langs.join(“, “)}” ret.join(“, and “) Follow-up: Existential Operator
  119. languagesOfChoice = (best, langs...) -> ret = [] if best?

    ret.push “I love #{best}” if langs.length > 0 ret.push “I like #{langs.join(“, “)}” ret.join(“, and “) Follow-up: Existential Operator
  120. languagesOfChoice = (best, langs...) -> ret = [] if best?

    ret.push “I love #{best}” if langs.length > 0 ret.push “I like #{langs.join(“, “)}” ret.join(“, and “) Follow-up: Existential Operator
  121. languagesOfChoice “Ruby”, “JS”, “Python” > I love Ruby, and I

    like JS, Python Follow-up: Existential Operator
  122. languagesOfChoice “Ruby”, “JS”, “Python” > I love Ruby, and I

    like JS, Python languagesOfChoice “Ruby” > I love Ruby Follow-up: Existential Operator
  123. languagesOfChoice “Ruby”, “JS”, “Python” > I love Ruby, and I

    like JS, Python languagesOfChoice “Ruby” > I love Ruby languagesOfChoice undefined, “Ruby”, “JS” > I like Ruby, JS Follow-up: Existential Operator
  124. languagesOfChoice “Ruby”, “JS”, “Python” > I love Ruby, and I

    like JS, Python languagesOfChoice “Ruby” > I love Ruby languagesOfChoice undefined, “Ruby”, “JS” > I like Ruby, JS languagesOfChoice() > “” Follow-up: Existential Operator
  125. obj = x: { y: 2 } obj.x?.y if obj.x?

    then obj.x.y else undefined Follow-up: Existential Operator
  126. obj = x: { y: 2 } obj.x?.y if obj.x?

    then obj.x.y else undefined Follow-up: Existential Operator
  127. obj = x: { y: 2 } obj.x?.y if obj.x?

    then obj.x.y else undefined Follow-up: Existential Operator
  128. obj = x: { y: 2 } obj.x?.y if obj.x?

    then obj.x.y else undefined Follow-up: Existential Operator
  129. for i in [1..5] setTimeout (-> console.log i), 100 >

    5 > 5 > 5 > 5 > 5 Follow-up: Loop closures and do
  130. for i in [1..5] setTimeout (-> console.log i), 100 >

    5 > 5 > 5 > 5 > 5 Follow-up: Loop closures and do
  131. for i in [1..5] ((i) -> setTimeout (-> console.log i),

    100 )(i) > 1 > 2 > ... Follow-up: Loop closures and do
  132. for i in [1..5] do (i) -> setTimeout (-> console.log

    i), 100 > 1 > 2 > ... Follow-up: Loop closures and do
  133. A = [1, 2, 3, 4, 5] B = [8,

    7, 1, 2] cartesian = ([x, y] for x in A for y in B) Keep It Simple, Stupid Follow-up: Comprehension Madness
  134. (ret.push(val) unless val in ret) for val in orig when

    shouldAdd(val) Keep It Simple, Stupid Follow-up: Comprehension Madness