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Let’s Have a Cup of

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JavaScript

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JavaScript

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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” } }

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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”

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me = { name: “Nicolás”, location: “Montevid age: 26, likesWorkingOn: [“R twitter: “@godfoca” github: “http://git

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me = { name: “Nicolás” location: “Mont age: 26, likesWorkingOn: twitter: “@godf

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= { name: “Nico location: “ age: 26, me There’s no var

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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” } }

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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” } }

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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”

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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”

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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”

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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”

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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”

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Let’s Have a Cup of

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Let’s Have a Cup (or six) of

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1st Cup A simple comparison

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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

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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

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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

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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

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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

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

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

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

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

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

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2nd Cup The Useless Calculator

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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3rd Cup Your Favorite Language

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languageOfChoice = (lang) -> “#{lang} rocks!” 3rd Cup: Your Favorite Language

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languageOfChoice = (lang) -> “#{lang} rocks!” 3rd Cup: Your Favorite Language

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languageOfChoice = (lang) -> “#{lang} rocks!” 3rd Cup: Your Favorite Language

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languageOfChoice = (lang) -> “#{lang} rocks!” 3rd Cup: Your Favorite Language

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

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languageOfChoice = (lang) -> “#{lang} rocks!” Implicit Return 3rd Cup: Your Favorite Language

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languageOfChoice = (lang) -> return “#{lang} rocks!” Implicit Return 3rd Cup: Your Favorite Language

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

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

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

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

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

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

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

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

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

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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

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

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

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Splats myLangs = [“Ruby”, “JS”, “Python”] 3rd Cup: Your Favorite Language

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Splats myLangs = [“Ruby”, “JS”, “Python”] languagesOfChoice myLangs... > I like Ruby, JS, Python 3rd Cup: Your Favorite Language

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

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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

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

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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

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4th Cup Getting Inside Your Objects

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list = [“Ruby”, “JS”, “Python”] 4th Cup: Getting Inside Your Objects

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list = [“Ruby”, “JS”, “Python”] first_two = list[0..1] 4th Cup: Getting Inside Your Objects Tasty Slices

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list = [“Ruby”, “JS”, “Python”] first_two = list[0..1] first_two #=> [“Ruby”, “JS”] 4th Cup: Getting Inside Your Objects Tasty Slices

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

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

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list = [“Ruby”, “JS”, “Python”] 4th Cup: Getting Inside Your Objects

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list = [“Ruby”, “JS”, “Python”] Head Tail 4th Cup: Getting Inside Your Objects

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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{ name, company } = me Pattern Matching 4th Cup: Getting Inside Your Objects

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

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{ name, company } = me name #=> “Nicolás” company #=> 26 Pattern Matching 4th Cup: Getting Inside Your Objects

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5th Cup Collecting Collections

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list = [1..10] for item in list doSomethingWith(item) 5th Cup: Collecting Collections Iterating over arrays

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list = [1..10] for item in list doSomethingWith(item) Iterating over arrays 5th Cup: Collecting Collections

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

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

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doubles = (n * 2 for n in [1..5]) 5th Cup: Collecting Collections Comprehensions

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

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

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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

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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

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6th Cup Context, the classy way

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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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

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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

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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

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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

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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

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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

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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

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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

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

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

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

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

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

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

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

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6th Cup: Context, the classy way super class SignedInUser extends User constructor: (args...) -> super args... $(“a.sign-out”, @element).click => this.signOut()

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

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

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

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

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

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We’ve Covered ➡ Object Literals ➡ String Interpolation ➡ Functions ➡ Default Arguments ➡ Splats ➡ Ranges ➡ Pattern Matching ➡ Context and this ➡ Property Accessors ➡ Bound Functions ➡ Classes ➡ Inheritance ➡ super

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So…

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…is it worth it?

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Questions?

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Thanks!

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Thanks! http://github.com/foca @godfoca

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Thanks! http://github.com/foca @godfoca [email protected]

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Follow-up: Existential Operator

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

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

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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

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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 “)

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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

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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

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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

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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

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

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

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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

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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

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expr? Follow-up: Existential Operator

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expr? typeof expr !== undefined && expr !== null Follow-up: Existential Operator

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x ?= y Follow-up: Existential Operator

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x ?= y x = y unless x? Follow-up: Existential Operator

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obj = x: { y: 2 } Follow-up: Existential Operator

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obj = x: { y: 2 } obj.x?.y Follow-up: Existential Operator

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

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

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

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

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func?() Follow-up: Existential Operator

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func?() func() if typeof func == “function” Follow-up: Existential Operator

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options.callback?() Follow-up: Existential Operator

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Follow-up: this

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function isCute() { return this.cute; } Follow-up: this

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var cuteKitty = { cute: true, isCute: isCute }; Follow-up: this

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var meanKitty = { cute: false, isCute: isCute }; Follow-up: this

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meanKitty.isCute() cuteKitty.isCute() Follow-up: this

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cuteKitty.isCute() true meanKitty.isCute() Follow-up: this

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cuteKitty.isCute() true meanKitty.isCute() false Follow-up: this

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function whatHappensNow() { console.log(this); } whatHappensNow() Follow-up: this

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function whatHappensNow() { console.log(this); } whatHappensNow() > [window] Follow-up: this

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$(“a.sign-out”).click(function() { console.log(this); }); Follow-up: this

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$(“a.sign-out”).click(function() { console.log(this); }); Follow-up: this

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$(“a.sign-out”).click(function() { console.log(this); }); Delete Follow-up: this

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function returnThis() { return this; } Follow-up: this

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function returnThis() { return this; } returnThis.apply(42); //=> 42 Follow-up: this

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function returnThis() { return this; } returnThis.apply(42); //=> 42 returnThis.apply(“hi”); //=> “hi” Follow-up: this

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Follow-up: Loop closures and do

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for i in [1..5] console.log i Follow-up: Loop closures and do

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

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

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

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

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

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Follow-up: Comprehension Madness

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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

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(ret.push(val) unless val in ret) for val in orig when shouldAdd(val) Keep It Simple, Stupid Follow-up: Comprehension Madness

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