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Godfrey Chan @chancancode

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eh? Accent

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eh? Accent Healthcare

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eh? Accent Healthcare Texas

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eh? Accent Healthcare $ Taxes

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eh? Accent gem install canada

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eh? Accent >> require 'canada' => true >> [].empty_eh? => true >> [1,2,3].empty_eh? => false

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eh? Accent Healthcare $ Taxes

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Impress your peers with powerful thought leadership skills! Thought Leadership A Reference for the Rest of Us!® FREE eTips at dummies.com® All the best kept secrets of seasoned thought leaders in one book ®

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Programmer to Thought Leader™ Professional Thought Leadership Aaron Patterson , Gorby Puff, David Heinemeier Hansson g g n n o o r r w w ™

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Chapter 1 Create Controversies “TDD is dead.” David Heinemeier Hansson

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Thought Leadership Is Dead

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http://rails-weekly.goodbits.io

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Dropping Down To The Metal™ ™

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JavaScript

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Syntax

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JIT Hints

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JIT Hints

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JIT Hints

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JIT Hints

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function square(x) { return (x * x); } function diag(a, b) { return Math.sqrt( square(a) + square(b) ); } JIT Hints

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function square(x) { return (x * x); } function diag(a, b) { return Math.sqrt( square(a) + square(b) ); } JIT Hints

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function square(x) { x = +x; return +(x * x); } function diag(a, b) { a = +a; b = +b; return +Math.sqrt(square(a) + square(b)); } JIT Hints

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function square(x) { x = +x; return +(x * x); } function diag(a, b) { a = +a; b = +b; return +Math.sqrt(square(a) + square(b)); } x = +x; + a = +a; b = +b; + JIT Hints

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function square(x) { x = +x; return +(x * x); } function diag(a, b) { a = +a; b = +b; return +Math.sqrt(square(a) + square(b)); } x = +x; + a = +a; b = +b; + Much Speed 5% Faster WOW Seems le JIT JIT Hints

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660M 673M 685M 698M 710M Ops/sec Such Chart w/o JIT Hints w/ JIT Hints JIT Hints

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660M 673M 685M 698M 710M Ops/sec Such Chart w/o JIT Hints w/ JIT Hints JIT Hints

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0M 178M 355M 533M 710M Ops/sec Such Chart w/o JIT Hints w/ JIT Hints JIT Hints

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+

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JS Syntax +

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JS Syntax Speed +

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JS Syntax Speed Ruby VM +

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JS Syntax Speed Ruby VM Magic +

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JS Syntax Speed Ruby VM Magic + Awesome

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JS Syntax Speed Ruby VM Magic + Awesome Amaze

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gem install javascript

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Java

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Running Java with Ruby public class HelloWorld { public static void main(String[] args) { System.out.println("Hello, World"); } } java.rb

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Running Java with Ruby public class HelloWorld { public static void main(String[] args) { System.out.println("Hello, World"); } } java.rb % ruby java.rb ??? Terminal

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Running Java with Ruby public class HelloWorld { public static void main(String[] args) { System.out.println("Hello, World"); } } java.rb % ruby java.rb ??? Terminal A. It works™

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Running Java with Ruby public class HelloWorld { public static void main(String[] args) { System.out.println("Hello, World"); } } java.rb % ruby java.rb ??? Terminal A. It works™ B. Syntax Error

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Running Java with Ruby public class HelloWorld { public static void main(String[] args) { System.out.println("Hello, World"); } } java.rb % ruby java.rb ??? Terminal A. It works™ B. Syntax Error C. Runtime Error

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Running Java with Ruby A. It works™ B. Syntax Error C. Runtime Error public class HelloWorld { public static void main(String[] args) { System.out.println("Hello, World"); } } java.rb % ruby java.rb java.rb:2: syntax error, unexpected tIDENTIFIER, expecting ')' public static void main(String[] args) { ^ java.rb:4: syntax error, unexpected '}', expecting '(' Terminal

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How Ruby works Your Code Output Ruby Interpreter ???

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How Ruby works Your Code Output Ruby Interpreter Parse Evaluate

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How Ruby works Your Code Output Ruby Interpreter Parse Evaluate Syntax Error

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How Ruby works Your Code Output Ruby Interpreter Parse Evaluate Syntax Error Runtime Error

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JavaScript

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Running JS with Ruby console.log("Hello world!"); javascript.rb

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Running JS with Ruby console.log("Hello world!"); javascript.rb % ruby javascript.rb ??? Terminal

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Running JS with Ruby console.log("Hello world!"); javascript.rb % ruby javascript.rb ??? Terminal A. It works™

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Running JS with Ruby console.log("Hello world!"); javascript.rb % ruby javascript.rb ??? Terminal A. It works™ B. Syntax Error

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Running JS with Ruby console.log("Hello world!"); javascript.rb % ruby javascript.rb ??? Terminal A. It works™ B. Syntax Error C. Runtime Error

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console.log("Hello world!"); javascript.rb Running JS with Ruby A. It works™ B. Syntax Error C. Runtime Error % ruby javascript.rb NameError: undefined local variable or method `console' for main:Object " from javascript.rb:1 Terminal

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Running JS with Ruby console.log("Hello world!");

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Running JS with Ruby console.log("Hello world!"); Local variable (or method) named “console”

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Running JS with Ruby console.log("Hello world!"); Call instance method “log” on “console”

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Running JS with Ruby console.log("Hello world!"); Optional parenthesis

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Running JS with Ruby console.log("Hello world!"); Method argument (String literal “Hello world!”)

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Running JS with Ruby console.log("Hello world!"); Optional semicolon

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Running JS with Ruby % ruby javascript.rb NameError: undefined local variable or method `console' for main:Object " from javascript.rb:1 Terminal

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Running JS with Ruby class Console def log(*args) puts(*args) end end console = Console.new # Begin "JavaScript" console.log("Hello world!"); javascript.rb

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Running JS with Ruby class Console def log(*args) puts(*args) end end console = Console.new # Begin "JavaScript" console.log("Hello world!"); javascript.rb % ruby javascript.rb Hello world! % Terminal

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Running JS with Ruby class Console def log(*args) puts(*args) end end console = Console.new # Begin "JavaScript" console.log("Hello world!"); javascript.rb % ruby javascript.rb Hello world! % Terminal

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Running JS with Ruby class Console def log(*args) puts(*args) end end console = Console.new # Begin "JavaScript" console.log("Hello world!"); javascript.rb % ruby javascript.rb Hello world! % Terminal ಠ_ಠ

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Running JS with Ruby # Magic here... javascript.rb require 'javascript' javascript do console.log("Hello world!"); end hello_world.rb

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DSLs

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instance_exec

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instance_exec module JavaScript class Console; ... ; end class Context def console Console.new end end end module Kernel def javascript(&block) JavaScript::Context.new.instance_exec(&block) end end javascript.rb require 'javascript' javascript do console.log("Hello world!"); end hello_world.rb

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Variables

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Variables require 'javascript' javascript do var message = "Hello world!"; console.log(message); end hello_world.rb

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Variables require 'javascript' javascript do var message = "Hello world!"; console.log(message); end hello_world.rb % ruby hello_world.rb ??? Terminal

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Variables require 'javascript' javascript do var message = "Hello world!"; console.log(message); end hello_world.rb % ruby hello_world.rb ??? Terminal A. It works™

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Variables require 'javascript' javascript do var message = "Hello world!"; console.log(message); end hello_world.rb % ruby hello_world.rb ??? Terminal A. It works™ B. Syntax Error

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Variables require 'javascript' javascript do var message = "Hello world!"; console.log(message); end hello_world.rb % ruby hello_world.rb ??? Terminal A. It works™ B. Syntax Error C. NoMethodError

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Variables require 'javascript' javascript do var message = "Hello world!"; console.log(message); end hello_world.rb % ruby hello_world.rb ??? Terminal A. It works™ B. Syntax Error C. NoMethodError D. NameError

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require 'javascript' javascript do var message = "Hello world!"; console.log(message); end hello_world.rb Variables A. It works™ B. Syntax Error C. NoMethodError D. NameError % ruby hello_world.rb NoMethodError: undefined method `var' for # " from hello_world.rb:5 Terminal

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Variables var message = "Hello world!";

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Variables var(message = "Hello world!");

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Variables var(message = "Hello world!"); Optional semicolon

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Variables var(message = "Hello world!"); Optional parenthesis

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Variables var(message = "Hello world!"); String literal “Hello world!”

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Variables var(message = "Hello world!"); Variable assignment

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Variables var(message = "Hello world!"); Local variable “message”

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Variables var(message = "Hello world!"); Call method named “var”

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Variables var(message = "Hello world!"); Variable assignment “returns” the assigned value!

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Variables message = "Hello world!"; var(message);

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Variables % ruby hello_world.rb NoMethodError: undefined method `var' for # " from hello_world.rb:5 Terminal

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Variables module JavaScript ... class Context ... def var(*) end end end ... javascript.rb require 'javascript' javascript do var message = "Hello world!"; console.log(message); end hello_world.rb

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Uninitialized Variables

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Uninitialized Variables javascript do var message; message = "Hello world!"; console.log(message); end hello_world.rb

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Uninitialized Variables javascript do var message; message = "Hello world!"; console.log(message); end hello_world.rb % ruby hello_world.rb ??? Terminal

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Uninitialized Variables javascript do var message; message = "Hello world!"; console.log(message); end hello_world.rb A. It works™ % ruby hello_world.rb ??? Terminal

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Uninitialized Variables javascript do var message; message = "Hello world!"; console.log(message); end hello_world.rb A. It works™ B. Syntax Error % ruby hello_world.rb ??? Terminal

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Uninitialized Variables javascript do var message; message = "Hello world!"; console.log(message); end hello_world.rb A. It works™ B. Syntax Error C. NoMethodError % ruby hello_world.rb ??? Terminal

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Uninitialized Variables javascript do var message; message = "Hello world!"; console.log(message); end hello_world.rb A. It works™ B. Syntax Error C. NoMethodError D. NameError % ruby hello_world.rb ??? Terminal

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javascript do var message; message = "Hello world!"; console.log(message); end hello_world.rb Uninitialized Variables A. It works™ B. Syntax Error C. NoMethodError D. NameError % ruby hello_world.rb NameError: undefined local variable or method `message' for " from hello_world.rb:2 Terminal

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Uninitialized Variables var message; message = "Hello world!";

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Uninitialized Variables var message(); message = "Hello world!";

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Uninitialized Variables var(message()); message = "Hello world!";

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Uninitialized Variables % ruby hello_world.rb NameError: undefined local variable or method `message' for #

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Uninitialized Variables module JavaScript ... class Context ... def method_missing(*) end end end ... javascript.rb javascript do var message; message = "Hello world!"; console.log(message); end hello_world.rb

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Functions

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Functions javascript do function hello() { console.log("Hello world!"); } hello(); end hello_world.rb

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Functions javascript do function hello() { console.log("Hello world!"); } hello(); end hello_world.rb % ruby hello_world.rb ??? Terminal

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Functions javascript do function hello() { console.log("Hello world!"); } hello(); end hello_world.rb A. It works™ % ruby hello_world.rb ??? Terminal

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Functions javascript do function hello() { console.log("Hello world!"); } hello(); end hello_world.rb A. It works™ B. Syntax Error % ruby hello_world.rb ??? Terminal

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Functions javascript do function hello() { console.log("Hello world!"); } hello(); end hello_world.rb A. It works™ B. Syntax Error C. NoMethodError % ruby hello_world.rb ??? Terminal

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Functions javascript do function hello() { console.log("Hello world!"); } hello(); end hello_world.rb A. It works™ B. Syntax Error C. NoMethodError D. NameError % ruby hello_world.rb ??? Terminal

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Functions javascript do function hello() { console.log("Hello world!"); } hello(); end hello_world.rb A. It works™ B. Syntax Error C. NoMethodError D. NameError % ruby hello_world.rb ??? Terminal

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Functions javascript do function hello() { console.log("Hello world!"); } hello(); end hello_world.rb A. It works™ B. Syntax Error C. NoMethodError D. NameError E. Nothing Happens % ruby hello_world.rb % Terminal

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Functions function hello() { console.log("Hello world!"); }

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Functions function hello() { console.log("Hello world!"); } Invoke method “hello”

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Functions With no “regular” arguments function hello() { console.log("Hello world!"); }

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Functions ...and a block argument function hello() { console.log("Hello world!"); }

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Functions ...then invoke the method “function” with its result function hello() { console.log("Hello world!"); }

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Functions function( hello { console.log("Hello world") } )

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Functions temp = hello { console.log("Hello world") } function(temp)

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temp = hello { console.log("Hello world") } function(temp) Functions Undefined methods!

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Functions temp = hello { console.log("Hello world") } function(temp) ???!

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Functions module JavaScript class Context def method_missing(*) end end end javascript.rb

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Functions module JavaScript class Context def function(*) end def method_missing(name, *, &block) if block define_singleton_method(name, block) end end end end javascript.rb javascript do function hello() { ... } hello(); end hello_world.rb

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javascript.rb module JavaScript class Context def function(*) end def method_missing(name, *, &block) if block define_singleton_method(name, block) end end end end Functions def method_missing(name, *, &block) end hello_world.rb javascript do function hello() { ... } hello(); end hello() { ... }

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javascript.rb Functions def method_missing(name, *, &block) if block end hello_world.rb javascript do function hello() { ... } hello(); end hello() { ... } module JavaScript class Context def function(*) end def method_missing(name, *, &block) if block define_singleton_method(name, block) end end end end

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javascript.rb Functions def method_missing(name, *, &block) if block define_singleton_method(name, block) end hello_world.rb javascript do function hello() { ... } hello(); end hello() { ... } module JavaScript class Context def function(*) end def method_missing(name, *, &block) if block define_singleton_method(name, block) end end end end

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javascript.rb Functions hello_world.rb javascript do function hello() { ... } hello(); end function hello() { ... } module JavaScript class Context def function(*) end def method_missing(name, *, &block) if block define_singleton_method(name, block) end end end end

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javascript.rb Functions hello_world.rb javascript do function hello() { ... } hello(); end function hello() { ... } module JavaScript class Context def function(*) end def method_missing(name, *, &block) if block define_singleton_method(name, block) end end end end def function(*) end

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javascript.rb Functions hello_world.rb javascript do function hello() { ... } hello(); end hello(); module JavaScript class Context def function(*) end def method_missing(name, *, &block) if block define_singleton_method(name, block) end end end end

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Function Arguments

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Function Arguments javascript do function hello(name) { console.log("Hello " + name + "!"); } hello("world"); end hello_world.rb

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Function Arguments javascript do function hello(name) { console.log("Hello " + name + "!"); } hello("world"); end hello_world.rb % ruby hello_world.rb ??? Terminal

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Function Arguments javascript do function hello(name) { console.log("Hello " + name + "!"); } hello("world"); end hello_world.rb A. It works™ % ruby hello_world.rb ??? Terminal

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Function Arguments javascript do function hello(name) { console.log("Hello " + name + "!"); } hello("world"); end hello_world.rb A. It works™ B. Syntax Error % ruby hello_world.rb ??? Terminal

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Function Arguments javascript do function hello(name) { console.log("Hello " + name + "!"); } hello("world"); end hello_world.rb A. It works™ B. Syntax Error C. ArgumentError % ruby hello_world.rb ??? Terminal

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Function Arguments javascript do function hello(name) { console.log("Hello " + name + "!"); } hello("world"); end hello_world.rb A. It works™ B. Syntax Error C. ArgumentError D. NameError % ruby hello_world.rb ??? Terminal

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Function Arguments javascript do function hello(name) { console.log("Hello " + name + "!"); } hello("world"); end hello_world.rb A. It works™ B. Syntax Error C. ArgumentError D. NameError E. Nothing Happens % ruby hello_world.rb ??? Terminal

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Function Arguments javascript do function hello(name) { console.log("Hello " + name + "!"); } hello("world"); end hello_world.rb A. It works™ B. Syntax Error C. ArgumentError D. NameError E. Nothing Happens % ruby hello_world.rb ??? Terminal

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Function Arguments javascript do function hello(name) { console.log("Hello " + name + "!"); } hello("world"); end hello_world.rb A. It works™ B. Syntax Error C. ArgumentError D. NameError E. Nothing Happens % ruby hello_world.rb ??? Terminal

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vanruby/javascript

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Such tests! test "Functions can return a value" do require "javascript" javascript { function identity(x) { return x; } function square(x) { return x * x; } console.log(identity("Hello world!")); console.log(square(2)); } assert_messages "Hello world!", 4 end

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ಠ_ಠ

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Why?

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¯\_(π)_/¯

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Why not?

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@chancancode