Coffee scripts with rails

Coffee scripts with rails

• 1.
  Devilal Dheer Kiprosh
• 2.
   What isCoffeeScript?  Why CoffeeScript?  Types in CoffeeScript  Syntax  CoffeeScript with Rails  Advantage & Disadvantage
• 3.
   CoffeeScript isjust a Javascript.  CoffeeScript is a language that compile into javascript.  Code compiles one-to-one into the equivalent JS.  There is no interpretation at run time  Syntax take advantage of modern OO languages like Ruby and Python
• 4.
   Easy tomaintain  Easily Readable and Understandable  Less lines of code to solve problem  There is no semicolons and braces.  ‘var’ is a reserved word. So no need to declaration .
• 5.
  In CoffeeScripts everyvalue has a type. Basically There are 6 types of values:  Number  Strings  Boolean (true-false, yes-no, on-off)  Objects  Functions  Undefined values
• 6.
   == vs===  Global variable leakage (missing var)
• 7.
   It hasbeen included in Rails 3.1  Use *.coffee extension  To change a Javascript files name to a coffeescript, just append .coffee to the file name  When a CoffeeScript files is requested, It is processed by processor provided by CoffeeScript.  Rails 3.1, generate controller gives us a CoffeeScript file automatically Example:  rails new MyCoffee  cd MyCoffee  rails generate controller User signup
• 8.
  jQuery(function() { $("#title").show(); }); jQuery function() $("#title").show() jQuery-> $("#title").show() function becomes -> this. becomes @
• 9.
  var square; square =function(x) { return x * x; }; square = (x) -> x * x
• 10.
  var kids ={ brother: { name: “max", age: 11 } }; kids = brother: name: “max” age: 11
• 11.
   Postfix if/unless Implicit returns  String interpolations  Its javascripts, not ruby so:  Parentheses are not optional on functions with no arguments
• 12.
   Less code Compile time code check  Compiles into pure javascripts
• 13.
   Debugging istoo hard  Always has return value(*)