rosetta.html

<script>
  // Rule of thumb: put a semicolon at the end of every line that doesn't end in a curly

  // Simple output
  // =============

  // puts "howdy!"

  // alert("howdy!");


  // Declaring local variables
  // =========================

  // name = "Raghu"
  // puts "howdy, #{name}!"

  // var name = "Raghu";
  // alert("howdy, " + name + "!");

  // Note: there's no String interpolation in JS


  // Defining and calling methods
  // ============================

  // def greet
  //   puts "howdy!"
  // end

  // greet

  // function greet() {
  //   alert("howdy!");
  // }

  // greet();


  // Methods that accept arguments
  // =============================

  // def greet(name)
  //   puts "howdy, #{name}!"
  // end

  // function greet(name) {
  //   alert("howdy, " + name + "!");
  // }

  // greet("Raghu");


  // Conditionals
  // ============

  // city = "Toledo"
  // if city == "Chicago"
  //   puts "You live in the best city ever!"
  // else
  //   puts "You live in a so-so city."
  // end

  // var city = "Toledo";
  // if (city === "Chicago") {
  //   alert("You live in the best city ever!");
  // }
  // else {
  //   alert("You live in a so-so city.");
  // }

  // Beware: there's also a == (non-strict equivalence) operator. Look it up.


  // Incrementing integers
  // =====================

  // i += 1

  // i++


  // For loops
  // =========

  // for i in 2...6
  //   puts i * i
  // end

  // for (var i = 2; i < 6; i++) {
  //   alert(i * i);
  // }


  // Methods that accept blocks of code
  // ==================================

  // def announce(&instructions)
  //   puts "********** DEAR PASSENGER **********"
  //   instructions.call
  //   puts "********** THANK YOU FOR FLYING ONE-WAY AIR **********"
  // end

  // announce do
  //   puts "Your flight is boarding in 5 minutes."
  // end

  // function announce(instructions) {
  //   alert("********** DEAR PASSENGER **********");
  //   instructions();
  //   alert("********** THANK YOU FOR FLYING ONE-WAY AIR **********");
  // }

  // announce(function() {
  //   alert("Your flight is boarding in 5 minutes.");
  // });


  // Methods that accept arguments and blocks
  // ========================================

  // def announce(salutation, valediction, &instructions)
  //   puts "********** #{salutation} **********"
  //   instructions.call
  //   puts "********** #{valediction} **********"
  // end

  // announce("DEAR PASSENGER", "THANK YOU FOR FLYING ONE-WAY AIR") do
  //   puts "Your flight is boarding in 5 minutes."
  // end


  // function announce(salutation, valediction, instructions) {
  //   alert("********** " + salutation + " **********");
  //   instructions();
  //   alert("********** " + valediction + " **********");
  // }

  // announce("DEAR PASSENGER", "THANK YOU FOR FLYING ONE-WAY AIR", function() {
  //   alert("Your flight is boarding in 5 minutes.");
  // });


  // Providing block variables
  // =========================

  // def announce(&instructions)
  //   puts "********** DEAR PASSENGER **********"
  //   instructions.call("*")
  //   puts "********** THANK YOU FOR FLYING ONE-WAY AIR **********"
  // end

  // announce do |special_character|
  //   puts "#{special_character} Your flight is boarding in 5 minutes. #{special_character}"
  // end

  // function announce(instructions) {
  //   alert("********** DEAR PASSENGER **********");
  //   instructions("*");
  //   alert("********** THANK YOU FOR FLYING ONE-WAY AIR **********");
  // }

  // announce(function(specialCharacter) {
  //   alert(specialCharacter + " Your flight is boarding in 5 minutes. " + specialCharacter);
  // });


  // Methods with arguments, blocks, and block variables
  // ===================================================

  // def announce(salutation, valediction, &instructions)
  //   puts "********** #{salutation} **********"
  //   instructions.call("*")
  //   puts "********** #{valediction} **********"
  // end

  // announce("DEAR PASSENGER", "THANK YOU FOR FLYING ONE-WAY AIR") do |special_character|
  //   puts "#{special_character} Your flight is boarding in 5 minutes. #{special_character}"
  // end


  // function announce(salutation, valediction, instructions) {
  //   alert("********** " + salutation + " **********");
  //   instructions("*");
  //   alert("********** " + valediction + " **********");
  // }

  // announce("DEAR PASSENGER", "THANK YOU FOR FLYING ONE-WAY AIR", function(specialCharacter) {
  //   alert(specialCharacter + " Your flight is boarding in 5 minutes. " + specialCharacter);
  // });


  // Arrays
  // ======

  // fruits = ["apples", "oranges", "bananas"]
  // puts fruits[1]
  // puts fruits.length

  // var fruits = ["apples", "oranges", "bananas"];
  // alert(fruits[1]);
  // alert(fruits.length);


  // CHALLENGE
  // =========

  // Translate the following Ruby into Javascript.

  // def for_each_in(array, &instructions)
     function for_each_in(array, instructions) {

  //   for i in 0...array.length
       for (var i = 0; i < array.length; i++) {

  //     instructions.call(array[i])
         instructions(array[i]);

  //   end
       }

  // end
     }

  // fruits = ["apples", "oranges", "bananas", "pears"]
     var fruits = ["apples", "oranges", "bananas", "pears"];

  // for_each_in(fruits) do |f|
     for_each_in(fruits, function(f) {

  //   puts "I like #{f}."
       alert("I like " + f + ".");

  // end
     });
</script>