Difference between revisions of "Ruby/C2/Hello-Ruby/English-timed"
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Revision as of 15:04, 10 July 2014
| Time | Narration
|
| 00:00 | Welcome to the Spoken Tutorial on Hello Ruby! |
| 00:04 | In this tutorial we will learn |
| 00:06 | What is Ruby? |
| 00:08 | Features |
| 00:09 | RubyGems & Help on Ruby |
| 00:12 | Installation |
| 00:13 | Running Ruby code |
| 00:15 | Commenting |
| 00:16 | Difference between puts and print |
| 00:19 | Here we are using Ubuntu Linux version 12.04 Ruby 1.9.3 |
| 00:27 | To follow this tutorial you must be connected to internet. |
| 00:30 | You must have knowledge of using Terminal and Text editor in Linux. |
| 00:37 | Now I will explain what is Ruby. |
| 00:40 | Ruby is an object-oriented, interpreted scripting language. |
| 00:44 | It is dynamic, open source programming language. |
| 00:48 | It has an elegant syntax that is natural to read and easy to write.
|
| 00:54 | Now let us see some features of Ruby.
|
| 00:57 | Ruby is highly portable. |
| 00:59 | Ruby program runs in any operating system. |
| 01:04 | Variables in Ruby have no datatype, such as in Smalltalk, BASIC or Python. |
| 01:11 | It supports automatic memory management. |
| 01:14 | Ruby is free format language. |
| 01:17 | You can start writing your program from any line and column. |
| 01:21 | Ruby is used for developing Internet and Intra-net applications.
|
| 01:26 | One of the most important feature of Ruby is RubyGems.
|
| 01:31 | RubyGems is a package manager for Ruby programming language.
|
| 01:36 | It provides a standard format for distributing Ruby programs and libraries.
|
| 01:42 | You can create and publish your own gems. |
| 01:46 | For more information on RubyGems visit the following link.
|
| 01:51 | To get more help on Ruby you can visit the links shown. |
| 01:55 | You can install Ruby using the Ubuntu Software Centre. |
| 01:59 | For more information on Ubuntu Software Centre, please refer to the Ubuntu Linux Tutorials on this website.
|
| 02:07 | Other methods for installing Ruby are as shown in this slide. |
| 02:12 | 'Ruby code can be executed in 3 ways |
| 02:16 | Command line |
| 02:17 | Interactive Ruby |
| 02:19 | As a 'file
|
| 02:20 | We will go through each method of execution.
|
| 02:23 | First let us see how to execute the Hello World code from command line. |
| 02:28 | Open a terminal by pressing the Ctrl, Alt and T keys simultaneously.
|
| 02:33 | A terminal window appears on your screen. |
| 02:37 | Type the command |
| 02:38 | ruby space hyphen e space within single quotes puts space then within double quotes Hello World and
|
| 02:50 | Press Enter. |
| 02:53 | We get the output as Hello World. |
| 02:56 | puts command is used to print the output on the terminal. |
| 03:00 | The hyphen e flag allows only a single line of code to be executed. |
| 03:06 | Multiple hyphen e flags can be used to execute multiple line commands.
|
| 03:11 | Lets try this out |
| 03:13 | Now press the up Arrow key to get the previous command and |
| 03:18 | Type space hyphen e space within single quotes puts space 1+2 and
|
| 03:30 | Press Enter. |
| 03:32 | We get the output as Hello World and 3.
|
| 03:36 | Let's switch back to our slide |
| 03:38 | We will now learn about Interactive Ruby.
|
| 03:42 | Interactive Ruby allows the execution of Ruby commands with immediate response.
|
| 03:48 | You can run Ruby statements and examine the output and return values.
|
| 03:53 | For older version of Ruby, install irb separately. |
| 03:57 | Now let us execute our Ruby code through irb. Go to the terminal
|
| 04:03 | Typeirb and Press Enter |
| 04:06 | to launch the Interactive Ruby |
| 04:09 | Type puts space within double quotes Hello World and press Enter. |
| 04:19 | We get the output as Hello World. |
| 04:22 | And We get the return value as nil.
|
| 04:25 | To exit from irb type exit and press Enter. |
| 04:31 | You can also run Ruby program from a file.
|
| 04:34 | You can use any text editor of your choice to write the code. |
| 04:39 | I am using gedit text editor. Let me switch to gedit text editor |
| 04:45 | Now, type puts space within double quotes Hello World |
| 04:54 | Lets learn how to add multiple line or block comments. |
| 04:59 | Before the puts command |
| 05:01 | Type, equal to begin and press Enter |
| 05:06 | 'Equal to begin is used to start the comment. |
| 05:10 | Type the comments that you wish to add.
|
| 05:13 | I will type My first Ruby program |
| 05:20 | and Press Enter |
| 05:22 | Then type This code will print helloworld and Press Enter |
| 05:30 | Now type equal to end |
| 05:32 | equal to end is used to end the multiple line comments. |
| 05:37 | Comments are useful to understand the flow of program. |
| 05:41 | It is useful for documentation. |
| 05:45 | Now, let us save the file by clicking on the Save button.
|
| 05:50 | It is a good practice to save the file frequently. |
| 05:53 | The Save As dialog box appears on your screen. |
| 05:57 | Browse the location where you want to save the file. |
| 06:01 | On 'Desktop, I will create a folder named rubyprogram.
|
| 06:06 | We will save the file inside this folder. |
| 06:10 | In the Name text-box, type the name that you wish to add. |
| 06:14 | I will type hello.rb |
| 06:17 | Dot rb extension is given to a Ruby file |
| 06:21 | Then click on Save button to save the file. So the file is saved now. |
| 06:28 | To execute the code, go to the terminal. |
| 06:32 | Lets clear the terminal first. |
| 06:35 | Make sure that you are in the directory where your Ruby file is present. |
| 06:39 | Remember that we are in the home directory. We need to go to the subdirectory rubyprogram. |
| 06:47 | To do so, type cd space Desktop/rubyprogram and press Enter. |
| 07:00 | Let's execute the file . Type ruby space hello dot rb and press Enter |
| 07:10 | We get the output HelloWorld. |
| 07:13 | Now let me demonstrate the difference between puts and print statement.
|
| 07:18 | We will try this out using irb |
| 07:22 | Before that we need to go back to the home directory.To do so type cd and press Enter |
| 07:31 | Now type irb and Press Enter to launch the Interactive Ruby. |
| 07:39 | Type puts space within double quotes Hello comma within double quotes World |
| 07:50 | Here comma is used to join the two puts command together. |
| 07:55 | Now press Enter. |
| 07:57 | We get the output Hello World, but on separate lines. |
| 08:03 | Now let's try the same thing with print.
|
| 08:06 | Press up arrow key to get the previous command |
| 08:09 | Replace puts with print and Press Enter. |
| 08:14 | We get the output as Hello World but on the same line. |
| 08:19 | The keyword puts adds a newline to the end of the output. The keyword print does not. |
| 08:27 | The keyword print outputs only what we have provided. |
| 08:31 | This brings us to the end of this Spoken Tutorial. Let us switch back to our slides. |
| 08:37 | In this tutorial we have learnt |
| 08:39 | About Ruby |
| 08:41 | Installation |
| 08:42 | Execution of Ruby code |
| 08:44 | Adding multiple comments using =begin and =end
|
| 08:50 | Difference between puts and print
|
| 08:53 | As an assignment |
| 08:55 | Write a program to print your name and age |
| 08:58 | We used multiple line comments in this tutorial |
| 09:01 | Try to give single line comment
|
| 09:04 | Watch the video available at the following link.
|
| 09:07 | It summarises the Spoken Tutorial project. |
| 09:10 | If you do not have good bandwidth, you can download and watch it. |
| 09:15 | The Spoken Tutorial Project Team :
|
| 09:17 | Conducts workshops using spoken tutorials |
| 09:20 | Gives certificates to those who pass an online test |
| 09:24 | For more details, please write to contact@spoken-tutorial.org |
| 09:30 | Spoken Tutorial Project is a part of Talk to a Teacher project. |
| 09:34 | It is supported by the National Mission on Education through ICT, MHRD, Government of India. |
| 09:41 | More information on this Mission is available at below link |
| 09:45 | This is Afrin Pinjari from IIT Bombay, signing off. |
| 09:50 | Thank you for watching. |
Contributors and Content Editors
Devraj, PoojaMoolya, Pratik kamble, Ranjana, Sandhya.np14, Sneha
