Difference between revisions of "Ruby/C2/Hello-Ruby/English-timed"

From Script | Spoken-Tutorial
Jump to: navigation, search
Line 175: Line 175:
 
|-
 
|-
 
|  02:38
 
|  02:38
−
| '''ruby '''''space''''' ''hyphen ''e '''''space'' within single quotes '''puts '''space''' '''then within double quotes''' Hello World''' and
+
| '''ruby''' ''space'' ''hyphen'' '''e''' ''space'' within single quotes '''puts''' ''space'' then within double quotes '''Hello World''' and
  
 
|-
 
|-
 
|  02:50
 
|  02:50
−
| Press '''Enter.'''
+
| press '''Enter.'''
  
 
|-
 
|-
 
|  02:53
 
|  02:53
−
|  We get the output as '''Hello World.'''
+
|  We get the output as '''HelloWorld.'''
  
 
|-
 
|-
 
| 02:56
 
| 02:56
−
|   '''puts '''command''' '''is used to print the output on the '''terminal.'''
+
| '''puts '''command is used to print the output on the '''terminal.'''
  
 
|-
 
|-
 
| 03:00
 
| 03:00
−
|  The'' hyphen'' '''e flag '''allows only a single line of code to be executed.
+
|  The hyphen 'e' '''flag''' allows only a single line of code to be executed.
  
 
|-
 
|-
 
|  03:06
 
|  03:06
−
| Multiple''' '''''hyphen''''' e flags''' can be used to execute multiple line commands.  
+
| Multiple hyphen 'e' flags can be used to execute multiple line commands.  
  
 
|-
 
|-
 
|  03:11
 
|  03:11
−
| Lets try this out
+
| Let's try this out.
  
 
|-
 
|-
 
|  03:13
 
|  03:13
−
|  Now press the up Arrow key to get the previous command and  
+
|  Now, press the up-arrow key to get the previous command and  
  
 
|-
 
|-
 
|  03:18
 
|  03:18
−
| Type ''space''' hyphen ''e '''''space ''within'' ''single quotes '''puts '''space '''1+2 '''and
+
| type: ''space'' ''hyphen'' '''e''' ''space '' within single quotes '''puts ''' ''space'' '''1+2 '''and
  
 
|-
 
|-
 
|  03:30
 
|  03:30
−
| Press''' Enter.'''
+
| press''' Enter.'''
  
 
|-
 
|-
Line 219: Line 219:
 
|-
 
|-
 
|  03:36   
 
|  03:36   
−
| Let's switch back to our slide
+
| Let's switch back to our slide.
  
 
|-
 
|-
Line 227: Line 227:
 
|-
 
|-
 
|  03:42
 
|  03:42
−
| '''Interactive Ruby '''allows the execution of '''Ruby''' commands with immediate response.
+
| '''Interactive Ruby '''allows the execution of Ruby commands with immediate response.
  
 
|-
 
|-
 
|  03:48
 
|  03:48
−
| You can run '''Ruby''' statements and examine the output and return values.
+
| You can run Ruby statements and examine the output and return values.
  
 
|-
 
|-
 
|  03:53
 
|  03:53
−
| For older version of '''Ruby,''' install '''irb''' separately.
+
| For older version of Ruby, install '''irb''' separately.
  
 
|-
 
|-
 
|  03:57
 
|  03:57
−
| Now let us execute our '''Ruby''' code through '''irb.''' Go to the terminal  
+
| Now, let us execute our '''Ruby code '''through '''irb.''' Go to the terminal.
  
 
|-
 
|-
 
|  04:03
 
|  04:03
−
| Type'''irb '''and Press '''Enter'''  
+
| Type "irb"  and press '''Enter'''  
  
 
|-
 
|-
 
|  04:06
 
|  04:06
−
| to launch the '''Interactive Ruby'''  
+
| to launch the '''Interactive Ruby'''.
  
 
|-
 
|-
 
| 04:09
 
| 04:09
−
| Type '''puts ''' space within double quotes '''Hello World''' and press '''Enter.'''
+
| Type: '''puts ''' ''space'' within double quotes '''Hello World''' and press '''Enter.'''
  
 
|-
 
|-
Line 263: Line 263:
 
|-
 
|-
 
| 04:25
 
| 04:25
−
|  To''' '''exit from '''irb '''type '''exit''' and press '''Enter.'''
+
|  To exit from '''irb ''', type '''exit''' and press '''Enter.'''
  
 
|-
 
|-
Line 275: Line 275:
 
|-
 
|-
 
|  04:39
 
|  04:39
−
|  I am using '''gedit '''text editor'''. Let me switch to  '''gedit''' text editor
+
|  I am using '''gedit '''text editor'''. Let me switch to  '''gedit''' text editor.
  
 
|-
 
|-
 
| 04:45
 
| 04:45
−
|  Now, type '''puts''' space within double quotes''' Hello World '''
+
|  Now, type: '''puts''' ''space'' within double quotes''' Hello World '''.
  
 
|-
 
|-
 
|  04:54
 
|  04:54
−
| Lets learn how to add multiple line or block '''comments'''.
+
| Let's learn how to add '''multiple line''' or '''block comments'''.
  
 
|-
 
|-
 
|  04:59
 
|  04:59
−
|  Before the '''puts '''command
+
|  Before the '''puts '''command,
  
 
|-
 
|-
 
|  05:01
 
|  05:01
−
| Type, ''equal to '''''begin '''and press '''Enter'''
+
| type: ''equal to'' '''begin '''and press '''Enter'''.
  
 
|-
 
|-
 
|  05:06
 
|  05:06
−
| 'Equal to '''''begin '''is used to start the comment.
+
| ''equal to'' '''begin '''is used to start the comment.
  
 
|-
 
|-
Line 303: Line 303:
 
|-
 
|-
 
|  05:13
 
|  05:13
−
| I will type '''My first Ruby program '''
+
| I will type: "My first Ruby program"
  
 
|-
 
|-
 
|  05:20
 
|  05:20
−
| and Press '''Enter'''
+
| and press '''Enter'''.
  
 
|-
 
|-
 
|  05:22
 
|  05:22
−
| Then type '''This code will print helloworld''' and '''Press Enter'''
+
| Then type: "This code will print helloworld" and press '''Enter'''.
  
 
|-
 
|-
 
|  05:30
 
|  05:30
−
|  Now type ''equal to '''''end'''
+
|  Now, type: ''equal to'' '''end'''.
  
 
|-
 
|-
 
| 05:32
 
| 05:32
−
| ''equal to '''''end '''is used to end the multiple line''' comments.'''
+
| ''equal to'' '''end '''is used to end the '''multiple line comment'''s.
  
 
|-
 
|-
 
| 05:37
 
| 05:37
−
|  '''Comments''' are useful to understand the flow of program.
+
|  '''Comment'''s are useful to understand the flow of program.
  
 
|-
 
|-
 
|  05:41
 
|  05:41
−
| It is useful for documentation.
+
| It is useful for '''documentation'''.
  
 
|-
 
|-
Line 339: Line 339:
 
|-
 
|-
 
| 05:53
 
| 05:53
−
|  The '''Save As '''dialog box''' '''appears on your screen.  
+
|  The '''Save As '''dialog-box appears on your screen.  
  
 
|-
 
|-
Line 347: Line 347:
 
|-
 
|-
 
|  06:01
 
|  06:01
−
|  On 'Desktop, '''I will create a folder named '''rubyprogram'''.  
+
|  On '''Desktop,''' I will create a folder named "rubyprogram".  
  
 
|-
 
|-
Line 359: Line 359:
 
|-
 
|-
 
|  06:14
 
|  06:14
−
| I will type '''hello.rb'''
+
| I will type "hello.rb".
  
 
|-
 
|-
 
|  06:17
 
|  06:17
−
|  '''Dot rb''' extension is given to a '''Ruby '''file
+
|  '''dot rb''' extension is given to a '''Ruby '''file.
  
 
|-
 
|-
 
|  06:21
 
|  06:21
−
|  Then click on '''Save '''button to save the file.  So the file is saved now.  
+
|  Then click on '''Save '''button to save the file.  So, the file is saved now.  
  
 
|-
 
|-
Line 375: Line 375:
 
|-
 
|-
 
|  06:32
 
|  06:32
−
| Lets clear the terminal first.
+
| Let's clear the terminal first.
  
 
|-
 
|-
Line 383: Line 383:
 
|-
 
|-
 
|  06:39  
 
|  06:39  
−
|  Remember that we are in the '''home '''directory. We need to go to the subdirectory '''rubyprogram'''.
+
|  Remember that we are in the '''home '''directory. We need to go to the sub-directory '''rubyprogram'''.
  
 
|-
 
|-
 
|  06:47
 
|  06:47
−
| To do so, type '''cd''' space '''Desktop/rubyprogram''' and press '''Enter.'''  
+
| To do so, type: '''cd''' ''space'' '''Desktop/rubyprogram''' and press '''Enter.'''  
  
 
|-
 
|-
 
|  07:00
 
|  07:00
−
|  Let's execute the file. Type: '''ruby space hello dot rb''' and press '''Enter'''.
+
|  Let's execute the file. Type: '''ruby''' ''space'' '''hello dot rb''' and press '''Enter'''.
  
 
|-
 
|-
 
| 07:10
 
| 07:10
−
| We get the output '''HelloWorld.'''
+
| We get the output: "HelloWorld".
  
 
|-
 
|-
Line 407: Line 407:
 
|-
 
|-
 
|  07:22
 
|  07:22
−
|  Before that, we need to go back to the home directory. To do so, type "cd" and press '''Enter'''.
+
|  Before that, we need to go back to the '''home''' directory. To do so, type "cd" and press '''Enter'''.
  
 
|-
 
|-
Line 415: Line 415:
 
|-
 
|-
 
|  07:39
 
|  07:39
−
|  Type: '''puts '''space within double quotes '''Hello '''comma within double quotes '''World '''.
+
|  Type: '''puts''' ''space'' within double quotes '''Hello '''comma within double quotes '''World '''.
  
 
|-
 
|-

Revision as of 17:15, 28 October 2015

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 features 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 HelloWorld.
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 Let's 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 Type "irb" 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 Let's 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 Let's 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 sub-directory 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 commands 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 summarizes 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

Retrieved from "https://script.spoken-tutorial.org/index.php?title=Ruby/C2/Hello-Ruby/English-timed&oldid=24228"