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

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{| border=1
 
{| border=1
−
|| ''Time'''
+
| '''Time'''
−
|| '''Narration'''
+
|'''Narration'''
−
 
+
  
 
|-
 
|-
−
|00.00
+
|00:00
−
|Welcome to the Spoken Tutorial on  '''Hello''' '''Ruby'''!
+
| Welcome to the '''Spoken Tutorial''' on  '''Hello Ruby!'''.
  
 
|-
 
|-
−
|  00.04
+
|  00:04
−
| In this tutorial we will learn  
+
| In this tutorial, we will learn  
  
 
|-
 
|-
−
|  00.06
+
|  00:06
 
| What is '''Ruby'''?
 
| What is '''Ruby'''?
  
 
|-
 
|-
−
|  00.08
+
|  00:08
−
| Features
+
| Features, '''RubyGems''' & Help on Ruby
−
 
+
−
|-
+
−
|  00.09
+
−
|  '''RubyGems''' &   ''' Help on Ruby'''
+
  
 
|-
 
|-
−
| 00.12  
+
| 00:12  
−
|  Installation
+
|  Installation, Running '''Ruby''' code
  
 
|-
 
|-
−
|  00.13
+
|  00:15
−
|  Running '''Ruby''' code
+
|  Commenting,  Difference between '''puts''' and '''print'''.
  
 
|-
 
|-
−
|  00.15
+
|  00:19
−
|  Commenting
+
| Here, we are using: '''Ubuntu Linux '''version '''12.04''',  '''Ruby''' 1.9.3
  
 
|-
 
|-
−
|  00.16
+
|  00:27
−
|  Difference between '''puts''' and '''print'''
+
|  To follow this tutorial, you must be connected to internet.
  
 
|-
 
|-
−
|  00.19
+
|  00:30
−
|   Here we are using '''Ubuntu Linux '''version 12.04  '''Ruby''' 1.9.3
+
| You must have the knowledge of using '''Terminal '''and '''Text editor '''in '''Linux'''.  
  
 
|-
 
|-
−
|  00.27
+
|  00:37
−
|  To follow this tutorial you must be connected to  internet.  
+
|  Now, I will explain you what is '''Ruby'''.
  
 
|-
 
|-
−
|  00.30
+
|  00:40
−
| 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.  
 
|  '''Ruby''' is an object-oriented, interpreted scripting language.  
  
 
|-
 
|-
−
|  00.44
+
|  00:44
 
|  It is dynamic, open source programming language.   
 
|  It is dynamic, open source programming language.   
  
 
|-
 
|-
−
|  00.48
+
|  00:48
 
|  It has an elegant syntax that is natural to read and easy to write.  
 
|  It has an elegant syntax that is natural to read and easy to write.  
−
 
−
 
  
 
|-
 
|-
−
| 00.54
+
| 00:54
−
|  Now let us see some features of '''Ruby'''.
+
|  Now, let us see some features of '''Ruby'''.
−
 
+
  
 
|-
 
|-
−
|  00.57
+
|  00:57
 
|  '''Ruby''' is highly portable.  
 
|  '''Ruby''' is highly portable.  
  
 
|-
 
|-
−
|  00.59
+
|  00:59
 
| '''Ruby''' program runs in any operating system.
 
| '''Ruby''' program runs in any operating system.
  
 
|-
 
|-
−
|  01.04
+
|  01:04
−
|  Variables in '''Ruby''' have no datatype, such as in '''Smalltalk, BASIC''' or '''Python'''.
+
|  Variables in '''Ruby''' have no datatype such as in '''Smalltalk, BASIC''' or '''Python'''.
  
 
|-
 
|-
−
|  01.11
+
|  01:11
 
|  It supports automatic memory management.
 
|  It supports automatic memory management.
  
 
|-
 
|-
−
|  01.14
+
|  01:14
−
|  '''Ruby''' is free format language.
+
|  '''Ruby''' is a free format language.
  
 
|-
 
|-
−
|  01.17
+
|  01:17
 
|  You can start writing your program from any line and column.
 
|  You can start writing your program from any line and column.
  
 
|-
 
|-
−
|  01.21
+
|  01:21
−
|  '''Ruby''' is used for developing Internet and Intra-net applications.
+
|  '''Ruby''' is used for developing Internet and '''Intra-net''' '''application'''s.
−
 
+
−
 
+
  
 
|-
 
|-
−
| 01.26
+
| 01:26
−
| One of the most important feature of '''Ruby''' is '''RubyGems'''.
+
| One of the most important features of '''Ruby''' is '''RubyGems'''.
−
 
+
  
 
|-
 
|-
−
| 01.31  
+
| 01:31  
−
| '''RubyGems''' is a package manager for  '''Ruby''' programming language.
+
| '''RubyGems''' is a '''package manager''' for  '''Ruby''' programming language.
−
 
+
  
 
|-
 
|-
−
|  01.36
+
|  01:36
−
| It provides a standard format for distributing''' Ruby''' programs and libraries.
+
| It provides a standard format for distributing''' Ruby''' programs and '''libraries'''.
−
 
+
  
 
|-
 
|-
−
|  01.42
+
|  01:42
 
| You can create and publish your own '''gems. '''
 
| You can create and publish your own '''gems. '''
  
 
|-
 
|-
−
|  01.46
+
|  01:46
−
| For more information on '''RubyGems''' visit the following link.
+
| For more information on '''RubyGems''', visit the following link.
−
 
+
−
 
+
−
 
+
  
 
|-
 
|-
−
|  01.51
+
|  01:51
−
|  To get more help on '''Ruby''' you can visit the links shown.
+
|  To get more help on Ruby, you can visit the links shown.
  
 
|-
 
|-
−
|  01.55
+
|  01:55
−
| You can install '''Ruby '''using the '''Ubuntu Software Centre'''.
+
| You can install Ruby using '''Ubuntu Software Centre'''.
  
 
|-
 
|-
−
|  01.59
+
|  01:59
−
| For more information on '''Ubuntu Software Centre''', please refer to the Ubuntu Linux Tutorials on this website.
+
| For more information on '''Ubuntu Software Centre''', please refer to the '''Ubuntu Linux Tutorials''' on this website.
−
 
+
  
 
|-
 
|-
−
|  02.07
+
|  02:07
−
|  Other methods for installing '''Ruby '''are as shown in this slide.
+
|  Other methods for installing Ruby are as shown in this slide.
  
 
|-
 
|-
−
|  02.12
+
|  02:12
−
| 'Ruby code '''can be executed in 3 ways
+
| '''Ruby code '''can be executed in 3 ways-
  
 
|-
 
|-
−
|  02.16
+
|  02:16
−
| '''Command line '''
+
| '''Command line ''', '''Interactive Ruby''' and
−
|-
+
−
|  02.17
+
−
|  '''Interactive Ruby'''
+
−
|-
+
−
|  02.19
+
−
|  As a '''file''
+
−
 
+
  
 
|-
 
|-
−
|  02.20
+
|  02:19
−
| We will go through each method of execution.
+
| As a '''file'''.  We will go through each method of execution.
−
 
+
  
 
|-
 
|-
−
|  02.23
+
|  02:23
−
|  First let us see how to execute the  '''Hello World''' code from  command line.
+
|  First, let us see how to execute the  '''Hello World''' code from  '''command line'''.
  
 
|-
 
|-
−
|  02.28
+
|  02:28
−
| Open a terminal by pressing the '''Ctrl, Alt and T '''keys simultaneously.  
+
| Open a '''terminal''' by pressing the '''Ctrl, Alt''' and '''T '''keys simultaneously.  
−
 
+
  
 
|-
 
|-
−
|  02.33
+
|  02:33
−
| A terminal window appears on your screen.
+
| A '''terminal window''' appears on your screen.
  
 
|-
 
|-
−
| 02.37
+
| 02:37
−
|  Type the command
+
|  Type the command: '''ruby''' ''space''  ''hyphen'' '''e''' ''space'' within single quotes '''puts''' ''space'' then within double quotes '''Hello World''' and
  
 
|-
 
|-
−
|  02.38
+
|  02:50
−
| '''ruby '''''space''''' ''hyphen ''e '''''space'' within single quotes '''puts '''space''' '''then within double quotes''' Hello World''' and
+
| press '''Enter.'''
−
 
+
  
 
|-
 
|-
−
|  02.50
+
|  02:53
−
| Press '''Enter.'''
+
| We get the output as "HelloWorld".
  
 
|-
 
|-
−
| 02.53
+
| 02:56
−
|   We get the output as '''Hello World.'''
+
| '''puts '''command is used to print the output on the '''terminal.'''
  
 
|-
 
|-
−
| 02.56
+
| 03:00
−
|   '''puts '''command''' '''is used to print the output on the '''terminal.'''
+
| The hyphen 'e' '''flag''' allows only a single line of a code to be executed.
  
 
|-
 
|-
−
| 03.00
+
| 03:06
−
| The'' hyphen'' '''e flag '''allows only a single line of code to be executed.
+
| Multiple hyphen 'e' flags can be used to execute multiple line commands.  
  
 
|-
 
|-
−
|  03.06
+
|  03:11
−
| Multiple''' '''''hyphen''''' e flags''' can be used to execute multiple line commands.  
+
| Let's try this out.
−
 
+
  
 
|-
 
|-
−
|  03.11
+
|  03:13
−
| Lets try this out
+
| Now, press the up-arrow key to get the previous command and
  
 
|-
 
|-
−
|  03.13
+
|  03:18
−
| Now press the up Arrow key to get the previous command and  
+
| type: ''space'' ''hyphen'' '''e''' ''space '' within single quotes '''puts ''' ''space'' '''1+2 '''and
  
 
|-
 
|-
−
|  03.18
+
|  03:30
−
| Type ''space''' hyphen ''e '''''space ''within'' ''single quotes '''puts '''space '''1+2 '''and
+
| press''' Enter.'''
−
 
+
  
 
|-
 
|-
−
|  03.30
+
|  03:32
−
| Press''' Enter.'''
+
| We get the output as "Hello World" and''' 3.'''
  
 
|-
 
|-
−
|  03.32
+
|  03:36 
−
| We get the output as '''Hello World '''and''' 3.'''
+
| Let's switch back to our '''slide'''.
−
 
+
  
 
|-
 
|-
−
|  03.36 
+
|  03:38
−
| Let's switch back to our slide
+
| We will now learn about '''Interactive Ruby.'''
  
 
|-
 
|-
−
|  03.38
+
|  03:42
−
|We will now learn about '''Interactive Ruby.'''
+
| '''Interactive Ruby '''allows the execution of Ruby commands with immediate response.
−
 
+
  
 
|-
 
|-
−
|  03.42
+
|  03:48
−
| '''Interactive Ruby '''allows the execution of '''Ruby''' commands with immediate response.
+
| You can run Ruby statements and examine the output and the return values.
−
 
+
  
 
|-
 
|-
−
|  03.48
+
|  03:53
−
| You can run '''Ruby''' statements and examine the output and return values.
+
| For older version of Ruby, install the '''irb''' separately.
−
 
+
  
 
|-
 
|-
−
|  03.53
+
|  03:57
−
| For older version of '''Ruby,''' install '''irb''' separately.
+
| Now, let us execute our Ruby code through 'irb'. Go to the '''terminal'''.  
  
 
|-
 
|-
−
|  03.57
+
|  04:03
−
| Now let us execute our '''Ruby''' code through '''irb.''' Go to the terminal
+
| Type "irb"  and press '''Enter'''  
−
 
+
  
 
|-
 
|-
−
|  04.03
+
|  04:06
−
| Type'''irb '''and Press '''Enter'''  
+
| to launch the '''Interactive Ruby'''.
  
 
|-
 
|-
−
| 04.06
+
| 04:09
−
| to launch the '''Interactive Ruby'''  
+
| Type: '''puts ''' ''space'' within double quotes '''Hello World''' and press '''Enter.'''
  
 
|-
 
|-
−
| 04.09
+
| 04:19
−
| Type '''puts ''' space within double quotes '''Hello World''' and press '''Enter.'''
+
|We get the output as '''Hello World'''
  
 
|-
 
|-
−
| 04.19
+
| 04:22
−
|We get the output as '''Hello World.'''
+
| and we get the return value as '''nil.'''
  
 
|-
 
|-
−
| 04.22
+
| 04:25
−
|   And We get the return value as '''nil.'''
+
| To exit from '''irb ''', type '''exit''' and press '''Enter.'''
−
 
+
  
 
|-
 
|-
−
| 04.25
+
| 04:31
−
|  To''' '''exit from '''irb '''type '''exit''' and press '''Enter.'''
+
|  You can also run the '''Ruby program''' from a file.
−
 
+
−
|-
+
−
| 04.31
+
−
|  You can also run '''Ruby program''' from a file.
+
−
 
+
  
 
|-
 
|-
−
|  04.34
+
|  04:34
 
| You can use any text editor of your choice to write the code.
 
| You can use any text editor of your choice to write the code.
  
 
|-
 
|-
−
|  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.
  
 
|-
 
|-
−
| 05.10
+
| 05:10
 
|  Type the comments that you wish to add.
 
|  Type the comments that you wish to add.
−
 
  
 
|-
 
|-
−
|  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 Hello world''' 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 comments'''.
  
 
|-
 
|-
−
| 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'''.
  
 
|-
 
|-
−
|  05.45
+
|  05:45
 
| Now, let us '''save''' the '''file''' by clicking on the '''Save '''button.  
 
| Now, let us '''save''' the '''file''' by clicking on the '''Save '''button.  
−
 
  
 
|-
 
|-
−
| 05.50  
+
| 05:50  
 
| It is a good practice to '''save''' the file frequently.
 
| It is a good practice to '''save''' the file frequently.
  
 
|-
 
|-
−
| 05.53
+
| 05:53
−
|  The '''Save As '''dialog box''' '''appears on your screen.  
+
|  The '''Save As '''dialog-box appears on your screen.  
  
 
|-
 
|-
−
|  05.57
+
|  05:57
 
| Browse the location where you want to save the file.  
 
| Browse the location where you want to save the file.  
  
 
|-
 
|-
−
|  06.01
+
|  06:01
−
|  On 'Desktop, '''I will create a folder named '''rubyprogram'''.  
+
|  On '''Desktop,''' I will create a folder named "rubyprogram".  
−
 
+
  
 
|-
 
|-
−
|  06.06
+
|  06:06
 
| We will save the file inside this folder.  
 
| We will save the file inside this folder.  
  
 
|-
 
|-
−
| 06.10
+
| 06:10
 
|  In the '''Name''' text-box, type the name that you wish to add.  
 
|  In the '''Name''' text-box, type the name that you wish to add.  
  
 
|-
 
|-
−
|  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 the '''Save '''button to save the file.  So, the file is saved now.  
  
 
|-
 
|-
−
|  06.28
+
|  06:28
 
|  To execute the code, go to the '''terminal.'''
 
|  To execute the code, go to the '''terminal.'''
  
 
|-
 
|-
−
|  06.32
+
|  06:32
−
| Lets clear the terminal first.
+
| Let's clear the terminal first.
  
 
|-
 
|-
−
|  06.35
+
|  06:35
 
|  Make sure that you are in the directory where your '''Ruby '''file is present.
 
|  Make sure that you are in the directory where your '''Ruby '''file is present.
  
 
|-
 
|-
−
|  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 as "HelloWorld".
  
 
|-
 
|-
−
|  07.13
+
|  07:13
−
|  Now let me demonstrate the difference between '''puts''' and '''print '''statement.
+
|  Now, let me demonstrate the difference between '''puts''' and '''print '''statements.
−
 
+
  
 
|-
 
|-
−
|  07.18
+
|  07:18
−
| We will try this out using''' irb'''
+
| We will try this out using "irb".
  
 
|-
 
|-
−
|  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 our '''home''' directory. To do so, type "cd" and press '''Enter'''.
  
 
|-
 
|-
−
|  07.31
+
|  07:31
−
|Now type '''irb''' and Press Enter''' to launch the '''Interactive Ruby.'''
+
|Now, type "irb" and press '''Enter''' to launch the '''Interactive Ruby.'''
  
 
|-
 
|-
−
|  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 '''.
  
 
|-
 
|-
−
|  07.50
+
|  07:50
−
| Here''' comma '''is used to join the two '''puts''' command together.
+
| Here,''' comma '''is used to join the two '''puts''' commands together.
  
 
|-
 
|-
−
|  07.55
+
|  07:55
−
| Now press '''Enter.'''
+
| Now, press '''Enter.'''
  
 
|-
 
|-
−
|  07.57
+
|  07:57
−
|  We get the output '''Hello World,''' but on separate lines.
+
|  We get the output '''Hello,  World,''' but on the separate lines.
  
 
|-
 
|-
−
| 08.03
+
| 08:03
−
|  Now let's try the same thing with '''print.'''
+
|  Now, let's try the same thing with '''print.'''
−
 
+
  
 
|-
 
|-
−
|  08.06
+
|  08:06
−
| Press up arrow key to get the previous command
+
| Press up-arrow key to get the previous command.
  
 
|-
 
|-
−
|  08.09
+
|  08:09
−
| Replace puts with print and   Press '''Enter.'''
+
| Replace '''puts''' with '''print''' and press '''Enter.'''
  
 
|-
 
|-
−
|  08.14
+
|  08:14
 
|  We get the output as '''Hello World '''but on the same line.
 
|  We get the output as '''Hello World '''but on the same line.
  
 
|-
 
|-
−
|  08.19
+
|  08:19
 
|  The keyword '''puts''' adds a newline to the end of the output. The keyword''' print '''does not.
 
|  The keyword '''puts''' adds a newline to the end of the output. The keyword''' print '''does not.
  
 
|-
 
|-
−
|  08.27
+
|  08:27
−
|   The keyword''' print '''outputs only what we have provided.
+
| The keyword''' print '''outputs only what we have provided.
  
 
|-
 
|-
−
|  08.31
+
|  08:31
−
|   This brings us to the end of this Spoken Tutorial. Let us switch back to our slides.
+
| This brings us to the end of this Spoken Tutorial. Let us switch back to our slide.
  
 
|-
 
|-
−
|  08.37
+
|  08:37
−
| In this tutorial we have learnt
+
| In this tutorial, we have learnt:
  
 
|-
 
|-
−
|  08.39
+
|  08:39
−
| About '''Ruby'''
+
| About '''Ruby''',  Installation
 +
 
 
|-
 
|-
−
|  08.41
+
|  08:42
−
| Installation
+
| Execution of '''Ruby '''code
 +
 
 
|-
 
|-
−
|  08.42
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|  08:44
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|  Execution of '''Ruby '''code
+
−
|-
+
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|  08.44
+
 
| Adding multiple comments using  =begin and  =end
 
| Adding multiple comments using  =begin and  =end
−
 
  
 
|-
 
|-
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|  08.50
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|  08:50
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| Difference between '''puts''' and '''print'''
+
| Difference between '''puts''' and '''print'''.
−
 
+
−
 
+
  
 
|-
 
|-
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|  08.53
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|  08:53
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| As an assignment
+
| As an assignment,
  
 
|-
 
|-
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| 08.55  
+
| 08:55  
−
| Write a program to print your name and age  
+
| write a program to print your name and age.
  
 
|-
 
|-
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|  08.58
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|  08:58
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| We used '''multiple line comments''' in this tutorial  
+
| We used '''multiple line comments''' in this tutorial.
  
 
|-
 
|-
−
|  09.01
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|  09:01
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| Try to give '''single line comment'''  
+
| Try to give '''single line comment'''.
  
−
 
 
|-
 
|-
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|  09.04
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|  09:04
 
| Watch the video available at the following link.
 
| Watch the video available at the following link.
−
 
  
 
|-
 
|-
−
|  09.07
+
|  09:07
−
| It summarises the Spoken Tutorial project.
+
| It summarizes the Spoken Tutorial project.
  
 
|-
 
|-
−
|  09.10
+
|  09:10
 
| If you do not have good bandwidth, you can download and watch it.  
 
| If you do not have good bandwidth, you can download and watch it.  
  
 
|-
 
|-
−
|  09.15
+
|  09:15
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|   The Spoken Tutorial Project Team :
+
| The Spoken Tutorial Project team:
−
 
+
  
 
|-
 
|-
−
|  09.17
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|  09:17
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| Conducts workshops using spoken tutorials  
+
| Conducts workshops using spoken tutorials.
  
 
|-
 
|-
−
|  09.20
+
|  09:20
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| Gives certificates to those who pass an online test  
+
| Gives certificates to those who pass an online test.
  
 
|-
 
|-
−
|  09.24
+
|  09:24
−
| For more details, please write to contact@spoken-tutorial.org
+
| For more details, please write to: contact@spoken-tutorial.org
  
 
|-
 
|-
−
|  09.30
+
|  09:30
−
|  Spoken Tutorial Project is a part of Talk to a Teacher project.
+
|  '''Spoken Tutorial''' project is a part of the '''Talk to a Teacher''' project.
  
 
|-
 
|-
−
|  09.34
+
|  09:34
 
| It is supported by the National Mission on Education through ICT, MHRD, Government of India.
 
| It is supported by the National Mission on Education through ICT, MHRD, Government of India.
  
 
|-
 
|-
−
|  09.41
+
|  09:41
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| More information on this Mission is available at below link
+
| More information on this mission is available at the below link.
  
 
|-
 
|-
−
| 09.45  
+
| 09:45  
−
| This is Afrin Pinjari from IIT Bombay, signing off.
+
| This is Afrin Pinjari from '''IIT Bombay''', signing off.
  
 
|-
 
|-
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|  09.50
+
|  09:50
 
| Thank you for watching.
 
| Thank you for watching.
  
 
|}
 
|}

Latest revision as of 11:57, 10 March 2017

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, RubyGems & Help on Ruby
00:12 Installation, Running Ruby code
00:15 Commenting, 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 the knowledge of using Terminal and Text editor in Linux.
00:37 Now, I will explain you 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 a 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 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 , Interactive Ruby and
02:19 As a file. 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: 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 a 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 the return values.
03:53 For older version of Ruby, install the 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 the 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 the 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 as "HelloWorld".
07:13 Now, let me demonstrate the difference between puts and print statements.
07:18 We will try this out using "irb".
07:22 Before that, we need to go back to our 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 the 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 slide.
08:37 In this tutorial, we have learnt:
08:39 About Ruby, 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 the 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 the 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

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