Difference between revisions of "PERL/C2/Array-functions/Gujarati"

Revision as of 14:45, 8 October 2014

| 01:02 | પ્રથમ એરેના છેલ્લા પોઝીશન પર એલિમેન્ટ ઉમેરવા ને કાઢવા વિષે શીખીશું.

|- |01:08 | આ કરવા માટે આપણી પાસે છે.

|- |01:10 | push function જે એરેના છેલ્લા પોઝીશન પર એલિમેન્ટ ઉમેરશે.

|- |01:15 | અને pop function ના છેલ્લા પોઝીશન પરથી એલિમેન્ટ કાઢી નાખ્યા.

|- |01:21 | Let us understand push and pop functions by using a sample program.

|- |01:26 |Open the terminal and type gedit perlArray dot pl space ampersand

|- |01:33 | And Press Enter

|- | 01:36 |This will open perlArray dot pl file in gedit.

|- |01:41 |Type the code as shown on the screen

|- |01:45 | Here, we have declared an Array of length 3.

|- | 01:50 | push function will insert an element at the last position of this Array i.e after 3;

|- |01:57 |whereas, pop function will remove an element from the last position of the Array.

|- |02:04 |In our case, 4 will be removed from the Array.

|- |02:08 |Press Ctrl + S to save the file.

|- |02:11 |push function takes 2 arguments-

|- |02:14 |1st argument to the push function, is the Array in which to add an element.

|- |02:20 | 2nd argument is the element which is to be pushed into the Array.

|- |02:25 | The syntax of pop function is as follows -

|- |02:29 | pop function takes only one argument

|- |02:32 |It is the Array from which an element needs to be removed.

|- |02:36 |Note: Both these functions work at last position of an Array.

|- |02:41 |The element removed by pop function can be collected into another variable.

|- |02:46 |The syntax for this is $variable space = space pop open bracket @myArray close bracket

|- |02:57 |Now switch to the terminal and execute the Perl script.

|- |03:01 |Type perl perlArray dot pl and press Enter.

|- | 03:07 | The output is as shown on the terminal.

|- | 03:11 | Now, let us see how to add/remove an element from the 1st position of an Array.

|- | 03:18 |This can be achieved using-

|- |03:20 | unshift function - which adds an element to an Array at the 1st position

|- |03:25 | shift function - which removes the first element from an Array.

|- | 03:31 |Let us understand this using a sample program.

|- |03:35 |I will open perlArray dot pl file which I have already created.

|- | 03:39 | Type the following piece of code as shown on the screen.

|- | 03:43 | unshift function will insert an element at the first position i.e before 1

|- | 03:52 | shift function will remove an element from the first position.

|- | 03:57 | In our case, zero will be removed.

|- | 04:00 | Press Ctrl + S to save the file.

|- |04:03 |The unshift function takes 2 arguments -

|- |04:06 |1st argument is the Array in which to add an element

|- |04:10 | 2nd argument is the element to be added into the Array

|- |04:15 | shift function takes only one argument -

|- |04:18 |This is the Array from which the element needs to be removed.

|- | 04:22 | Note: Both these functions works at first position of an Array.

|- | 04:27 | We can collect the element removed by shift function into some variable.

|- |04:33 |This syntax for this is - $variable space = space shift open bracket @myArray close bracket

|- |04:44 |Then switch to the terminal and execute the Perl script.

|- |04:48 |Type perl perlArray dot pl and press Enter.

|- |04:54 |The output displayed on the terminal is as highlighted.

|- |04:59 |Now, let us see how to remove an element from a specified position of an Array.

|- |05:05 | splice function removes an element from a specified position of an Array.

|- |05:11 |The return value of this function is an Array of removed elements.

|- |05:17 |Let us understand this using a sample program.

|- | 05:21 |Go to the perlArray dot pl file, which we created earlier.

|- | 05:26 | Type the piece of code as shown on the screen.

|- |05:30 | We need to provide index from where we want to remove the elements and

|- | 05:35 | the offset upto which we want to remove the elements

|- | 05:39 | In our case, the elements 5 and 6 will be removed.

|- | 05:44 | Then switch to the terminal and execute the Perl script by typing -

|- | 05:49 | perl perlArray dot pl and press Enter.

|- |05:55 |The output is as shown on the terminal

|- | 05:59 | Now let us look at few other inbuilt functions of Arrays.

|- | 06:04 | split function is used to divide a string at a specified delimiter.

|- |06:10 |The return value of this function is an Array.

|- | 06:14 |The elements of this Array are the divided portions of the string.

|- |06:19 | join function joins the elements of an Array , using the specified delimiter.

|- |06:25 |It returns a string of joined elements.

|- | 06:28 | sort function sorts an Array in alphabetical/numerical order.

|- | 06:34 | qw function returns an Array of words, separated by a white space.

|- | 06:40 | Now let us understand all these functions using a sample program.

|- | 06:45 |Switch to terminal and type

|- |06:48 | gedit arrayFunctions dot pl space ampersand and Press Enter

|- |06:55 |Type the following piece of code as shown on screen.

|- |07:00 |In this case, each word of the variable string will become an element of an Array

|- |07:07 | Here, each element of newArray will be joined by comma.

|- |07:12 | sort function will sort the elements of an Array in alphabetical order.

|- |07:19 | qw function creates an Array of words separated by space.

|- |07:25 | Let us understand each function.

|- |07:28 |split function takes two arguments.

|- |07:31 | 1st argument is the delimiter by which the string needs to be split

|- |07:36 | 2nd is the string which needs to be split.

|- |07:39 |Delimiters can be specified in forward slash, single or double quotes.

|- |07:45 | join function takes 2 arguments.

|- |07:48 |1st is the delimiter by which the Array elements needs to be joined.

|- |07:53 |2nd is the Array.

|- |07:55 |Delimiters can be specified in single or double quotes.

|- |07:58 | sort function takes a single argument , which is the Array that needs to be sorted.

|- |08:05 | qw function returns an Array of words, separated by space.

|- |08:11 |It is not necessary to specify the word in quotes , if written using qw.

|- |08:17 |Then switch to the terminal and execute the Perl script by typing -

|- |08:23 | perl arrayFunctions dot pl

|- |08:26 |and press Enter.

|- |08:29 |The following output is displayed on the screen.

|- |08:33 |Let us summarize.

|- |08:34 |In this tutorial, we have learnt to -

|- |08:36 |add/remove elements from an Array

|- |08:40 |basic functions which can be performed on Array using sample programs

|- |08:46 |Here is assignment for you -

|- |08:48 |'script.spoken-tutorial.org/index.php/Perl'

|- |08:54 |split the above string at '/ ' (forward slash) delimiter

|- |08:59 |Add https:// at the start of an newly created Array

|- |09:06 |Remove element “Perl” from the Array

|- |09:09 |Declare number Array and sort it

|- |09:12 |Watch the video available at the following link

|- |09:15 |It summaries the Spoken Tutorial project

|- |09:19 |If you do not have good bandwidth, you can download and watch it

|- | 09:24 | The Spoken Tutorial Project Team Conducts workshops using spoken tutorials

|- |09:30 |Gives certificates to those who pass an online test

|- |09:34 |For more details, please write to contact at spoken hyphen tutorial dot org

|- | 09:40 | Spoken Tutorial Project is a part of the Talk to a Teacher project

|- |09:44 |It is supported by the National Mission on Education through ICT, MHRD, Government of India.

|- |09:51 |More information on this Mission is available at spoken hyphen tutorial dot org slash NMEICT hyphen Intro

|- | 10:02 | Hope you enjoyed this Perl tutorial.

|- |10:04 |This is Amol signing off.

|- |10:06 |Thanks for joining.

|}