Tuesday, April 12, 2011

Understanding push, pop, unshift, shift and sort in perl scripting

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The following post explains the concepts of push, pop, unshift, shift and sort functions in perl scripting.

Array : Array is a collection of elements. its elements are numbered from 0 to n-1.

pop - Removes the last element from the array.
push - insert given element(s) to the end of the array.
unshift - Inserts the given element(s) to the beginning of the array.
shift - removes the first element of the array.
sort - sorts the array in alphabetical order.

Syntax:
pop @array_name;
push @array_name, element(s)_to_be_inserted;
unshift (@array_name, "element(s)_to_be_inserted");
shift @array_name;
my @array_name = sort @array_name;

Here is a simple example.

#!/usr/bin/perl
#Purpose - To understand the concepts of Common array functions.
#PUSH POP SHIFT UNSHIFT and SORT

#START

#Modules using
use strict;

my @array = ("1","2","3","4");
    print "The initial array elements are : @array\n";

#popping an element from the array.
my $popped_element = pop @array;
    print "The array elements after popping are : @array\n";
    print "The popped element is : $popped_element\n";


#Pushing the popped element back to the array.
push @array, $popped_element;
    print "The array elements after pushing are : @array\n";
push @array, 5, 6, 7, 8;
        print "The array elements after pushing 5, 6, 7, 8 are : @array\n";


#Unshift : Unshifting means it'll add the specified element to the begining of the array
    print "unshifting the array with element : 0\n";
unshift (@array, "0");
    print "Array elements after unshifting are : @array\n";


#shift : shift removes the first element from the array.
shift @array;
    print "The elements after the operation shift are : @array\n";


#Sorting the elements of an array.
my @array1 = ("Randeep", "Saju", "Remil", "Ajith", "Nibul" );
    print "The array1 before sorting is : @array1\n";
my @array1 = sort @array1;
    print "The array1 after sorting is : @array1\n";
#END
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1 comment:

  1. Thanks it really clarify my understanding about the concept push, pop, unshift, shift and sort

    ReplyDelete

Be nice. That's all.