What is Perl | unshift() Function?

In this article, we will learn Perl | unshift() Function,This free Perl tutorial for complete beginners will help you learn Perl from scratch.

Perl | unshift() Function - ❤️Perl Tutorials In 2024

unshift() function in Perl places the given list of elements at the beginning of an array. Thereby shifting all the values in the array by right. Multiple values can be unshift using this operation. This function returns the number of new elements in an array.

Syntax: unshift(Array, List)
Returns: Number of new elements in Array

Example 1:

Perl

#!/usr/bin/perl 
   
# Initializing the array 
@x = ('Beginner', 'for', 'Beginner'); 
   
# Print the Initial array 
print "Original array: @x \n"; 
   
# Prints the number of elements 
# returned by unshift 
print "No of elements returned by unshift: ", 
                   unshift(@x, 'Welcome', 'to'); 
   
# Array after unshift operation 
print "\nUpdated array: @x"; 

Output:

Original array: Beginner for Beginner 
No of elements returned by unshift: 5
Updated array: Welcome to Beginner for Beginner

Example 2:

Perl

#!/usr/bin/perl 
   
# Initializing the array 
@x = (10, 20, 30, 40, 50); 
   
# Print the Initial array 
print "Original array: @x \n"; 
   
# Prints the number of elements 
# returned by unshift 
print "No of elements returned by unshift: ", 
                   unshift(@x, 70, 80, 'Beginner'); 
   
# Array after unshift operation 
print "\nUpdated array: @x"; 

Output:

Original array: 10 20 30 40 50 
No of elements returned by unshift: 8
Updated array: 70 80 Beginner 10 20 30 40 50

Example – 3 : Unshifting two lists.

Perl

#!/usr/bin/perl
 
my @arr_1 = ("is","the","best");
 
my @arr_2 = ("Beginner","for","Beginner");
 
unshift @arr_1, @arr_2;
 
print("@arr_1");

Output –