Perl | unshift() Function

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 = ('Geeks', 'for', 'Geeks');

# 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: Geeks for Geeks 
No of elements returned by unshift: 5
Updated array: Welcome to Geeks for Geeks

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, 'Geeks');

# 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 Geeks 10 20 30 40 50

Example – 3 : Unshifting two lists.

Perl

#!/usr/bin/perl

my @arr_1 = ("is","the","best");

my @arr_2 = ("Geeks","for","Geeks");


unshift @arr_1, @arr_2;


print("@arr_1");

Output –