Trusted answers to developer questions
Trusted Answers to Developer Questions

Related Tags

perl

What are arrays in Perl?

Adnan Abbas

An array is an ordered and mutable list of scalars. In Perl, scalars are defined as a single unit of data such as an integer, a floating-point, a character, a string, and so on. They are preceded by a when defined.

%0 node_1625120006811 1 node_1 2.0 node_2 car node_3 5 node_1625119972644 a node_1625119978020 xyz
Array in Perl

Syntax

The array variable begins with an @ sign. We can declare an array in the following way:

@names = ("Jacob", "Kumar", "Dinesh");

Perl does not require us to declare a variable before using it. So, we can directly store the value in it.

Accessing elements

We can access the elements in the array by indexing which works in the following way:

@order_nums = (1, 3, 55);             
@names = ("Jacob", "Kumar", "Dinesh");

print "\$order_nums[0] = $order_nums[0]\n";
print "\$order_nums[1] = $order_nums[1]\n";
print "\$order_nums[2] = $order_nums[2]\n";
print "\$names[0] = $names[0]\n";
print "\$names[1] = $names[1]\n";
print "\$names[2] = $names[2]\n";

We use the sign to access elements of the array since the element is a scalar variable.

Sequential number arrays

Perl provides a shortcut to define sequential arrays consisting of numbers and letters. Rather than typing to 100, we can use the ... notation as follows:

@range_100 = (1..100);
@range_abc = (a...g);
print "@range_100\n";
print "@range_abc\n";
Sequential array.

Array size

The size of an array can be computed using the scalar context on the array. We can see this here:

@range_100 = (1..100);
print "Size: ",scalar @range_100,"\n";
Size of an array

Insertion and removal of array elements

We can insert and remove elements from an array by using the following methods:

Operation Description
push It adds the element at the end of the array.
pop Removes and returns the last element of the array.
shift Removes and returns the first element of the array with shifting the remaining array.
unshift Adds a new element at the beginning of the array and returns the size of the resulting array.

Let us execute these operations in the following example:

@cars = ("Honda","Toyota","Hyundai");
print "1. \@cars  = @cars\n";

# pushing an element
push(@cars, "Tesla");
print "2. \@cars after push  = @cars\n";

# adding an element at beginning of the array
unshift(@cars, "Ford");
print "3. \@cars after unshift  = @cars\n";

# popping an element.
pop(@cars);
print "4. \@cars after popping = @cars\n";

# removing an element from the beginning of the array.
shift(@cars);
print "5. \@cars after shift = @cars\n";
Adding and removing elements in array.

RELATED TAGS

perl

CONTRIBUTOR

Adnan Abbas
Copyright ©2022 Educative, Inc. All rights reserved
RELATED COURSES

View all Courses

Keep Exploring