Perl scripting language how to#
Perl scripting language code#
Perl scripting language professional#

Here we discuss the introduction and working of Perl functions with examples for better understanding.This course gives you the background needed to gain Cybersecurity skills as part of the Cybersecurity Security Analyst Professional Certificate program. This article also saw different examples of demonstrating how function or subroutine is defined by passing parameters, without passing parameters, passing lists, arrays, and hashes as parameters.

Perl scripting language code#

In this article, we conclude that function or subroutine in Perl is defined as a set of code that is used to perform some task again and again in the program, so to use this set of code, we write this code within the function or subroutine, and we call that function or subroutine by its name. In the above code, we are just passing these array, list, and hash to the subroutines or function defined. In the above code, we can see we have used for declaring list and array, and for declaring hash, we have used вЂњ%вЂќ. In the above program, we can see we have a defined array, list ad hash. Now we will see another example where we can pass list, array, and hashes as an argument. Then when we call this function and pass any two numbers that need to be added. So in the above code, we can see the two numbers that are passed are printed, and in the function, we are returning the sum of the two numbers using the return statement. In the above program, we can see we have defined a function that will calculate the sum of given numbers, and these numbers are passed as parameters to the function when it is called. Print 'The sum of the two numbers is as follows:' Print 'The function is defined for calculating sum of two numbers passed as argument' Print 'Demonstration of Perl function or subroutine with arguments:' Now we will see another example that uses parameters or arguments that are passed to the function or subroutine that is defined. In the above program, we can see we have defined subroutine or function using keyword вЂњsubвЂќ before subroutine name, and in the above code, the subroutine name is вЂњfunc_nameвЂќ, and inside the function, we are just printing the message and then we are calling the subroutine using its name, and in the above code, we are defining the subroutine with no parameters. Print 'The above defined function is now called ' Print 'Welcome to Educba with Perl tutorial' Print 'The function or subroutine is defined using sub.' Print 'Demonstration of Perl function or subroutine:'

Perl scripting language how to#

Now let us see a few examples of how to define function or subroutine in Perl: Example #1 The above syntax differs if we are using Perl version below 5 as the above syntax for calling subroutine works only in Perl version 5 and above, and if we are using below 5 versions, then we need to use an ampersand (&) before func_name such as вЂњ&func_name(parameter_lst)вЂќ which is usually not used as it means as bypassing the subroutine prototypes and hence it is not recommended to use. In Perl, subroutines or functions are created or declared using the вЂњsubвЂќ keyword before the subroutine name which is given to the set of logical code that is reused in the program and in Perl, the Perl compiler first compiles the program and then executes it irrespective of declaration of subroutines or functions. Hence the subroutines can be reused once written in the entire program. Using subroutine, we call the subroutine when we want to execute this logical code where we need not write the entire logical code repeatedly.

The subroutine contains a set of logical code that needs to be executed again and again in the program. The function or subroutine in Perl is defined as the same as other functions in other programming languages. In this article, we will see how to declare and use the function in Perl programming. In general, the Perl function is defined as a function containing subcodes or a logical set of code to perform some task and can be reused in the program. In Perl programming, language function is also known as subroutine or method, which means the same, unlike in other programming languages, subroutines and functions and methods are different. Therefore instead of rewriting the logical code in the program, we write this logical code inside the function with the name provided to this function and using the same function name to call it in the program whenever the code is needed to be executed. In Perl, the function is defined as a set of logical code that can be written within the Perl program, which is in need to write the same logical code again and again.