Are you unable to crack Perl interviews?
What is Perl?
Perl Interview Questions: The acronym stands for Practical Extraction and Reporting Language. It is a powerful scripting language that is mostly used for mission critical projects.
Perl is a family of two high-level, general-purpose, interpreted, dynamic programming languages. “Perl” refers to Perl 5, but from 2000 to 2019 it also referred to its redesigned “sister language”, Perl 6, before the latter’s name was officially changed to Raku in October 2019.
While appearing for your interview, present yourself gracefully and take time to figure out and plan the answers before you speak. In case you have any doubts about a question, ask the interviewer instead of beating around the bush.
Be confident and approach the day with an optimistic outlook. You are sure to crack the interview.
??All the best!
State a few advantages of using the language
- It is efficient and easy to use
- It is an interpreted language
- It is portable and cross-platform
- It is extendable meaning that a user can include various open source packages and modules in programs for added functionality. For example, CPAN modules can be imported for database support.
What are the main disadvantage of Perl?
- It is an interpreted language which means that the execution speed is very slow.
- It has too many features that are overwhelming to programmers.
State various arguments that can be used while executing programs that are written in Perl.
- w ? an argument that shows a warning
- d ? debugging
- c ? compiles only without running
- e ? used for executing
What are the characteristics of variables and data types in Perl?
The variables do not have a data type because it is inferred from the value. It makes it more efficient to write code in Perl.
What do we mean by scalars in Perl?
These are variables with linear data types like integer, float, or string.
Name the two operators for manipulating strings in Perl and how they are used?
The concatenation operator (.) combines two strings to form one resultant string.
The repetition operator (x) repeats a string for a specified number of times.
Describe the nature of arrays in Perl?
They contain only scalar elements and cannot be defined using multi-dimensional arrays.
State the differences between DIE and EXIT in Perl?
Perl Interview Questions: Both of them are library functions that are used to exit a program. The difference is that while DIE prints a message after exiting the program, EXIT does not.
What is a subroutine in Perl?
A block of code that can be used by a program either internally or externally
Database interfaces in Perl?
Perl’s text-handling capabilities can be used for generating?SQL?queries; arrays, hashes, and automatic memory management make it easy to collect and process the returned data. For example, in Tim Bunce’s?Perl DBI?application programming interface?(API), the arguments to the API can be the text of SQL queries; thus it is possible to program in multiple languages at the same time (e.g., for generating a?Web page?using?HTML,?JavaScript, and SQL in a?here document).
Use of Perl variable interpolation
The use of Perl?variable interpolation?to programmatically customize each of the SQL queries, and the specification of Perl arrays or hashes as the structures to programmatically hold the resulting?data sets?from each SQL query, allows a high-level mechanism for handling large amounts of data for post-processing by a Perl subprogram.In early versions of Perl, database interfaces were created by relinking the interpreter with a?client-side?database library. This was sufficiently difficult that it was done for only a few of the most-important and most widely used databases, and it restricted the resulting?perl?executable to using just one database interface at a time.
