Perl Interview Questions

14 most asked Perl Interview Questions and Answers

9) Name a few arguments which are used in Perl frequently. Tell their meaning as well

  • -d which means debug
  • -w that indicates a warning
  • -e means execute
  • -c which says non return compilation
  • 7) What are “Require” and “Use” statement in Perl and when it is used?

    It is considered when it comes to importing the functions in a way that they can be accessed directly during the program. The users are free to get the results in case the substatements are not accurate. On the other side, the use statement is generally executed during parsing.

    11) Can you add a module file in Perl and what are the functions that simply enable you to do so?

    Yes, it is possible and there are “Require” “Or” and “Use”

    31) What do you understand by Perl scripting?

    It can be regarded as one important script programming language similar to that of the C and C++ language implemented in the IT market. It is mainly used for network operations. The use of Perl scripting depends on the compiler and not on the interpreter. Perl is used mainly for network operations, developing websites, and OS programs.

    37) Does Perl programming has objects or not?

    The answer to this question is yes, this programming language has objects that do not force to use it. In most cases, object-oriented modules can be used without even understanding the object. But if the program is a large one, then it is required to make it subject-oriented.

    30) What is Closure in Perl and how it is helpful?

    It is defined as the block of code in Perl which is used for capturing the lexical variable which can be accessed at a later section in a program.

    16) While start working on a project, how you will decide Perl is suitable for the same

    The first thing to pay attention to is whether the execution need is fast or not. If so, Perl is a good option to consider. The users are free to keep up the pace with flexibility as well. Perl is highly flexible and it can enable users to keep up the pace with the same. Perl is open source and is free from license issues. Perl has one of the best and in fact, the largest free code repositories that simply make it one of the best options to be considered. Also, it is one of the best programming languages with vast support available for programmers.

    perl interview questions

    This special variable is a scalar containing the first index of all arrays. Because Perl arrays have zero-based indexing, $[ will almost always be 0. But if you set $[ to 1 then all your arrays will use on-based indexing. It is recommended not to use any other indexing other than zero. However, lets take one example to show the usage of $[ variable −

    You can get the size – that is, the number of elements from a hash by using the scalar context on either keys or values. Simply saying first you have to get an array of either the keys or values and then you can get the size of array as follows −

    Here we have introduced the IF…ELSE statement, which we will study in a separate chapter. For now you just assume that if( condition ) part will be executed only when the given condition is true otherwise else part will be executed. So when we execute the above program, it produces the following result because here the given condition exists($data{Lisa} returns true −

    It checks if the value of two operands are equal or not, and returns -1, 0, or 1 depending on whether the left argument is numerically less than, equal to, or greater than the right argument. Assume variable $a holds 10 and variable $b holds 20 then ($a <=> $b) returns -1. What is the purpose of lt operator?

    The context of a subroutine or statement is defined as the type of return value that is expected. This allows you to use a single function that returns different values based on what the user is expecting to receive. For example, the following localtime() returns a string when it is called in scalar context, but it returns a list when it is called in list context.

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