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Question: What are scalar, array, and hash variables in Perl?
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Answer: Please find below:
• Scalar variables hold single values like strings or numbers.
• Array variables hold ordered lists of scalar values.
• Hash variables hold key-value pairs, where each value is associated with a unique key.
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Question: Can you explain the difference between foreach and for loops in Perl?
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Answer: Please find the difference below:
• foreach is used to iterate over elements of a list or array.
• for loop is more general and can be used for iterating over a range of values or any iterable expression.
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Question: What is the significance of '$_' in Perl?
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Answer: The '$_' is a default variable in Perl that is implicitly used in many built-in functions
and control structures.
It represents the default input and pattern-matching space in Perl.
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Question: How do you sort an array in Perl?
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Answer: You can use the sort function to sort an array in Perl.
By default, sort sorts elements alphabetically for strings and numerically for numbers. For example:
perlCopy code
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Question: What is a Perl subroutine?
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Answer: A Perl subroutine is a named block of code that performs a specific task.
Subroutines allow for code reuse and modular programming. They can accept arguments (parameters) and return values.
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Question: How do you pass arguments to a Perl subroutine?
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Answer: Arguments are passed to Perl subroutines via '@_', an array that contains the parameters passed to the subroutine.
Inside the subroutine, you can access these arguments using array indexing ($_[0], $_[1], etc.).
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Question: What is the strict pragma in Perl?
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Answer: The strict pragma enforces stricter rules and better coding practices in Perl by requiring the use of
variables through declaration (e.g., my, our, or use vars), preventing the use of symbolic references, and imposing other restrictions.
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Question: How do you handle command-line arguments in Perl?
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Answer: Command-line arguments in Perl are available via the special array '@ARGV'.
You can access these arguments directly or use the 'Getopt::Long' module for more sophisticated argument parsing.
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Question: Can you explain the difference between eq and == in Perl?
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Answer: You can find the difference below.
• 'eq' is a string equality operator used for comparing strings.
• '==' is a numeric equality operator used for comparing numbers.
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