How do you use state variables with a short example?

In Perl, state variables are used to retain values between multiple calls to a subroutine. This allows you to keep track of information across different invocations of the same function without using global variables. State variables are declared using the `state` keyword, which was introduced in Perl 5.10.

Here’s a short example demonstrating the use of state variables:

sub count_calls { state $count = 0; # initial value of 0 $count++; # increment by 1 on each call print "This subroutine has been called $count times.\n"; } count_calls(); # Output: This subroutine has been called 1 times. count_calls(); # Output: This subroutine has been called 2 times. count_calls(); # Output: This subroutine has been called 3 times.

Perl state variables subroutines programming coding Perl 5.10

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