Dave Mitchell questions

Dave Mitchell answers

• How to check if LVALUE represents SCALAR
• I think this code finds string length. What's actually going on here?
• How to solve Perl's `length 'für' == 4` for `LC_CTYPE="en_US.UTF-8"`?
• How does foreach(@array, $var) work in Perl?
• Check Array and Hash is Empty or Not
• Why doesn't Perl warn about using `$a` outside of sort block anymore?
• Why is a bareword following the concatenation operator a string in Perl?
• Why is substr-lvalue faster than four-arg substr?
• Eliminate whitespace around single letters
• What is the difference about subroutine has the * prototype between Perl 5.22 and before?