Scalar context, of course.
in reply to Is it evaluated in scalar or list context?
The my ($var1, $var2, $var3, $var4); has no influence on any of the following lines. Actually context is irrelevant for that line since no assignment is done.
A program should be light and agile, its subroutines connected like a string of pearls. The spirit and intent of the program should be retained throughout. There should be neither too little or too much, neither needless loops nor useless variables, neither lack of structure nor overwhelming rigidity." - The Tao of Programming, 4.1 - Geoffrey James
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