Re^2: You can't assign $_ to a hash in a foreach statement


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Re^2: You can't assign $_ to a hash in a foreach statement

by markdibley (Sexton)

on Apr 08, 2022 at 17:03 UTC ( [id://11142847]=note: print w/replies, xml )

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in reply to Re: You can't assign $_ to a hash in a foreach statement
in thread You can't assign $_ to a hash in a foreach statement

You are right about the scope and actually for my purposes it is not necessary. I shouldn't have included the die at the end as it's output and the modified hash structure is not required. Sorry.

perldoc says "The foreach loop iterates over a normal list value and sets the scalar variable VAR to be each element of the list in turn." So I was expecting to be able to use a hash reference as VAR. It doesn't mention aliasing. But as you say, the answer does appear to be No.

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Re^3: You can't assign $_ to a hash in a foreach statement
by ikegami (Patriarch) on Apr 08, 2022 at 17:09 UTC

perldoc says "The foreach loop iterates over a normal list value and sets the scalar variable VAR

$var->{$y} isn't a variable.

the modified hash structure is not required

Did you just say it's not necessary to change $var->{$y}? Then why do you do it?

t doesn't mention aliasing.

Maybe, but it does mention the variable acts as an alias.

If any element of LIST is an lvalue, you can modify it by modifying VAR inside the loop. Conversely, if any element of LIST is NOT an lvalue, any attempt to modify that element will fail.

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