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${ isn't an operator itself - it has to be book-ended with a }. Basically you can put any legal perl inside the {}'s - so long as it evaluates to a reference. You then de-reference according to the type. It makes for some interesting strings:
print "My scalar = ${\(my $scalar = 5)}\n"; print "My array = @{[(0..9)]}\n"; print "My array via scalar references passed to map = @{[ map {$$_} \( +0..9) ]}\n"; print "My array returned by anonymous subroutine = @{[do {(0..9)}]}\n" +; print "My array formatted with join = ${\(join '*',(0..9))}\n"; print "My hash treated as array = @{ [my %h = (0..9)] }\n";
Prints:
My scalar = 5 My array = 0 1 2 3 4 5 6 7 8 9 My array via scalar references passed to map = 0 1 2 3 4 5 6 7 8 9 My array returned by anonymous subroutine = 0 1 2 3 4 5 6 7 8 9 My array formatted with join = 0*1*2*3*4*5*6*7*8*9 My hash treated as array = 0 1 2 3 4 5 6 7 8 9

In reply to Re: why this works? quoted strings by mrstlee
in thread why this works? quoted strings by patcat88

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