I have a question about using "//" operator, my testing code is as following:

perl -e '@arr1=();@arr2=(1,2,3);@arr3=defined(@arr1)?@arr1:@arr2;print "[@arr3]\n"' 

[1 2 3] 

perl -e '@arr1=();@arr2=(1,2,3);@arr3=@arr1//@arr2;print "[@arr3]\n"' 

[0] 

perl -e '$v1=();$v2="123";$v3=defined($v1)?$v1:$v2;print "[$v3]\n"' 

[123] 

perl -e '$v1=();$v2="123";$v3=$v1//$v2;print "[$v3]\n"' 

[123]

my question is, why do using "//" operator give the same results as using "defined()? : " on the scalar, but not array(or hash)?

Thanks!!!

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