Re: How to determine if an array contains an undef value?

[Laurent_R]

Hi,

your @b array is not empty, it has one element which happens to be undef. If you run something like:

print scalar @b;

it will print 1, which is why, if you evaluate the array in boolean context (... if (@b);) you get a true value and your sentence is printed.

If you want to check if the array contains at least one defined element, yes, you probably have to do ... if grep { defined($_) } @b; or something similar. You may want something else, though, if your array is large.

Update: corrected a typo.

[thanos1983]

Hello Laurent_R ,

Thank you for your time and effort reading and replying to my question. Initially I thought that undef means empty but now it makes more sense undef can be a possition reserved but currently undefined.

Again thank you for your time and effort.