The "//" means if for a and b overlap doesn't exist then it equals zero, right?

Correct. It's the "defined-or" operator.

But where would I put this line? after the loop?

Wherever your read the values of $overlap.

Perl 6 - second systems done right

In reply to Re^3: how to set a value for a hash reference by moritz
in thread how to set a value for a hash reference by AWallBuilder

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