Thanks CountZero for the suggestion. This was just a learning exercise where I was looking for copying a subset of a hash. Typically, I would use a hash slice but here I was looking to copy the key value pairs.
The map solution posted by choroba seems to be exactly what I needed (without creating a temporary copy of hash reference) though impairs readability (probably due to ternary op). Solution by JohnGG looks promising and quite readable but may not scale well if we have large sets of key value pairs to keep.
Still hoping to find a sweet spot between the two solutions.
