if-let and when-let also come in handy in a lot of those cases.
If the nils already are in a data structure, there are (filter
identity ..)and (remove
nil? ..) to remove false and/or nil values from sequences.
On associatives, there is an :or key available in the destructuring dsl: (let
[{x :foo :or {x "default"}} m] ..)
and you can use the the default parameter of lookups like (:foo m
"default") (get m :foo "default").
Beware that in the latter two, the default is evaluated, even if the key is
found.
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