chickadee » integer-map » fxmapping-ref/default

If an association (k, v) occurs in fxmap, returns v. Otherwise, returns obj.

Examples:

(fxmapping-ref/default (fxmapping 36864 'zap) 36864 #f) ⇒ zap
(fxmapping-ref/default (fxmapping 0 'a) 36864 #f) ⇒ #f