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The following syntactic bindings are exported by the library
(vicare containers chains). The bindings whose name is prefixed
with $ are unsafe operations: they do not validate their
arguments before accessing them.
Map the procedure fun over the chain arguments; build and return a new chain holding the results of the application. The iteration starts from the link given as argument, then it proceeds in the forwards direction; the iteration stops when reaching the end of one of the chain arguments.
Apply the procedure fun over the chain arguments; discard the results. The last procedure application is performed in tail position, so its return value is the return value of the iteration; if one of the arguments is null: the return value is ‘#!void’. The iteration starts from the link given as argument, then it proceeds in the forwards direction; the iteration stops when reaching the end of one of the chain arguments.