mapfoldl(f, op, itr)

..  mapfoldl(f, op, itr)

Like ``mapfoldl(f, op, v0, itr)``, but using the first element of
``itr`` as ``v0``. In general, this cannot be used with empty
collections (see ``reduce(op, itr)``).


julia> mapfoldl((x) -> x+1, -, -1, [5:7])               # = ((((-1) - 6) - 7) - 8)

See Also

foldl, foldr, mapfoldl, mapfoldr, mapreduce, mapreducedim,

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