foldl(op, itr)

..  foldl(op, itr)

Like ``foldl(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> fold(-, [1,2,3])
julia> foldl(/, 256, [4,2,1])

See Also

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

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