Int.MapSourceSame as add, but expects the key to be present, and thus faster.
Apply the given function to the binding of the given key.
bind f s transform the set x1; ...; xn into x1 := f x1; ...; xn := f xn.
Alias for fold, to easily track where we depend on fold order.
find_range in_range m Given a comparison function in_range x, that tests if x is below, above, or inside a given range filter_range returns the submap of m whose keys are in range. Note that in_range has to define a continouous range.
Fold operators parameterized by any monad.