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Functional iterators such as map$()$ are considerably faster than the equivalent for $()$ loop.

Functional iterators such as map$()$ result in fewer lines of code as compared to a for $()$ loop.

Walk$()$ is just like map$()$ but doesn't return a value.

A for$()$ loop iterates over a sequence vector, which doesn't have to be a contiguous range of values.

Vectorized functions perform considerably faster than for $()$ loops.