It can be done less easily in Haskell, because even if arrays are available (albeit as second-class citizens) and hopefully well packed, the actual structure an

It can be done less easily in Haskell, because even if arrays are available (albeit as second-class citizens) and hopefully well packed, the actual structure and memory layout of their elements is an implementation detail (and, in practice, it tends to be unusually pointer-rich because it has to support lazy evaluation).