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Purely functional
In
computing
,
algorithms
,
data structures
, or
programming languages
are called
purely functional
if they guarantee the (weak) equivalence of
call-by-name
,
call-by-value
and
call-by-need
evaluation strategies, often by excluding
destructive modifications
(updates) of entities in the program's
running environment
. According to this restriction,
variables
are used in a mathematical sense, with identifiers referring to
immutable
, persistent values.
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