But this violates referential transparency because calling it multiple times with the same argument will return different results each time as the current position in the file gets moved.
12.
They can have referential transparency, i . e . the same language expression can result in different values at different times depending on the state of the executing program.
13.
The primary disadvantage of languages that enforce referential transparency is that they make the expression of operations that naturally fit a sequence-of-steps imperative programming style more awkward and less concise.
14.
As a computer language, it is notable in combining a declarative ( non-procedural ) structure for referential transparency, array abstraction, and automatic dependency maintenance for efficient sequencing of computation.
15.
Note that this definition is in terms of values, and is appropriate in functional languages ( it assumes referential transparency ); different trees have no connections, as they are simply lists of values.
16.
This follows from a fundamental property of pure functional languages, termed referential transparency : the value of a computed result does not depend on the order or time of evaluation, due to the absence of side effects.
17.
Therefore, referential transparency allows us to reason about our code which will lead to more robust programs, the possibility of finding bugs that we couldn't hope to find by testing, and the possibility of seeing opportunities for optimization.
18.
And the �Benefits and applications?part of this page consider mostly the benefits of persistency and of referential transparency, therefore, I don't think we lose anything if this part is deleted . undated comment added 19 : 11, 31 July 2016 ( UTC)
19.
And since readLine2 does not return f itself but rather a new, different file object differentF, this means that it's impossible for readLine2 to be called with f as an argument ever again, thus preserving referential transparency while allowing for side effects to occur.
20.
In the mid-eighties, a number of papers introduced the notion of hygienic macro expansion ( syntax-rules ), a pattern-based system where the syntactic environments of the macro definition and the macro use are distinct, allowing macro definers and users not to worry about inadvertent variable capture ( cf . referential transparency ).
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