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List comprehensions no longer provide a convenient way to express wheel-rolling.
The same rules for polymorphism and monomorphism as for list comprehensions apply to do expressions.
List comprehensions are compiled to map and filter, where map operates in parallel over these arrays.
The next two propositions relate shapelessness to monad comprehensions.
Equations (l)- can be used as left to right rewrite rules to translate list comprehensions.
Efficient compilation of list comprehensions and optimization of database queries have a lot in common.
In this lab you are not allowed to use any of them (or any list comprehensions), but must write your own versions.
Actually, genarray-with-loops are powerful array comprehensions, and fold-with-loops are versatile folding templates, both specifically designed for multi-dimensional arrays.
A prototype implementation has been developed providing, amongst other things, the first concrete implementation of monad comprehensions known to us at the time of writing.
Indeed, all of the languages discussed here use some parallel extension of list comprehensions and implicitly parallel higher-order functions such as map.
List comprehensions consist of a generator and a filter.
If this behavior is achieved, then neither expressibility nor efficiency requires a separate syntax for array comprehensions.
List comprehensions provide an elegant, expressive means to concisely formulate certain patterns of calculation on lists.
The parallel construct is the list and list comprehensions are compiled into potentially parallel loops.
In section 3.4, we replace in it3a the abstract by the concrete expressions, simplify, replace iterators by list comprehensions, and introduce names for the intermediate values computed by the phases.
