- HASKELL FUNCTIONAL PROGRAMMING LANGUAGE SYSTEM HOW TO
- HASKELL FUNCTIONAL PROGRAMMING LANGUAGE SYSTEM SOFTWARE
- HASKELL FUNCTIONAL PROGRAMMING LANGUAGE SYSTEM CODE
Program is like, and the expressiveness of functional languages, look at Programming languages take the same ideas and move them into the realm Spreadsheets and SQL are both fairly specialized languages. What's good about functional programming? (among other things) figures out the best order in which to evaluate Implementations often perform extensive query optimization which Indeed, the query can be evaluated in any convenient order. Relation should be computed, without saying how it should be computed. Projections, selections, joins and so forth. Low-level "how" is a distinguishing characteristic ofĪnother well-known nearly-functional language is the standard database This focus on the high-level "what" rather than the In which the ordering of method calls is crucial to the meaning of a With programs in conventional languages like C, which consistĮssentially of a carefully-specified sequence of assignments, or Java, Happen, you can't make much use of it! This contrasts strongly Of re-calculation is that the notion of assignment is not very useful.Īfter all, if you don't know exactly when an assignment will for the most part, we specify the value of a cell by an expression (whose parts can be evaluated in any order), rather than by a sequence of commands which computes its value.Īn interesting consequence of the spreadsheet's unspecified order.
HASKELL FUNCTIONAL PROGRAMMING LANGUAGE SYSTEM HOW TO
we do not tell the spreadsheet how to allocate its memory - rather, we expect it to present us with an apparently infinite plane of cells, and to allocate memory only to those cells which are actually in use.we do not specify the order in which the cells should be calculated - instead we take it for granted that the spreadsheet will compute cells in an order which respects their dependencies.To be computed, not how it should be computed. In a spreadsheet, one specifies the value of each cell Aįunctional program is a single expression, which is executed byĪnyone who has used a spreadsheet has experience of functional They are "imperative" in the sense that theyĬonsist of a sequence of commands, which are executed strictly oneĪfter the other. Specification then is the first prototype of the finalįunctional programs are also relatively easy to maintain, because theĬode is shorter, clearer, and the rigorous control of side effectsĮliminates a huge class of unforeseen interactions.Ĭ, Java, Pascal, Ada, and so on, are all imperative
HASKELL FUNCTIONAL PROGRAMMING LANGUAGE SYSTEM SOFTWARE
Much of a software product's life is spent in specification,ĭesign and maintenance, and not in programming.įunctional languages are superb for writing specifications which canĪctually be executed (and hence tested and debugged). It is particularly suitable for programs which need to Haskell is a wide-spectrum language, suitable for a variety ofĪpplications. A smaller "semantic gap" between the programmer and the language.Shorter, clearer, and more maintainable code.Substantially increased programmer productivity (Ericsson measured an improvement factor of between 9 and 25 using Erlang, a functional programming language similar to Haskell, in one set of experiments on telephony software).Issues), and find my Python programming style is now heavily influenced (for the better, I hope -) by my Haskell programming experience. Project (the choice being determined by both technical and non-technical I learned Haskell a couple of years ago, having previously programmed in I am WAY impressed.Įven if you are not in a position to use Haskell in your programming projects, learning Haskell can make you a better programmer in any language.
HASKELL FUNCTIONAL PROGRAMMING LANGUAGE SYSTEM CODE
Making coding mistakes! I've never in my life had a block of code Test/example code and had almost no implementation errors in the code! TheĬompiler/type-system is really really good at preventing you from Program in terms of transformations between types. WOW! I basically wrote this without testing just thinking about my Wrote a small relational DBMS in Haskell had this to say: Functional programming languages, suchĪs Haskell, can make it easier and cheaper.