The compiler enforces the type check and produces clean, concise, and correct code with few side effects from the outset. Its foundation is a strong static type safety and inference system. ![]() Haskell programs are a series of high-level generalizable functions that define what the program is intended to do, letting lower layers (compiler, runtime, and libraries) handle mundane low-level details such as iteration. ![]() You can add a function to another function the way you can add an integer to an integer, 1 + 1, or 35 + 53. A functional program is a single expression, which is executed by evaluating the expression.Īnother interesting feature of functional languages like Haskell: functions are treated as values like integers (numbers) and strings. They are "imperative" in the sense that they consist of a sequence of commands, which are executed strictly one after the other. That goes well with referential transparency and it allows you to think of programs as a series of transformations on data.Ĭ, Java, Pascal, Ada, and so on, are all imperative languages. Haskell is lazy, which means that unless specifically told otherwise, Haskell won't execute functions and calculate things until it's really forced to show you a result. Haskell is both the culmination and solidification of many years of research on lazy functional languages. ![]() (The 'Generic Haskell User Guide' paper is a fine paper, but I think it is a particularly bad recommendation for a beginning Haskell programmer, as it is more of an academic paper presenting extensions to Haskell and basically a different language 'Generic Haskell' (i.e. Haskell provides higher-order functions, non-strict semantics, static polymorphic typing, user-defined algebraic datatypes, pattern-matching, list comprehensions, a module system, a monadic I/O system, and a rich set of primitive data types, including lists, arrays, arbitrary and fixed precision integers, and floating-point numbers. The Haskell wikibook which includes the text from the great tutorial Yet Another Haskell Tutorial. Haskell is a general-purpose, purely functional programming language incorporating many recent innovations in programming language design.
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