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Filter (higher-order Function)
In functional programming, filter is a higher-order function that processes a data structure (usually a list (data structure), list) in some order to produce a new data structure containing exactly those elements of the original data structure for which a given predicate (computer programming), predicate returns the Boolean value true. Example In Haskell (programming language), Haskell, the code example filter even [1..10] evaluates to the list 2, 4, …, 10 by applying the predicate even to every element of the list of integers 1, 2, …, 10 in that order and creating a new list of those elements for which the predicate returns the Boolean value true, thereby giving a list containing only the even members of that list. Conversely, the code example filter (not . even) [1..10] evaluates to the list 1, 3, …, 9 by collecting those elements of the list of integers 1, 2, …, 10 for which the predicate even returns the Boolean value false (with . being the function composition ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Functional Programming
In computer science, functional programming is a programming paradigm where programs are constructed by Function application, applying and Function composition (computer science), composing Function (computer science), functions. It is a declarative programming paradigm in which function definitions are Tree (data structure), trees of Expression (computer science), expressions that map Value (computer science), values to other values, rather than a sequence of Imperative programming, imperative Statement (computer science), statements which update the State (computer science), running state of the program. In functional programming, functions are treated as first-class citizens, meaning that they can be bound to names (including local Identifier (computer languages), identifiers), passed as Parameter (computer programming), arguments, and Return value, returned from other functions, just as any other data type can. This allows programs to be written in a Declarative programming, d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Algorithm (C++)
In the C++ Standard Library, the algorithms library provides various functions that perform algorithmic operations on containers and other sequences, represented by Iterators.ISO/ IEC (2003). '' ISO/IEC 14882:2003(E): Programming Languages - C++ §25 Algorithms library ib.algorithms' para. 1 The C++ standard provides some standard algorithms collected in the standard header. A handful of algorithms are also in the header. All algorithms are in the namespace. Execution policies C++17 provides the ability for many algorithms to optionally take an execution policy, which may allow implementations to execute the algorithm in parallel (i.e. by using threads or SIMD instructions). There are four different policy types, each indicating different semantics about the order in which element accesses are allowed to be observed relative to each other * , which indicates that the execution of the algorithm must happen on the thread which invokes the function, and the order of elemen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
