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Folds can be regarded as consistently replacing the structural components of a data structure with functions and values. Lists, for example, are built up in many functional languages from two primitives: any list is either an empty list, commonly called nil ([]), or is constructed by prefixing an element in front of another list, creating what is called a cons node ( Cons(X1,Cons(X2,Cons ...
In computer programming, an iterator is an object that progressively provides access to each item of a collection, in order. [1] [2] [3]A collection may provide multiple iterators via its interface that provide items in different orders, such as forwards and backwards.
The Caliburn (Archived 2013-01-19 at archive.today) screen patterns framework for WPF uses C# 2.0 iterators to ease UI programming, particularly in asynchronous scenarios. The Power Threading Library ( Archived 2010-03-24 at the Wayback Machine ) by Jeffrey Richter implements an AsyncEnumerator that provides simplified Asynchronous Programming ...
The observer design pattern is a behavioural pattern listed among the 23 well-known "Gang of Four" design patterns that address recurring design challenges in order to design flexible and reusable object-oriented software, yielding objects that are easier to implement, change, test and reuse.
In 2018, Kotlin was the fastest growing language on GitHub, with 2.6 times more developers compared to 2017. [53] It is the fourth most loved programming language according to the 2020 Stack Overflow Developer Survey. [54] Kotlin was also awarded the O'Reilly Open Source Software Conference Breakout Award for 2019. [55]
Kotlin: semicolon separated (but sometimes implicitly inserted on newlines) Lua: whitespace separated (semicolon optional) Mathematica a.k.a. Wolfram semicolon separated MATLAB: newline terminated, separated by semicolon or comma (semicolon – result of receding statement hidden, comma – result displayed) MUMPS a.k.a. M
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
In object-oriented programming, the iterator pattern is a design pattern in which an iterator is used to traverse a container and access the container's elements. The iterator pattern decouples algorithms from containers; in some cases, algorithms are necessarily container-specific and thus cannot be decoupled.