Selecting a branch and binding components according to a value's constructor structure. In Haskell, matching a constructor can demand the outer constructor without demanding every field; a failed or undefined match has distinct consequences from an irrefutable pattern.
A pattern that does not force its matched value merely to establish the match. A Haskell pattern written with
~ can defer evaluation of a recursive pair until one component is demanded. This can preserve productivity in definitions involving lazy evaluation. It does not make every later use of the components terminate. Articles by others on the same topic
Pattern matching is a technique used in various fields such as computer science, mathematics, and data analysis to identify occurrences of structures (patterns) within larger sets of data or information. It encompasses a wide range of applications, from programming to artificial intelligence. Here are some key aspects: 1. **Computer Science**: In programming languages, pattern matching often refers to checking a value against a pattern and can be used in functions, data structures, and control flow.