Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In functional programming, filter is a higher-order function that processes a data structure (typically a list) in some order to produce a new data structure containing exactly those elements of the original data structure for which a given predicate returns the boolean value true. ...Full description
Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In functional programming, filter is a higher-order function that processes a data structure (typically a list) in some order to produce a new data structure containing exactly those elements of the original data structure for which a given predicate returns the boolean value true.Filter is a standard function for many programming languages, e.g. Haskell, Objective Caml, Standard ML, or Erlang. Common Lisp provides the functions remove-if and remove-if-not. SRFI 1 provides an implementation of filter for the Scheme programming language. Smalltalk provides the select: method for collections. Filter can also be realized using list comprehensions in languages that support them.