Snippets tagged pattern matching
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Filtering lists
Two functions showing how to filter functional lists using the specified predicate. First version uses naive recursion and the second one is tail-recursive using the accumulator parameter.
76 people like this
Like the snippet!Posted: 14 years ago by Tomas Petricek
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Active pattern for let binding inside patterns
The Let active pattern demonstrated by this snippet can be used to assign values to symbols in pattern matching. This is useful for writing complex pattern matching using match as we can handle multiple cases using a single clause.
64 people like this
Like the snippet!Posted: 14 years ago by Tomas Petricek
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DSL for detecting patterns in 2D
A simple domain specific langauge (DSL) that can be used to specify and recognize patterrns in 2D arrays. A pattern is defined by composing primitive checks, rotating and translating patterns. See also: http://t.co/6Poty4FL
3 people like this
Like the snippet!Posted: 12 years ago by Tomas Petricek
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FizzBuzz with Rule Engine
Inspired by http://dave.fayr.am/posts/2012-10-4-finding-fizzbuzz.html Rules are in a list of lambdas that can be easily modified. A pattern-matching recursive function applies them in the correct order.
7 people like this
Like the snippet!Posted: 12 years ago by Richard Broida
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Different styles of pattern matching
For tutorial, the same functionality, different styles of pattern matching.
4 people like this
Like the snippet!Posted: 10 years ago by Tuomas Hietanen
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REST For Free
HttpListener + FParsec + Pattern Matching = Simple REST Endpoints
3 people like this
Like the snippet!Posted: 9 years ago by Ted Cackowski Jr
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Coord
Playing with coordinates and moves See https://github.com/giuliohome/AdventOfCode2019/blob/master/Day15-Part1-QueueVersion.fs#L54-L66
1 people like this
Like the snippet!Posted: 5 years ago by giuliohome
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Functional wrappers for TryParse APIs
Exemplary convenience wrappers for some of the System.
0 people like this.TryParse APIs, using the combined power of F#' return value deconstruction mechanism via pattern matching, active patterns and option types instead of "out/ref" parameters. Added support for newest versions of F# to determine which overload of TryParse should be used.
Like the snippet!Posted: 29 days ago by Cody
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Projecting lists
Three functions showing how to implement projection for functional lists. First version uses naive recursion and the second one is tail-recursive using the accumulator parameter. The third version extends this with continuation passing.
73 people like this
Like the snippet!Posted: 14 years ago by Tomas Petricek
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Red-Black-Trees with insert
Found an very good article on RS-Trees in Haskell (see: http://www.eecs.usma.edu/webs/people/okasaki/jfp99.ps) It heavyly uses pattern recognition to translate those pesky balance-rules into short code. Bellowe is the simple rewrite of the haskell-implementation in F# - enjoy
6 people like this
Like the snippet!Posted: 13 years ago by Carsten König
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NUnit assertions with pattern matching
A simple utility that allows making assertions using potentially complex pattern matches.
3 people like this
Like the snippet!Posted: 12 years ago by Eirik Tsarpalis
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function keyword for pattern matching
Strangely enough, really useful documentation of F#'s "function" keyword used for pattern matching is difficult to find within Microsoft's official documentation. A Google search turns up some helpful illustrations and discussions of the keyword. Here's a simple example that some might find useful.
3 people like this
Like the snippet!Posted: 11 years ago by musicologyman
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Grouping Data Into Buckets Using Fsharp
Sample code snippet to group the data into buckets
3 people like this
Like the snippet!Posted: 9 years ago by Tamizhvendan
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Default parameter value. Useful for ASP.NET controllers
Usage: [
1 people like this] member __.Image (image, DefaultValue 1024 width, DefaultValue 768 height)
Like the snippet!Posted: 6 years ago by Yuri Martynov
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Statically typed regex pattern matching
Active pattern returning list of captured groups with parsing.
0 people like this
Like the snippet!Posted: 3 years ago by Evgeniy Andreev