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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

    Posted: 15 years ago by Tomas Petricek

  • The Haskell const function

    The const function is simple, but you can use it to make your code more legible. In this example we convert a unary function to a function of arity 2 (that ignores the second argument). Also by using the flip function from Haskell (which is equally easy to define) you can ignore the first argument.

    119 people like this

    Posted: 15 years ago by Alex Muscar

  • Chain of responsibility

    The following sample wants to make sure the person’s age is between 18 and 65, weight is no more than 200 and tall enough (>120).

    85 people like this

    Posted: 14 years ago by Tao Liu

  • Top-Down-Operator-Precedence Parser

    F# implementation of a generic Top-Down-Operator-Precedence Parser as described in this paper http://portal.acm.org/citation.cfm?id=512931 Example starts at line ~300

    90 people like this

    Posted: 15 years ago by fholm

  • Association list lookup

    While prototyping programs I find myself using association lists. This little snippet defines a lookup functions for association lists defined as lists of tuples.

    68 people like this

    Posted: 15 years ago by Alex Muscar

  • Composable WCF Web API using Async

    A functional wrapper around the new WCF Web APIs (http://wcf.codeplex.com/). Composition is achieved through the use of the HttpRequestMessage -> Async signature. Pushing the app calls in the MessageHandler intercepts all requests and allows you to take control at the earliest point possible before operation selection occurs. Extending this slightly to call the innerChannel's SendAsync would allow you to create a middleware layer that would work both with this and other, normal Web API services.

    63 people like this

    Posted: 15 years ago by Ryan Riley

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