function::kernel_short - Linux

Overview

function::kernel_short is a powerful function in the F# language that simplifies working with mathematical functions represented as lambda expressions. It converts a lambda expression into a short-circuiting function that returns the first non-None result among the arguments or None if no result is found.

Syntax

kernel_short : ('a -> 'b option) -> 'a -> 'b option

Options/Flags

  • None (default): Indicates that no result was found.
  • Some(value): Indicates a valid result.

Examples

Simple Example: Find the first even number in a list:

let isEven x = if (x % 2 = 0) then Some(x) else None

let firstEven = function::kernel_short isEven [1; 3; 5; 7; 9; 11; 13]

Complex Example: Process multiple scenarios with varying results:

let scenarios = [
    {"A", Some("Apple")},
    {"B", Some("Banana")},
    {"C", None},
    {"D", Some("Dog")}]

scenarios
|> List.map (function::kernel_short snd)

Common Issues

  • Incorrect Argument Type: Ensure the input lambda expression returns an option of the correct type.
  • Infinite Loops: Avoid lambda expressions that can lead to infinite recursion or loops.

Integration

function::kernel_short can be effectively combined with other functions and sequences for advanced scenarios:

// Find the first element in a sequence that satisfies a condition
[1; 2; 3; 4; 5]
|> Seq.exists (function::kernel_short (fun x -> if (x > 3) then Some(x) else None))

Related Commands

  • Seq.exists: Determines if any element in a sequence satisfies a predicate.
  • Option.some: Wraps a value in the Some variant of the Option type.
  • Option.none: Represents the absence of a value (equivalent to None).