effect-io-ai

Package: effect
Module: Option

Option.contains

Returns a function that checks if an Option contains a specified value using the default Equivalence.

Details

This function allows you to check whether an Option contains a specific value. It uses the default Equivalence for equality comparison. If the Option is Some and its value is equivalent to the provided value, the result is true. If the Option is None or the values are not equivalent, the result is false.

Example

import { Option } from "effect"

console.log(Option.some(2).pipe(Option.contains(2)))
// Output: true

console.log(Option.some(1).pipe(Option.contains(2)))
// Output: false

console.log(Option.none().pipe(Option.contains(2)))
// Output: false

See

• containsWith for a version that allows you to specify a custom equivalence function.

Signature

declare const contains: { <A>(a: A): (self: Option<A>) => boolean; <A>(self: Option<A>, a: A): boolean; }

Source

Since v2.0.0