effect-io-ai

Package: effect
Module: Option

Option.contains

Checks whether an Option contains a value equal to the given one, using default structural equality.

When to use

Use when you need a quick membership test for an Option value using standard equality.

Details

• Some where Equal.equals(value, a) is true → true
• Some where not equal, or None → false

Example (Checking containment)

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 custom equality
• exists to test with a predicate

Signature

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

Source

Since v2.0.0