effect-io-ai

Package: effect
Module: Option

Option.orElseSome

Returns Some of the fallback value if self is None; otherwise returns self.

When to use

Use when providing a default plain value (not an Option) as fallback

Details

• Some → returns self unchanged
• None → calls onNone(), wraps result in Some, and returns it

Example (Providing a fallback value)

import { Option } from "effect"

console.log(Option.none().pipe(Option.orElseSome(() => "b")))
// Output: { _id: 'Option', _tag: 'Some', value: 'b' }

console.log(Option.some("a").pipe(Option.orElseSome(() => "b")))
// Output: { _id: 'Option', _tag: 'Some', value: 'a' }

See

• orElse when the fallback is itself an Option

Signature

declare const orElseSome: { <B>(onNone: LazyArg<B>): <A>(self: Option<A>) => Option<B | A>; <A, B>(self: Option<A>, onNone: LazyArg<B>): Option<A | B>; }

Source

Since v2.0.0