effect-io-ai

Package: effect
Module: Option

Option.flatten

Flattens a nested Option<Option<A>> into Option<A>.

When to use

Use when you need to remove one layer of nested Option.

Details

• Some(Some(value)) → Some(value)
• Some(None) → None
• None → None

Example (Flattening nested Options)

import { Option } from "effect"

console.log(Option.flatten(Option.some(Option.some("value"))))
// Output: { _id: 'Option', _tag: 'Some', value: 'value' }

console.log(Option.flatten(Option.some(Option.none())))
// Output: { _id: 'Option', _tag: 'None' }

See

• flatMap which is map + flatten

Signature

declare const flatten: <A>(self: Option<Option<A>>) => Option<A>

Source

Since v2.0.0