effect-io-ai

Package: effect
Module: Option

Option.fromNullishOr

Converts a nullable value (null or undefined) into an Option.

When to use

Use when you need JavaScript nullish values to become absence at an API boundary while all other values, including falsy ones, remain present.

Details

• null or undefined → None
• Any other value → Some (typed as NonNullable<A>)

Example (Converting nullable values to an Option)

import { Option } from "effect"

console.log(Option.fromNullishOr(undefined))
// Output: { _id: 'Option', _tag: 'None' }

console.log(Option.fromNullishOr(null))
// Output: { _id: 'Option', _tag: 'None' }

console.log(Option.fromNullishOr(1))
// Output: { _id: 'Option', _tag: 'Some', value: 1 }

See

• fromNullOr to only treat null as absent
• fromUndefinedOr to only treat undefined as absent
• liftNullishOr to lift a nullable-returning function

Signature

declare const fromNullishOr: <A>(a: A) => Option<NonNullable<A>>

Source

Since v4.0.0