effect-io-ai

Package: effect
Module: Option

Option.lift2

Lifts a binary function to operate on two Option values.

When to use

Use when you need to reuse an existing binary function with two Option values.

Details

• Both Some → applies f and wraps in Some
• Either None → None

Example (Lifting addition)

import { Option } from "effect"

const addOptions = Option.lift2((a: number, b: number) => a + b)

console.log(addOptions(Option.some(2), Option.some(3)))
// Output: { _id: 'Option', _tag: 'Some', value: 5 }

console.log(addOptions(Option.some(2), Option.none()))
// Output: { _id: 'Option', _tag: 'None' }

See

• zipWith for a non-lifted variant

Signature

declare const lift2: <A, B, C>(f: (a: A, b: B) => C) => { (that: Option<B>): (self: Option<A>) => Option<C>; (self: Option<A>, that: Option<B>): Option<C>; }

Source

Since v2.0.0