effect-io-ai

Package: effect
Module: Option

Option.as

Replaces the value inside a Some with a constant, leaving None unchanged.

When to use

Use when you need to replace a present Option value while preserving whether it was Some or None.

Example (Replacing a value)

import { Option } from "effect"

console.log(Option.as(Option.some(42), "new value"))
// Output: { _id: 'Option', _tag: 'Some', value: 'new value' }

console.log(Option.as(Option.none(), "new value"))
// Output: { _id: 'Option', _tag: 'None' }

See

• asVoid to replace with undefined
• map for a general transformation

Signature

declare const as: { <B>(b: B): <X>(self: Option<X>) => Option<B>; <X, B>(self: Option<X>, b: B): Option<B>; }

Source

Since v2.0.0