effect-io-ai

Package: effect
Module: Option

Option.makeReducerFailFast

Creates a Reducer for Option<A> by lifting an existing Reducer with fail-fast semantics.

When to use

Use when you need to reduce Option values with fail-fast semantics, where any None aborts the entire result instead of being skipped.

Details

• Initial value is Some(reducer.initialValue)
• Combines only when both operands are Some
• Any None causes the result to become None immediately

Example (Fail-fast reducing)

import { Number, Option } from "effect"

const reducer = Option.makeReducerFailFast(Number.ReducerSum)
console.log(reducer.combineAll([Option.some(1), Option.some(2)]))
// Output: { _id: 'Option', _tag: 'Some', value: 3 }

console.log(reducer.combineAll([Option.some(1), Option.none()]))
// Output: { _id: 'Option', _tag: 'None' }

See

• makeCombinerFailFast for just the combiner
• makeReducer for non-fail-fast semantics

Signature

declare const makeReducerFailFast: <A>(reducer: Reducer.Reducer<A>) => Reducer.Reducer<Option<A>>

Source

Since v4.0.0