effect-io-ai

Package: effect
Module: Result

Result.fromNullishOr

Converts a possibly null or undefined value into a Result.

When to use

Use when you need null or undefined input to become a Failure while present values remain available as Success.

Details

• Non-nullish values become Success<NonNullable<A>>
• null or undefined becomes Failure<E> using the provided function
• Supports both data-first and data-last (piped) usage
• The onNullish callback receives the original value

Example (Handling nullable values)

import { Result } from "effect"

console.log(Result.fromNullishOr(1, () => "fallback"))
// Output: { _tag: "Success", success: 1, ... }

console.log(Result.fromNullishOr(null, () => "fallback"))
// Output: { _tag: "Failure", failure: "fallback", ... }

See

• fromOption to convert from an Option
• succeed / fail for direct construction

Signature

declare const fromNullishOr: { <A, E>(onNullish: (a: A) => E): (self: A) => Result<NonNullable<A>, E>; <A, E>(self: A, onNullish: (a: A) => E): Result<NonNullable<A>, E>; }

Source

Since v4.0.0