@effect-ts/system/_src/Effect/someOrElse.ts

Effect-TS is a zero dependency set of libraries to write highly productive, purely functional TypeScript at scale.

// ets_tracing: off

import * as O from "../Option/index.js"
import type { Effect } from "./effect.js"
import { map_ } from "./map.js"

/**
 * Extracts the optional value, or returns the given 'orElse'.
 */
export function someOrElse<B>(orElse: () => B, __trace?: string) {
  return <R, E, A>(self: Effect<R, E, O.Option<A>>) =>
    someOrElse_(self, orElse, __trace)
}

/**
 * Extracts the optional value, or returns the given 'orElse'.
 */
export function someOrElse_<R, E, A, B>(
  self: Effect<R, E, O.Option<A>>,
  orElse: () => B,
  __trace?: string
): Effect<R, E, A | B> {
  return map_(self, O.getOrElse(orElse), __trace)
}