@typed/fp/esm/Option.js

Data Structures and Resources for fp-ts

import * as E from 'fp-ts/Either';
import { pipe } from 'fp-ts/function';
import * as O from 'fp-ts/Option';
import * as S from './struct';
/**
 * @since 0.9.2
 * @category Combinator
 */
export const chainRec = (f) => (value) => {
    let option = f(value);
    while (O.isSome(option)) {
        if (E.isRight(option.value)) {
            return O.some(option.value.right);
        }
        option = f(option.value.left);
    }
    return option;
};
/**
 * @since 0.12.1
 * @category Constructor
 */
export const struct = (opts) => {
    const { concat } = O.getMonoid(S.getAssignSemigroup());
    const entries = Object.entries(opts);
    return entries.reduce((acc, [k, o]) => pipe(acc, concat(pipe(o, O.map((v) => S.make(k, v))))), O.none);
};
/**
 * @since 0.9.2
 * @category Typeclass
 */
export const ChainRec = {
    chainRec,
};
/**
 * @since 0.9.2
 * @category Typeclass
 */
export const MonadRec = {
    ...O.Monad,
    ...ChainRec,
};
export * from 'fp-ts/Option';
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