/**
 * ```ts
 * interface Separated<E, A> {
 *    readonly left: E
 *    readonly right: A
 * }
 * ```
 *
 * Represents a result of separating a whole into two parts.
 *
 * @since 2.10.0
 */
import { pipe } from './function';
import { flap as flap_ } from './Functor';
// -------------------------------------------------------------------------------------
// constructors
// -------------------------------------------------------------------------------------
/**
 * @category constructors
 * @since 2.10.0
 */
export var separated = function (left, right) { return ({ left: left, right: right }); };
var _map = function (fa, f) { return pipe(fa, map(f)); };
var _mapLeft = function (fa, f) { return pipe(fa, mapLeft(f)); };
var _bimap = function (fa, g, f) { return pipe(fa, bimap(g, f)); };
/**
 * `map` can be used to turn functions `(a: A) => B` into functions `(fa: F<A>) => F<B>` whose argument and return types
 * use the type constructor `F` to represent some computational context.
 *
 * @category mapping
 * @since 2.10.0
 */
export var map = function (f) {
    return function (fa) {
        return separated(left(fa), f(right(fa)));
    };
};
/**
 * Map a function over the first type argument of a bifunctor.
 *
 * @category error handling
 * @since 2.10.0
 */
export var mapLeft = function (f) {
    return function (fa) {
        return separated(f(left(fa)), right(fa));
    };
};
/**
 * Map a pair of functions over the two type arguments of the bifunctor.
 *
 * @category mapping
 * @since 2.10.0
 */
export var bimap = function (f, g) {
    return function (fa) {
        return separated(f(left(fa)), g(right(fa)));
    };
};
/**
 * @category type lambdas
 * @since 2.10.0
 */
export var URI = 'Separated';
/**
 * @category instances
 * @since 2.10.0
 */
export var Bifunctor = {
    URI: URI,
    mapLeft: _mapLeft,
    bimap: _bimap
};
/**
 * @category instances
 * @since 2.10.0
 */
export var Functor = {
    URI: URI,
    map: _map
};
/**
 * @category mapping
 * @since 2.10.0
 */
export var flap = /*#__PURE__*/ flap_(Functor);
// -------------------------------------------------------------------------------------
// utils
// -------------------------------------------------------------------------------------
/**
 * @since 2.10.0
 */
export var left = function (s) { return s.left; };
/**
 * @since 2.10.0
 */
export var right = function (s) { return s.right; };