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"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
exports.match = exports.foldW = exports.matchW = exports.isRight = exports.isLeft = exports.fromOption = exports.fromPredicate = exports.FromEither = exports.MonadThrow = exports.throwError = exports.ChainRec = exports.Extend = exports.extend = exports.Alt = exports.alt = exports.altW = exports.Bifunctor = exports.mapLeft = exports.bimap = exports.Traversable = exports.sequence = exports.traverse = exports.Foldable = exports.reduceRight = exports.foldMap = exports.reduce = exports.Monad = exports.Chain = exports.Applicative = exports.Apply = exports.ap = exports.apW = exports.Pointed = exports.of = exports.asUnit = exports.as = exports.Functor = exports.map = exports.getAltValidation = exports.getApplicativeValidation = exports.getWitherable = exports.getFilterable = exports.getCompactable = exports.getSemigroup = exports.getEq = exports.getShow = exports.URI = exports.flatMap = exports.right = exports.left = void 0;
exports.either = exports.stringifyJSON = exports.chainFirstW = exports.chainFirst = exports.chain = exports.chainW = exports.sequenceArray = exports.traverseArray = exports.traverseArrayWithIndex = exports.traverseReadonlyArrayWithIndex = exports.traverseReadonlyNonEmptyArrayWithIndex = exports.ApT = exports.apSW = exports.apS = exports.bindW = exports.bind = exports.let = exports.bindTo = exports.Do = exports.exists = exports.toUnion = exports.chainNullableK = exports.fromNullableK = exports.tryCatchK = exports.tryCatch = exports.fromNullable = exports.orElse = exports.orElseW = exports.swap = exports.filterOrElseW = exports.filterOrElse = exports.flatMapOption = exports.flatMapNullable = exports.liftOption = exports.liftNullable = exports.chainOptionKW = exports.chainOptionK = exports.fromOptionK = exports.duplicate = exports.flatten = exports.flattenW = exports.tap = exports.apSecondW = exports.apSecond = exports.apFirstW = exports.apFirst = exports.flap = exports.getOrElse = exports.getOrElseW = exports.fold = void 0;
exports.getValidationMonoid = exports.getValidationSemigroup = exports.getApplyMonoid = exports.getApplySemigroup = void 0;
exports.toError = toError;
exports.elem = elem;
exports.parseJSON = parseJSON;
exports.getValidation = getValidation;
var Applicative_1 = require("./Applicative");
var Apply_1 = require("./Apply");
var chainable = __importStar(require("./Chain"));
var ChainRec_1 = require("./ChainRec");
var FromEither_1 = require("./FromEither");
var function_1 = require("./function");
var Functor_1 = require("./Functor");
var _ = __importStar(require("./internal"));
var Separated_1 = require("./Separated");
var Witherable_1 = require("./Witherable");
// -------------------------------------------------------------------------------------
// constructors
// -------------------------------------------------------------------------------------
/**
* Constructs a new `Either` holding a `Left` value. This usually represents a failure, due to the right-bias of this
* structure.
*
* @category constructors
* @since 2.0.0
*/
exports.left = _.left;
/**
* Constructs a new `Either` holding a `Right` value. This usually represents a successful value due to the right bias
* of this structure.
*
* @category constructors
* @since 2.0.0
*/
exports.right = _.right;
/**
* @category sequencing
* @since 2.14.0
*/
exports.flatMap = (0, function_1.dual)(2, function (ma, f) { return ((0, exports.isLeft)(ma) ? ma : f(ma.right)); });
var _map = function (fa, f) { return (0, function_1.pipe)(fa, (0, exports.map)(f)); };
var _ap = function (fab, fa) { return (0, function_1.pipe)(fab, (0, exports.ap)(fa)); };
/* istanbul ignore next */
var _reduce = function (fa, b, f) { return (0, function_1.pipe)(fa, (0, exports.reduce)(b, f)); };
/* istanbul ignore next */
var _foldMap = function (M) { return function (fa, f) {
var foldMapM = (0, exports.foldMap)(M);
return (0, function_1.pipe)(fa, foldMapM(f));
}; };
/* istanbul ignore next */
var _reduceRight = function (fa, b, f) { return (0, function_1.pipe)(fa, (0, exports.reduceRight)(b, f)); };
var _traverse = function (F) {
var traverseF = (0, exports.traverse)(F);
return function (ta, f) { return (0, function_1.pipe)(ta, traverseF(f)); };
};
var _bimap = function (fa, f, g) { return (0, function_1.pipe)(fa, (0, exports.bimap)(f, g)); };
var _mapLeft = function (fa, f) { return (0, function_1.pipe)(fa, (0, exports.mapLeft)(f)); };
/* istanbul ignore next */
var _alt = function (fa, that) { return (0, function_1.pipe)(fa, (0, exports.alt)(that)); };
/* istanbul ignore next */
var _extend = function (wa, f) { return (0, function_1.pipe)(wa, (0, exports.extend)(f)); };
var _chainRec = function (a, f) {
return (0, ChainRec_1.tailRec)(f(a), function (e) {
return (0, exports.isLeft)(e) ? (0, exports.right)((0, exports.left)(e.left)) : (0, exports.isLeft)(e.right) ? (0, exports.left)(f(e.right.left)) : (0, exports.right)((0, exports.right)(e.right.right));
});
};
/**
* @category type lambdas
* @since 2.0.0
*/
exports.URI = 'Either';
/**
* @category instances
* @since 2.0.0
*/
var getShow = function (SE, SA) { return ({
show: function (ma) { return ((0, exports.isLeft)(ma) ? "left(".concat(SE.show(ma.left), ")") : "right(".concat(SA.show(ma.right), ")")); }
}); };
exports.getShow = getShow;
/**
* @category instances
* @since 2.0.0
*/
var getEq = function (EL, EA) { return ({
equals: function (x, y) {
return x === y || ((0, exports.isLeft)(x) ? (0, exports.isLeft)(y) && EL.equals(x.left, y.left) : (0, exports.isRight)(y) && EA.equals(x.right, y.right));
}
}); };
exports.getEq = getEq;
/**
* Semigroup returning the left-most non-`Left` value. If both operands are `Right`s then the inner values are
* concatenated using the provided `Semigroup`
*
* @example
* import { getSemigroup, left, right } from 'fp-ts/Either'
* import { SemigroupSum } from 'fp-ts/number'
*
* const S = getSemigroup<string, number>(SemigroupSum)
* assert.deepStrictEqual(S.concat(left('a'), left('b')), left('a'))
* assert.deepStrictEqual(S.concat(left('a'), right(2)), right(2))
* assert.deepStrictEqual(S.concat(right(1), left('b')), right(1))
* assert.deepStrictEqual(S.concat(right(1), right(2)), right(3))
*
* @category instances
* @since 2.0.0
*/
var getSemigroup = function (S) { return ({
concat: function (x, y) { return ((0, exports.isLeft)(y) ? x : (0, exports.isLeft)(x) ? y : (0, exports.right)(S.concat(x.right, y.right))); }
}); };
exports.getSemigroup = getSemigroup;
/**
* Builds a `Compactable` instance for `Either` given `Monoid` for the left side.
*
* @category filtering
* @since 2.10.0
*/
var getCompactable = function (M) {
var empty = (0, exports.left)(M.empty);
return {
URI: exports.URI,
_E: undefined,
compact: function (ma) { return ((0, exports.isLeft)(ma) ? ma : ma.right._tag === 'None' ? empty : (0, exports.right)(ma.right.value)); },
separate: function (ma) {
return (0, exports.isLeft)(ma)
? (0, Separated_1.separated)(ma, ma)
: (0, exports.isLeft)(ma.right)
? (0, Separated_1.separated)((0, exports.right)(ma.right.left), empty)
: (0, Separated_1.separated)(empty, (0, exports.right)(ma.right.right));
}
};
};
exports.getCompactable = getCompactable;
/**
* Builds a `Filterable` instance for `Either` given `Monoid` for the left side
*
* @category filtering
* @since 2.10.0
*/
var getFilterable = function (M) {
var empty = (0, exports.left)(M.empty);
var _a = (0, exports.getCompactable)(M), compact = _a.compact, separate = _a.separate;
var filter = function (ma, predicate) {
return (0, exports.isLeft)(ma) ? ma : predicate(ma.right) ? ma : empty;
};
var partition = function (ma, p) {
return (0, exports.isLeft)(ma)
? (0, Separated_1.separated)(ma, ma)
: p(ma.right)
? (0, Separated_1.separated)(empty, (0, exports.right)(ma.right))
: (0, Separated_1.separated)((0, exports.right)(ma.right), empty);
};
return {
URI: exports.URI,
_E: undefined,
map: _map,
compact: compact,
separate: separate,
filter: filter,
filterMap: function (ma, f) {
if ((0, exports.isLeft)(ma)) {
return ma;
}
var ob = f(ma.right);
return ob._tag === 'None' ? empty : (0, exports.right)(ob.value);
},
partition: partition,
partitionMap: function (ma, f) {
if ((0, exports.isLeft)(ma)) {
return (0, Separated_1.separated)(ma, ma);
}
var e = f(ma.right);
return (0, exports.isLeft)(e) ? (0, Separated_1.separated)((0, exports.right)(e.left), empty) : (0, Separated_1.separated)(empty, (0, exports.right)(e.right));
}
};
};
exports.getFilterable = getFilterable;
/**
* Builds `Witherable` instance for `Either` given `Monoid` for the left side
*
* @category filtering
* @since 2.0.0
*/
var getWitherable = function (M) {
var F_ = (0, exports.getFilterable)(M);
var C = (0, exports.getCompactable)(M);
return {
URI: exports.URI,
_E: undefined,
map: _map,
compact: F_.compact,
separate: F_.separate,
filter: F_.filter,
filterMap: F_.filterMap,
partition: F_.partition,
partitionMap: F_.partitionMap,
traverse: _traverse,
sequence: exports.sequence,
reduce: _reduce,
foldMap: _foldMap,
reduceRight: _reduceRight,
wither: (0, Witherable_1.witherDefault)(exports.Traversable, C),
wilt: (0, Witherable_1.wiltDefault)(exports.Traversable, C)
};
};
exports.getWitherable = getWitherable;
/**
* The default [`Applicative`](#applicative) instance returns the first error, if you want to
* get all errors you need to provide a way to concatenate them via a `Semigroup`.
*
* @example
* import * as A from 'fp-ts/Apply'
* import * as E from 'fp-ts/Either'
* import { pipe } from 'fp-ts/function'
* import * as S from 'fp-ts/Semigroup'
* import * as string from 'fp-ts/string'
*
* const parseString = (u: unknown): E.Either<string, string> =>
* typeof u === 'string' ? E.right(u) : E.left('not a string')
*
* const parseNumber = (u: unknown): E.Either<string, number> =>
* typeof u === 'number' ? E.right(u) : E.left('not a number')
*
* interface Person {
* readonly name: string
* readonly age: number
* }
*
* const parsePerson = (
* input: Record<string, unknown>
* ): E.Either<string, Person> =>
* pipe(
* E.Do,
* E.apS('name', parseString(input.name)),
* E.apS('age', parseNumber(input.age))
* )
*
* assert.deepStrictEqual(parsePerson({}), E.left('not a string')) // <= first error
*
* const Applicative = E.getApplicativeValidation(
* pipe(string.Semigroup, S.intercalate(', '))
* )
*
* const apS = A.apS(Applicative)
*
* const parsePersonAll = (
* input: Record<string, unknown>
* ): E.Either<string, Person> =>
* pipe(
* E.Do,
* apS('name', parseString(input.name)),
* apS('age', parseNumber(input.age))
* )
*
* assert.deepStrictEqual(parsePersonAll({}), E.left('not a string, not a number')) // <= all errors
*
* @category error handling
* @since 2.7.0
*/
var getApplicativeValidation = function (SE) { return ({
URI: exports.URI,
_E: undefined,
map: _map,
ap: function (fab, fa) {
return (0, exports.isLeft)(fab)
? (0, exports.isLeft)(fa)
? (0, exports.left)(SE.concat(fab.left, fa.left))
: fab
: (0, exports.isLeft)(fa)
? fa
: (0, exports.right)(fab.right(fa.right));
},
of: exports.of
}); };
exports.getApplicativeValidation = getApplicativeValidation;
/**
* The default [`Alt`](#alt) instance returns the last error, if you want to
* get all errors you need to provide a way to concatenate them via a `Semigroup`.
*
* @example
* import * as E from 'fp-ts/Either'
* import { pipe } from 'fp-ts/function'
* import * as S from 'fp-ts/Semigroup'
* import * as string from 'fp-ts/string'
*
* const parseString = (u: unknown): E.Either<string, string> =>
* typeof u === 'string' ? E.right(u) : E.left('not a string')
*
* const parseNumber = (u: unknown): E.Either<string, number> =>
* typeof u === 'number' ? E.right(u) : E.left('not a number')
*
* const parse = (u: unknown): E.Either<string, string | number> =>
* pipe(
* parseString(u),
* E.alt<string, string | number>(() => parseNumber(u))
* )
*
* assert.deepStrictEqual(parse(true), E.left('not a number')) // <= last error
*
* const Alt = E.getAltValidation(pipe(string.Semigroup, S.intercalate(', ')))
*
* const parseAll = (u: unknown): E.Either<string, string | number> =>
* Alt.alt<string | number>(parseString(u), () => parseNumber(u))
*
* assert.deepStrictEqual(parseAll(true), E.left('not a string, not a number')) // <= all errors
*
* @category error handling
* @since 2.7.0
*/
var getAltValidation = function (SE) { return ({
URI: exports.URI,
_E: undefined,
map: _map,
alt: function (me, that) {
if ((0, exports.isRight)(me)) {
return me;
}
var ea = that();
return (0, exports.isLeft)(ea) ? (0, exports.left)(SE.concat(me.left, ea.left)) : ea;
}
}); };
exports.getAltValidation = getAltValidation;
/**
* @category mapping
* @since 2.0.0
*/
var map = function (f) { return function (fa) {
return (0, exports.isLeft)(fa) ? fa : (0, exports.right)(f(fa.right));
}; };
exports.map = map;
/**
* @category instances
* @since 2.7.0
*/
exports.Functor = {
URI: exports.URI,
map: _map
};
/**
* Maps the `Right` value of this `Either` to the specified constant value.
*
* @category mapping
* @since 2.16.0
*/
exports.as = (0, function_1.dual)(2, (0, Functor_1.as)(exports.Functor));
/**
* Maps the `Right` value of this `Either` to the void constant value.
*
* @category mapping
* @since 2.16.0
*/
exports.asUnit = (0, Functor_1.asUnit)(exports.Functor);
/**
* @category constructors
* @since 2.7.0
*/
exports.of = exports.right;
/**
* @category instances
* @since 2.10.0
*/
exports.Pointed = {
URI: exports.URI,
of: exports.of
};
/**
* Less strict version of [`ap`](#ap).
*
* The `W` suffix (short for **W**idening) means that the error types will be merged.
*
* @since 2.8.0
*/
var apW = function (fa) { return function (fab) {
return (0, exports.isLeft)(fab) ? fab : (0, exports.isLeft)(fa) ? fa : (0, exports.right)(fab.right(fa.right));
}; };
exports.apW = apW;
/**
* @since 2.0.0
*/
exports.ap = exports.apW;
/**
* @category instances
* @since 2.10.0
*/
exports.Apply = {
URI: exports.URI,
map: _map,
ap: _ap
};
/**
* @category instances
* @since 2.7.0
*/
exports.Applicative = {
URI: exports.URI,
map: _map,
ap: _ap,
of: exports.of
};
/**
* @category instances
* @since 2.10.0
*/
exports.Chain = {
URI: exports.URI,
map: _map,
ap: _ap,
chain: exports.flatMap
};
/**
* @category instances
* @since 2.7.0
*/
exports.Monad = {
URI: exports.URI,
map: _map,
ap: _ap,
of: exports.of,
chain: exports.flatMap
};
/**
* Left-associative fold of a structure.
*
* @example
* import { pipe } from 'fp-ts/function'
* import * as E from 'fp-ts/Either'
*
* const startWith = 'prefix'
* const concat = (a: string, b: string) => `${a}:${b}`
*
* assert.deepStrictEqual(
* pipe(E.right('a'), E.reduce(startWith, concat)),
* 'prefix:a'
* )
*
* assert.deepStrictEqual(
* pipe(E.left('e'), E.reduce(startWith, concat)),
* 'prefix'
* )
*
* @category folding
* @since 2.0.0
*/
var reduce = function (b, f) { return function (fa) {
return (0, exports.isLeft)(fa) ? b : f(b, fa.right);
}; };
exports.reduce = reduce;
/**
* Map each element of the structure to a monoid, and combine the results.
*
* @example
* import { pipe } from 'fp-ts/function'
* import * as E from 'fp-ts/Either'
* import * as S from 'fp-ts/string'
*
* const yell = (a: string) => `${a}!`
*
* assert.deepStrictEqual(
* pipe(E.right('a'), E.foldMap(S.Monoid)(yell)),
* 'a!'
* )
*
* assert.deepStrictEqual(
* pipe(E.left('e'), E.foldMap(S.Monoid)(yell)),
* S.Monoid.empty
* )
*
* @category folding
* @since 2.0.0
*/
var foldMap = function (M) { return function (f) { return function (fa) {
return (0, exports.isLeft)(fa) ? M.empty : f(fa.right);
}; }; };
exports.foldMap = foldMap;
/**
* Right-associative fold of a structure.
*
* @example
* import { pipe } from 'fp-ts/function'
* import * as E from 'fp-ts/Either'
*
* const startWith = 'postfix'
* const concat = (a: string, b: string) => `${a}:${b}`
*
* assert.deepStrictEqual(
* pipe(E.right('a'), E.reduceRight(startWith, concat)),
* 'a:postfix'
* )
*
* assert.deepStrictEqual(
* pipe(E.left('e'), E.reduceRight(startWith, concat)),
* 'postfix'
* )
*
* @category folding
* @since 2.0.0
*/
var reduceRight = function (b, f) { return function (fa) {
return (0, exports.isLeft)(fa) ? b : f(fa.right, b);
}; };
exports.reduceRight = reduceRight;
/**
* @category instances
* @since 2.7.0
*/
exports.Foldable = {
URI: exports.URI,
reduce: _reduce,
foldMap: _foldMap,
reduceRight: _reduceRight
};
/**
* Map each element of a structure to an action, evaluate these actions from left to right, and collect the results.
*
* @example
* import { pipe } from 'fp-ts/function'
* import * as RA from 'fp-ts/ReadonlyArray'
* import * as E from 'fp-ts/Either'
* import * as O from 'fp-ts/Option'
*
* assert.deepStrictEqual(
* pipe(E.right(['a']), E.traverse(O.Applicative)(RA.head)),
* O.some(E.right('a'))
* )
*
* assert.deepStrictEqual(
* pipe(E.right([]), E.traverse(O.Applicative)(RA.head)),
* O.none
* )
*
* @category traversing
* @since 2.6.3
*/
var traverse = function (F) {
return function (f) {
return function (ta) {
return (0, exports.isLeft)(ta) ? F.of((0, exports.left)(ta.left)) : F.map(f(ta.right), exports.right);
};
};
};
exports.traverse = traverse;
/**
* Evaluate each monadic action in the structure from left to right, and collect the results.
*
* @example
* import { pipe } from 'fp-ts/function'
* import * as E from 'fp-ts/Either'
* import * as O from 'fp-ts/Option'
*
* assert.deepStrictEqual(
* pipe(E.right(O.some('a')), E.sequence(O.Applicative)),
* O.some(E.right('a'))
* )
*
* assert.deepStrictEqual(
* pipe(E.right(O.none), E.sequence(O.Applicative)),
* O.none
* )
*
* @category traversing
* @since 2.6.3
*/
var sequence = function (F) {
return function (ma) {
return (0, exports.isLeft)(ma) ? F.of((0, exports.left)(ma.left)) : F.map(ma.right, exports.right);
};
};
exports.sequence = sequence;
/**
* @category instances
* @since 2.7.0
*/
exports.Traversable = {
URI: exports.URI,
map: _map,
reduce: _reduce,
foldMap: _foldMap,
reduceRight: _reduceRight,
traverse: _traverse,
sequence: exports.sequence
};
/**
* Map a pair of functions over the two type arguments of the bifunctor.
*
* @category mapping
* @since 2.0.0
*/
var bimap = function (f, g) { return function (fa) {
return (0, exports.isLeft)(fa) ? (0, exports.left)(f(fa.left)) : (0, exports.right)(g(fa.right));
}; };
exports.bimap = bimap;
/**
* Map a function over the first type argument of a bifunctor.
*
* @category error handling
* @since 2.0.0
*/
var mapLeft = function (f) { return function (fa) {
return (0, exports.isLeft)(fa) ? (0, exports.left)(f(fa.left)) : fa;
}; };
exports.mapLeft = mapLeft;
/**
* @category instances
* @since 2.7.0
*/
exports.Bifunctor = {
URI: exports.URI,
bimap: _bimap,
mapLeft: _mapLeft
};
/**
* Less strict version of [`alt`](#alt).
*
* The `W` suffix (short for **W**idening) means that the error and the return types will be merged.
*
* @category error handling
* @since 2.9.0
*/
var altW = function (that) { return function (fa) {
return (0, exports.isLeft)(fa) ? that() : fa;
}; };
exports.altW = altW;
/**
* Identifies an associative operation on a type constructor. It is similar to `Semigroup`, except that it applies to
* types of kind `* -> *`.
*
* In case of `Either` returns the left-most non-`Left` value (or the right-most `Left` value if both values are `Left`).
*
* | x | y | pipe(x, alt(() => y) |
* | -------- | -------- | -------------------- |
* | left(a) | left(b) | left(b) |
* | left(a) | right(2) | right(2) |
* | right(1) | left(b) | right(1) |
* | right(1) | right(2) | right(1) |
*
* @example
* import * as E from 'fp-ts/Either'
* import { pipe } from 'fp-ts/function'
*
* assert.deepStrictEqual(
* pipe(
* E.left('a'),
* E.alt(() => E.left('b'))
* ),
* E.left('b')
* )
* assert.deepStrictEqual(
* pipe(
* E.left('a'),
* E.alt(() => E.right(2))
* ),
* E.right(2)
* )
* assert.deepStrictEqual(
* pipe(
* E.right(1),
* E.alt(() => E.left('b'))
* ),
* E.right(1)
* )
* assert.deepStrictEqual(
* pipe(
* E.right(1),
* E.alt(() => E.right(2))
* ),
* E.right(1)
* )
*
* @category error handling
* @since 2.0.0
*/
exports.alt = exports.altW;
/**
* @category instances
* @since 2.7.0
*/
exports.Alt = {
URI: exports.URI,
map: _map,
alt: _alt
};
/**
* @since 2.0.0
*/
var extend = function (f) { return function (wa) {
return (0, exports.isLeft)(wa) ? wa : (0, exports.right)(f(wa));
}; };
exports.extend = extend;
/**
* @category instances
* @since 2.7.0
*/
exports.Extend = {
URI: exports.URI,
map: _map,
extend: _extend
};
/**
* @category instances
* @since 2.7.0
*/
exports.ChainRec = {
URI: exports.URI,
map: _map,
ap: _ap,
chain: exports.flatMap,
chainRec: _chainRec
};
/**
* @since 2.6.3
*/
exports.throwError = exports.left;
/**
* @category instances
* @since 2.7.0
*/
exports.MonadThrow = {
URI: exports.URI,
map: _map,
ap: _ap,
of: exports.of,
chain: exports.flatMap,
throwError: exports.throwError
};
/**
* @category instances
* @since 2.10.0
*/
exports.FromEither = {
URI: exports.URI,
fromEither: function_1.identity
};
/**
* @example
* import { fromPredicate, left, right } from 'fp-ts/Either'
* import { pipe } from 'fp-ts/function'
*
* assert.deepStrictEqual(
* pipe(
* 1,
* fromPredicate(
* (n) => n > 0,
* () => 'error'
* )
* ),
* right(1)
* )
* assert.deepStrictEqual(
* pipe(
* -1,
* fromPredicate(
* (n) => n > 0,
* () => 'error'
* )
* ),
* left('error')
* )
*
* @category lifting
* @since 2.0.0
*/
exports.fromPredicate = (0, FromEither_1.fromPredicate)(exports.FromEither);
// -------------------------------------------------------------------------------------
// conversions
// -------------------------------------------------------------------------------------
/**
* @example
* import * as E from 'fp-ts/Either'
* import { pipe } from 'fp-ts/function'
* import * as O from 'fp-ts/Option'
*
* assert.deepStrictEqual(
* pipe(
* O.some(1),
* E.fromOption(() => 'error')
* ),
* E.right(1)
* )
* assert.deepStrictEqual(
* pipe(
* O.none,
* E.fromOption(() => 'error')
* ),
* E.left('error')
* )
*
* @category conversions
* @since 2.0.0
*/
exports.fromOption =
/*#__PURE__*/ (0, FromEither_1.fromOption)(exports.FromEither);
// -------------------------------------------------------------------------------------
// refinements
// -------------------------------------------------------------------------------------
/**
* Returns `true` if the either is an instance of `Left`, `false` otherwise.
*
* @category refinements
* @since 2.0.0
*/
exports.isLeft = _.isLeft;
/**
* Returns `true` if the either is an instance of `Right`, `false` otherwise.
*
* @category refinements
* @since 2.0.0
*/
exports.isRight = _.isRight;
/**
* Less strict version of [`match`](#match).
*
* The `W` suffix (short for **W**idening) means that the handler return types will be merged.
*
* @category pattern matching
* @since 2.10.0
*/
var matchW = function (onLeft, onRight) {
return function (ma) {
return (0, exports.isLeft)(ma) ? onLeft(ma.left) : onRight(ma.right);
};
};
exports.matchW = matchW;
/**
* Alias of [`matchW`](#matchw).
*
* @category pattern matching
* @since 2.10.0
*/
exports.foldW = exports.matchW;
/**
* Takes two functions and an `Either` value, if the value is a `Left` the inner value is applied to the first function,
* if the value is a `Right` the inner value is applied to the second function.
*
* @example
* import { match, left, right } from 'fp-ts/Either'
* import { pipe } from 'fp-ts/function'
*
* function onLeft(errors: Array<string>): string {
* return `Errors: ${errors.join(', ')}`
* }
*
* function onRight(value: number): string {
* return `Ok: ${value}`
* }
*
* assert.strictEqual(
* pipe(
* right(1),
* match(onLeft, onRight)
* ),
* 'Ok: 1'
* )
* assert.strictEqual(
* pipe(
* left(['error 1', 'error 2']),
* match(onLeft, onRight)
* ),
* 'Errors: error 1, error 2'
* )
*
* @category pattern matching
* @since 2.10.0
*/
exports.match = exports.matchW;
/**
* Alias of [`match`](#match).
*
* @category pattern matching
* @since 2.0.0
*/
exports.fold = exports.match;
/**
* Less strict version of [`getOrElse`](#getorelse).
*
* The `W` suffix (short for **W**idening) means that the handler return type will be merged.
*
* @category error handling
* @since 2.6.0
*/
var getOrElseW = function (onLeft) {
return function (ma) {
return (0, exports.isLeft)(ma) ? onLeft(ma.left) : ma.right;
};
};
exports.getOrElseW = getOrElseW;
/**
* Returns the wrapped value if it's a `Right` or a default value if is a `Left`.
*
* @example
* import { getOrElse, left, right } from 'fp-ts/Either'
* import { pipe } from 'fp-ts/function'
*
* assert.deepStrictEqual(
* pipe(
* right(1),
* getOrElse(() => 0)
* ),
* 1
* )
* assert.deepStrictEqual(
* pipe(
* left('error'),
* getOrElse(() => 0)
* ),
* 0
* )
*
* @category error handling
* @since 2.0.0
*/
exports.getOrElse = exports.getOrElseW;
// -------------------------------------------------------------------------------------
// combinators
// -------------------------------------------------------------------------------------
/**
* @category mapping
* @since 2.10.0
*/
exports.flap = (0, Functor_1.flap)(exports.Functor);
/**
* Combine two effectful actions, keeping only the result of the first.
*
* @since 2.0.0
*/
exports.apFirst = (0, Apply_1.apFirst)(exports.Apply);
/**
* Less strict version of [`apFirst`](#apfirst)
*
* The `W` suffix (short for **W**idening) means that the error types will be merged.
*
* @since 2.12.0
*/
exports.apFirstW = exports.apFirst;
/**
* Combine two effectful actions, keeping only the result of the second.
*
* @since 2.0.0
*/
exports.apSecond = (0, Apply_1.apSecond)(exports.Apply);
/**
* Less strict version of [`apSecond`](#apsecond)
*
* The `W` suffix (short for **W**idening) means that the error types will be merged.
*
* @since 2.12.0
*/
exports.apSecondW = exports.apSecond;
/**
* Composes computations in sequence, using the return value of one computation to determine the next computation and
* keeping only the result of the first.
*
* @category combinators
* @since 2.15.0
*/
exports.tap = (0, function_1.dual)(2, chainable.tap(exports.Chain));
/**
* Less strict version of [`flatten`](#flatten).
*
* The `W` suffix (short for **W**idening) means that the error types will be merged.
*
* @category sequencing
* @since 2.11.0
*/
exports.flattenW =
/*#__PURE__*/ (0, exports.flatMap)(function_1.identity);
/**
* The `flatten` function is the conventional monad join operator. It is used to remove one level of monadic structure, projecting its bound argument into the outer level.
*
* @example
* import * as E from 'fp-ts/Either'
*
* assert.deepStrictEqual(E.flatten(E.right(E.right('a'))), E.right('a'))
* assert.deepStrictEqual(E.flatten(E.right(E.left('e'))), E.left('e'))
* assert.deepStrictEqual(E.flatten(E.left('e')), E.left('e'))
*
* @category sequencing
* @since 2.0.0
*/
exports.flatten = exports.flattenW;
/**
* @since 2.0.0
*/
exports.duplicate = (0, exports.extend)(function_1.identity);
/**
* Use `liftOption`.
*
* @category legacy
* @since 2.10.0
*/
exports.fromOptionK =
/*#__PURE__*/ (0, FromEither_1.fromOptionK)(exports.FromEither);
/**
* Use `flatMapOption`.
*
* @category legacy
* @since 2.11.0
*/
exports.chainOptionK = (0, FromEither_1.chainOptionK)(exports.FromEither, exports.Chain);
/**
* Use `flatMapOption`.
*
* @category legacy
* @since 2.13.2
*/
exports.chainOptionKW = exports.chainOptionK;
/** @internal */
var _FromEither = {
fromEither: exports.FromEither.fromEither
};
/**
* @category lifting
* @since 2.15.0
*/
exports.liftNullable = _.liftNullable(_FromEither);
/**
* @category lifting
* @since 2.15.0
*/
exports.liftOption = _.liftOption(_FromEither);
/** @internal */
var _FlatMap = {
flatMap: exports.flatMap
};
/**
* @category sequencing
* @since 2.15.0
*/
exports.flatMapNullable = _.flatMapNullable(_FromEither, _FlatMap);
/**
* @category sequencing
* @since 2.15.0
*/
exports.flatMapOption = _.flatMapOption(_FromEither, _FlatMap);
/**
* @example
* import * as E from 'fp-ts/Either'
* import { pipe } from 'fp-ts/function'
*
* assert.deepStrictEqual(
* pipe(
* E.right(1),
* E.filterOrElse(
* (n) => n > 0,
* () => 'error'
* )
* ),
* E.right(1)
* )
* assert.deepStrictEqual(
* pipe(
* E.right(-1),
* E.filterOrElse(
* (n) => n > 0,
* () => 'error'
* )
* ),
* E.left('error')
* )
* assert.deepStrictEqual(
* pipe(
* E.left('a'),
* E.filterOrElse(
* (n) => n > 0,
* () => 'error'
* )
* ),
* E.left('a')
* )
*
* @category filtering
* @since 2.0.0
*/
exports.filterOrElse = (0, FromEither_1.filterOrElse)(exports.FromEither, exports.Chain);
/**
* Less strict version of [`filterOrElse`](#filterorelse).
*
* The `W` suffix (short for **W**idening) means that the error types will be merged.
*
* @category filtering
* @since 2.9.0
*/
exports.filterOrElseW = exports.filterOrElse;
/**
* Returns a `Right` if is a `Left` (and vice versa).
*
* @since 2.0.0
*/
var swap = function (ma) { return ((0, exports.isLeft)(ma) ? (0, exports.right)(ma.left) : (0, exports.left)(ma.right)); };
exports.swap = swap;
/**
* Less strict version of [`orElse`](#orelse).
*
* The `W` suffix (short for **W**idening) means that the return types will be merged.
*
* @category error handling
* @since 2.10.0
*/
var orElseW = function (onLeft) {
return function (ma) {
return (0, exports.isLeft)(ma) ? onLeft(ma.left) : ma;
};
};
exports.orElseW = orElseW;
/**
* Useful for recovering from errors.
*
* @category error handling
* @since 2.0.0
*/
exports.orElse = exports.orElseW;
/**
* Takes a default and a nullable value, if the value is not nully, turn it into a `Right`, if the value is nully use
* the provided default as a `Left`.
*
* @example
* import { fromNullable, left, right } from 'fp-ts/Either'
*
* const parse = fromNullable('nully')
*
* assert.deepStrictEqual(parse(1), right(1))
* assert.deepStrictEqual(parse(null), left('nully'))
*
* @category conversions
* @since 2.0.0
*/
var fromNullable = function (e) {
return function (a) {
return a == null ? (0, exports.left)(e) : (0, exports.right)(a);
};
};
exports.fromNullable = fromNullable;
/**
* Constructs a new `Either` from a function that might throw.
*
* See also [`tryCatchK`](#trycatchk).
*
* @example
* import * as E from 'fp-ts/Either'
*
* const unsafeHead = <A>(as: ReadonlyArray<A>): A => {
* if (as.length > 0) {
* return as[0]
* } else {
* throw new Error('empty array')
* }
* }
*
* const head = <A>(as: ReadonlyArray<A>): E.Either<Error, A> =>
* E.tryCatch(() => unsafeHead(as), e => (e instanceof Error ? e : new Error('unknown error')))
*
* assert.deepStrictEqual(head([]), E.left(new Error('empty array')))
* assert.deepStrictEqual(head([1, 2, 3]), E.right(1))
*
* @category interop
* @since 2.0.0
*/
var tryCatch = function (f, onThrow) {
try {
return (0, exports.right)(f());
}
catch (e) {
return (0, exports.left)(onThrow(e));
}
};
exports.tryCatch = tryCatch;
/**
* Converts a function that may throw to one returning a `Either`.
*
* @category interop
* @since 2.10.0
*/
var tryCatchK = function (f, onThrow) {
return function () {
var a = [];
for (var _i = 0; _i < arguments.length; _i++) {
a[_i] = arguments[_i];
}
return (0, exports.tryCatch)(function () { return f.apply(void 0, a); }, onThrow);
};
};
exports.tryCatchK = tryCatchK;
/**
* Use `liftNullable`.
*
* @category legacy
* @since 2.9.0
*/
var fromNullableK = function (e) {
var from = (0, exports.fromNullable)(e);
return function (f) { return (0, function_1.flow)(f, from); };
};
exports.fromNullableK = fromNullableK;
/**
* Use `flatMapNullable`.
*
* @category legacy
* @since 2.9.0
*/
var chainNullableK = function (e) {
var from = (0, exports.fromNullableK)(e);
return function (f) { return (0, exports.flatMap)(from(f)); };
};
exports.chainNullableK = chainNullableK;
/**
* @category conversions
* @since 2.10.0
*/
exports.toUnion = (0, exports.foldW)(function_1.identity, function_1.identity);
// -------------------------------------------------------------------------------------
// utils
// -------------------------------------------------------------------------------------
/**
* Default value for the `onError` argument of `tryCatch`
*
* @since 2.0.0
*/
function toError(e) {
try {
return e instanceof Error ? e : new Error(String(e));
}
catch (error) {
return new Error();
}
}
function elem(E) {
return function (a, ma) {
if (ma === undefined) {
var elemE_1 = elem(E);
return function (ma) { return elemE_1(a, ma); };
}
return (0, exports.isLeft)(ma) ? false : E.equals(a, ma.right);
};
}
/**
* Returns `false` if `Left` or returns the result of the application of the given predicate to the `Right` value.
*
* @example
* import { exists, left, right } from 'fp-ts/Either'
*
* const gt2 = exists((n: number) => n > 2)
*
* assert.strictEqual(gt2(left('a')), false)
* assert.strictEqual(gt2(right(1)), false)
* assert.strictEqual(gt2(right(3)), true)
*
* @since 2.0.0
*/
var exists = function (predicate) {
return function (ma) {
return (0, exports.isLeft)(ma) ? false : predicate(ma.right);
};
};
exports.exists = exists;
// -------------------------------------------------------------------------------------
// do notation
// -------------------------------------------------------------------------------------
/**
* @category do notation
* @since 2.9.0
*/
exports.Do = (0, exports.of)(_.emptyRecord);
/**
* @category do notation
* @since 2.8.0
*/
exports.bindTo = (0, Functor_1.bindTo)(exports.Functor);
var let_ = /*#__PURE__*/ (0, Functor_1.let)(exports.Functor);
exports.let = let_;
/**
* @category do notation
* @since 2.8.0
*/
exports.bind = chainable.bind(exports.Chain);
/**
* The `W` suffix (short for **W**idening) means that the error types will be merged.
*
* @category do notation
* @since 2.8.0
*/
exports.bindW = exports.bind;
/**
* @category do notation
* @since 2.8.0
*/
exports.apS = (0, Apply_1.apS)(exports.Apply);
/**
* Less strict version of [`apS`](#aps).
*
* The `W` suffix (short for **W**idening) means that the error types will be merged.
*
* @category do notation
* @since 2.8.0
*/
exports.apSW = exports.apS;
/**
* @since 2.11.0
*/
exports.ApT = (0, exports.of)(_.emptyReadonlyArray);
// -------------------------------------------------------------------------------------
// array utils
// -------------------------------------------------------------------------------------
/**
* Equivalent to `ReadonlyNonEmptyArray#traverseWithIndex(Applicative)`.
*
* @category traversing
* @since 2.11.0
*/
var traverseReadonlyNonEmptyArrayWithIndex = function (f) {
return function (as) {
var e = f(0, _.head(as));
if ((0, exports.isLeft)(e)) {
return e;
}
var out = [e.right];
for (var i = 1; i < as.length; i++) {
var e_1 = f(i, as[i]);
if ((0, exports.isLeft)(e_1)) {
return e_1;
}
out.push(e_1.right);
}
return (0, exports.right)(out);
};
};
exports.traverseReadonlyNonEmptyArrayWithIndex = traverseReadonlyNonEmptyArrayWithIndex;
/**
* Equivalent to `ReadonlyArray#traverseWithIndex(Applicative)`.
*
* @category traversing
* @since 2.11.0
*/
var traverseReadonlyArrayWithIndex = function (f) {
var g = (0, exports.traverseReadonlyNonEmptyArrayWithIndex)(f);
return function (as) { return (_.isNonEmpty(as) ? g(as) : exports.ApT); };
};
exports.traverseReadonlyArrayWithIndex = traverseReadonlyArrayWithIndex;
/**
* Equivalent to `ReadonlyArray#traverseWithIndex(Applicative)`.
*
* @category traversing
* @since 2.9.0
*/
exports.traverseArrayWithIndex = exports.traverseReadonlyArrayWithIndex;
/**
* Equivalent to `ReadonlyArray#traverse(Applicative)`.
*
* @category traversing
* @since 2.9.0
*/
var traverseArray = function (f) { return (0, exports.traverseReadonlyArrayWithIndex)(function (_, a) { return f(a); }); };
exports.traverseArray = traverseArray;
/**
* Equivalent to `ReadonlyArray#sequence(Applicative)`.
*
* @category traversing
* @since 2.9.0
*/
exports.sequenceArray =
/*#__PURE__*/ (0, exports.traverseArray)(function_1.identity);
// -------------------------------------------------------------------------------------
// legacy
// -------------------------------------------------------------------------------------
/**
* Alias of `flatMap`.
*
* @category legacy
* @since 2.6.0
*/
exports.chainW = exports.flatMap;
/**
* Alias of `flatMap`.
*
* @category legacy
* @since 2.0.0
*/
exports.chain = exports.flatMap;
/**
* Alias of `tap`.
*
* @category legacy
* @since 2.0.0
*/
exports.chainFirst = exports.tap;
/**
* Alias of `tap`.
*
* @category legacy
* @since 2.8.0
*/
exports.chainFirstW = exports.tap;
/**
* Use [`parse`](./Json.ts.html#parse) instead.
*
* @category zone of death
* @since 2.0.0
* @deprecated
*/
function parseJSON(s, onError) {
return (0, exports.tryCatch)(function () { return JSON.parse(s); }, onError);
}
/**
* Use [`stringify`](./Json.ts.html#stringify) instead.
*
* @category zone of death
* @since 2.0.0
* @deprecated
*/
var stringifyJSON = function (u, onError) {
return (0, exports.tryCatch)(function () {
var s = JSON.stringify(u);
if (typeof s !== 'string') {
throw new Error('Converting unsupported structure to JSON');
}
return s;
}, onError);
};
exports.stringifyJSON = stringifyJSON;
/**
* This instance is deprecated, use small, specific instances instead.
* For example if a function needs a `Functor` instance, pass `E.Functor` instead of `E.either`
* (where `E` is from `import E from 'fp-ts/Either'`)
*
* @category zone of death
* @since 2.0.0
* @deprecated
*/
exports.either = {
URI: exports.URI,
map: _map,
of: exports.of,
ap: _ap,
chain: exports.flatMap,
reduce: _reduce,
foldMap: _foldMap,
reduceRight: _reduceRight,
traverse: _traverse,
sequence: exports.sequence,
bimap: _bimap,
mapLeft: _mapLeft,
alt: _alt,
extend: _extend,
chainRec: _chainRec,
throwError: exports.throwError
};
/**
* Use [`getApplySemigroup`](./Apply.ts.html#getapplysemigroup) instead.
*
* Semigroup returning the left-most `Left` value. If both operands are `Right`s then the inner values
* are concatenated using the provided `Semigroup`
*
* @category zone of death
* @since 2.0.0
* @deprecated
*/
exports.getApplySemigroup =
/*#__PURE__*/ (0, Apply_1.getApplySemigroup)(exports.Apply);
/**
* Use [`getApplicativeMonoid`](./Applicative.ts.html#getapplicativemonoid) instead.
*
* @category zone of death
* @since 2.0.0
* @deprecated
*/
exports.getApplyMonoid =
/*#__PURE__*/ (0, Applicative_1.getApplicativeMonoid)(exports.Applicative);
/**
* Use [`getApplySemigroup`](./Apply.ts.html#getapplysemigroup) instead.
*
* @category zone of death
* @since 2.0.0
* @deprecated
*/
var getValidationSemigroup = function (SE, SA) {
return (0, Apply_1.getApplySemigroup)((0, exports.getApplicativeValidation)(SE))(SA);
};
exports.getValidationSemigroup = getValidationSemigroup;
/**
* Use [`getApplicativeMonoid`](./Applicative.ts.html#getapplicativemonoid) instead.
*
* @category zone of death
* @since 2.0.0
* @deprecated
*/
var getValidationMonoid = function (SE, MA) {
return (0, Applicative_1.getApplicativeMonoid)((0, exports.getApplicativeValidation)(SE))(MA);
};
exports.getValidationMonoid = getValidationMonoid;
/**
* Use [`getApplicativeValidation`](#getapplicativevalidation) and [`getAltValidation`](#getaltvalidation) instead.
*
* @category zone of death
* @since 2.0.0
* @deprecated
*/
function getValidation(SE) {
var ap = (0, exports.getApplicativeValidation)(SE).ap;
var alt = (0, exports.getAltValidation)(SE).alt;
return {
URI: exports.URI,
_E: undefined,
map: _map,
of: exports.of,
chain: exports.flatMap,
bimap: _bimap,
mapLeft: _mapLeft,
reduce: _reduce,
foldMap: _foldMap,
reduceRight: _reduceRight,
extend: _extend,
traverse: _traverse,
sequence: exports.sequence,
chainRec: _chainRec,
throwError: exports.throwError,
ap: ap,
alt: alt
};
}
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