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Просмотр файла: IO.js
"use strict";
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var __importStar = (this && this.__importStar) || function (mod) {
if (mod && mod.__esModule) return mod;
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__setModuleDefault(result, mod);
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};
Object.defineProperty(exports, "__esModule", { value: true });
exports.getMonoid = exports.getSemigroup = exports.io = exports.chainFirst = exports.chain = exports.sequenceArray = exports.traverseArray = exports.traverseArrayWithIndex = exports.traverseReadonlyArrayWithIndex = exports.traverseReadonlyNonEmptyArrayWithIndex = exports.ApT = exports.apS = exports.bind = exports.let = exports.bindTo = exports.Do = exports.FromIO = exports.ChainRec = exports.MonadIO = exports.fromIO = exports.tap = exports.Monad = exports.Chain = exports.Applicative = exports.apSecond = exports.apFirst = exports.Apply = exports.Pointed = exports.flap = exports.asUnit = exports.as = exports.Functor = exports.URI = exports.flatten = exports.flatMap = exports.of = exports.ap = exports.map = void 0;
/**
* ```ts
* interface IO<A> {
* (): A
* }
* ```
*
* `IO<A>` represents a non-deterministic synchronous computation that can cause side effects, yields a value of
* type `A` and **never fails**.
*
* If you want to represent a synchronous computation that may fail, please see `IOEither`.
* If you want to represent a synchronous computation that may yield nothing, please see `IOOption`.
*
* @since 2.0.0
*/
var Applicative_1 = require("./Applicative");
var Apply_1 = require("./Apply");
var chainable = __importStar(require("./Chain"));
var function_1 = require("./function");
var Functor_1 = require("./Functor");
var _ = __importStar(require("./internal"));
var _map = function (ma, f) { return function () { return f(ma()); }; };
var _ap = function (mab, ma) { return function () { return mab()(ma()); }; };
var _chainRec = function (a, f) { return function () {
var e = f(a)();
while (e._tag === 'Left') {
e = f(e.left)();
}
return e.right;
}; };
/**
* `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 2.0.0
*/
var map = function (f) { return function (fa) { return _map(fa, f); }; };
exports.map = map;
/**
* @since 2.0.0
*/
var ap = function (fa) { return function (fab) { return _ap(fab, fa); }; };
exports.ap = ap;
/**
* @category constructors
* @since 2.0.0
*/
exports.of = function_1.constant;
/**
* @category sequencing
* @since 2.14.0
*/
exports.flatMap = (0, function_1.dual)(2, function (ma, f) {
return function () {
return f(ma())();
};
});
/**
* @category sequencing
* @since 2.0.0
*/
exports.flatten = (0, exports.flatMap)(function_1.identity);
/**
* @category type lambdas
* @since 2.0.0
*/
exports.URI = 'IO';
/**
* @category instances
* @since 2.7.0
*/
exports.Functor = {
URI: exports.URI,
map: _map
};
/**
* Maps the value 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 value to the void constant value.
*
* @category mapping
* @since 2.16.0
*/
exports.asUnit = (0, Functor_1.asUnit)(exports.Functor);
/**
* @category mapping
* @since 2.10.0
*/
exports.flap = (0, Functor_1.flap)(exports.Functor);
/**
* @category instances
* @since 2.10.0
*/
exports.Pointed = {
URI: exports.URI,
of: exports.of
};
/**
* @category instances
* @since 2.10.0
*/
exports.Apply = {
URI: exports.URI,
map: _map,
ap: _ap
};
/**
* Combine two effectful actions, keeping only the result of the first.
*
* @since 2.0.0
*/
exports.apFirst = (0, Apply_1.apFirst)(exports.Apply);
/**
* Combine two effectful actions, keeping only the result of the second.
*
* @since 2.0.0
*/
exports.apSecond = (0, Apply_1.apSecond)(exports.Apply);
/**
* @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
};
/**
* 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));
/**
* @category zone of death
* @since 2.7.0
* @deprecated
*/
exports.fromIO = function_1.identity;
/**
* @category instances
* @since 2.7.0
*/
exports.MonadIO = {
URI: exports.URI,
map: _map,
ap: _ap,
of: exports.of,
chain: exports.flatMap,
fromIO: exports.fromIO
};
/**
* @category instances
* @since 2.7.0
*/
exports.ChainRec = {
URI: exports.URI,
map: _map,
ap: _ap,
chain: exports.flatMap,
chainRec: _chainRec
};
/**
* @category instances
* @since 2.10.0
*/
exports.FromIO = {
URI: exports.URI,
fromIO: function_1.identity
};
// -------------------------------------------------------------------------------------
// 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);
/**
* @category do notation
* @since 2.8.0
*/
exports.apS = (0, Apply_1.apS)(exports.Apply);
/**
* @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) {
return function () {
var out = [f(0, _.head(as))()];
for (var i = 1; i < as.length; i++) {
out.push(f(i, as[i])());
}
return 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 2.0.0
*/
exports.chain = exports.flatMap;
/**
* Alias of `tap`.
*
* @category legacy
* @since 2.0.0
*/
exports.chainFirst = exports.tap;
// -------------------------------------------------------------------------------------
// deprecated
// -------------------------------------------------------------------------------------
/**
* This instance is deprecated, use small, specific instances instead.
* For example if a function needs a `Functor` instance, pass `IO.Functor` instead of `IO.io`
* (where `IO` is from `import IO from 'fp-ts/IO'`)
*
* @category zone of death
* @since 2.0.0
* @deprecated
*/
exports.io = {
URI: exports.URI,
map: _map,
of: exports.of,
ap: _ap,
chain: exports.flatMap,
fromIO: exports.fromIO,
chainRec: _chainRec
};
/**
* Use [`getApplySemigroup`](./Apply.ts.html#getapplysemigroup) instead.
*
* @category zone of death
* @since 2.0.0
* @deprecated
*/
exports.getSemigroup = (0, Apply_1.getApplySemigroup)(exports.Apply);
/**
* Use [`getApplicativeMonoid`](./Applicative.ts.html#getapplicativemonoid) instead.
*
* @category zone of death
* @since 2.0.0
* @deprecated
*/
exports.getMonoid = (0, Applicative_1.getApplicativeMonoid)(exports.Applicative);
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