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Просмотр файла: Alternative.js
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.altAll = altAll;
exports.getAlternativeMonoid = getAlternativeMonoid;
/**
* The `Alternative` type class extends the `Alt` type class with a value that should be the left and right identity for `alt`.
*
* It is similar to `Monoid`, except that it applies to types of kind `* -> *`, like `Array` or `Option`, rather than
* concrete types like `string` or `number`.
*
* `Alternative` instances should satisfy the following laws:
*
* 1. Left identity: `A.alt(zero, fa) <-> fa`
* 2. Right identity: `A.alt(fa, zero) <-> fa`
* 3. Annihilation: `A.map(zero, f) <-> zero`
* 4. Distributivity: `A.ap(A.alt(fab, gab), fa) <-> A.alt(A.ap(fab, fa), A.ap(gab, fa))`
* 5. Annihilation: `A.ap(zero, fa) <-> zero`
*
* @since 2.0.0
*/
var Alt_1 = require("./Alt");
var Apply_1 = require("./Apply");
function altAll(F) {
return (0, Alt_1.altAll)(F)(F.zero());
}
function getAlternativeMonoid(F) {
var f = (0, Apply_1.getApplySemigroup)(F);
return function (S) {
var SF = f(S);
return {
concat: function (first, second) {
return F.alt(SF.concat(first, second), function () { return F.alt(first, function () { return second; }); });
},
empty: F.zero()
};
};
}
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