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Текущая директория: /opt/BitGoJS/node_modules/fp-ts/es6

Просмотр файла: Alternative.js

/**
 * 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
 */
import { altAll as altAll_ } from './Alt';
import { getApplySemigroup } from './Apply';
export function altAll(F) {
    return altAll_(F)(F.zero());
}
export function getAlternativeMonoid(F) {
    var f = 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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