@dillonkearns/elm-graphql/examples/src/subscription/node_modules/flow-static-land/lib/Monoid.js

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'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.arrayMonoid = exports.stringMonoid = exports.product = exports.sum = exports.any = exports.all = undefined;
exports.concatAll = concatAll;
exports.getProductMonoid = getProductMonoid;
exports.getDualMonoid = getDualMonoid;

var _Semigroup = require('./Semigroup');

// Fold a list using the monoid
function concatAll(monoid, as) {
  return as.reduce(monoid.concat, monoid.empty());
}

function getProductMonoid(amonoid, bmonoid) {
  return {
    empty: function empty() {
      return [amonoid.empty(), bmonoid.empty()];
    },
    concat: (0, _Semigroup.getProductSemigroup)(amonoid, bmonoid).concat
  };
}

function getDualMonoid(monoid) {
  return {
    empty: monoid.empty,
    concat: function concat(x, y) {
      return monoid.concat(y, x);
    }
  };
}

// Boolean monoid under conjunction
var all = exports.all = {
  empty: function empty() {
    return true;
  },
  concat: function concat(x, y) {
    return x && y;
  }
};

// Boolean monoid under disjunction
var any = exports.any = {
  empty: function empty() {
    return false;
  },
  concat: function concat(x, y) {
    return x || y;
  }
};

// Monoid under addition
var sum = exports.sum = {
  empty: function empty() {
    return 0;
  },
  concat: function concat(x, y) {
    return x + y;
  }
};

// Monoid under multiplication
var product = exports.product = {
  empty: function empty() {
    return 1;
  },
  concat: function concat(x, y) {
    return x * y;
  }
};

var stringMonoid = exports.stringMonoid = {
  empty: function empty() {
    return '';
  },
  concat: function concat(x, y) {
    return x + y;
  }
};

var arrayMonoid = exports.arrayMonoid = {
  empty: function empty() {
    return [];
  },
  concat: function concat(x, y) {
    return x.concat(y);
  }
};