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

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'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.foldMap = foldMap;

var _HKT = require('./HKT');

/* A default implementation of `foldMap` using `foldl`. */


/*

  `Foldable` represents data structures which can be _folded_.

  - `foldr` folds a structure from the right (not implemented)
  - `foldl` folds a structure from the left
  - `foldMap` folds a structure by accumulating values in a `Monoid`

  reduce = foldl

*/

function foldMap(foldable, monoid, f, fa) {
  return foldable.reduce(function (acc, x) {
    return monoid.concat(f(x), acc);
  }, monoid.empty(), fa);
}