higher-order-reducers/lib/chain.js

A library of simple everyday reducer utility functions

'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});
var chain = function chain() {
  var reducers = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : [];

  for (var i = 0; i < reducers.length; i += 1) {
    if (typeof reducers[i] !== 'function') {
      throw new Error('Element at position ' + i + ' in "chain" is not a reducer');
    }
  }
  var getNext = function getNext(position, action) {
    return function (state) {
      if (position >= reducers.length) {
        return state;
      }
      return reducers[position](state, action, getNext(position + 1, action));
    };
  };

  return function (state, action) {
    return getNext(0, action)(state);
  };
};

exports.default = chain;