higher-order-reducers/lib/compose.js

A library of simple everyday reducer utility functions

'use strict';

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

  if (!Array.isArray(reducers)) {
    throw new Error('"reducers" must be an array');
  }
  for (var i = 0; i < reducers.length; i += 1) {
    if (typeof reducers[i] !== 'function') {
      throw new Error('Element at position ' + i + ' in "compose" is not a reducer');
    }
  }

  return function (state, action) {
    return reducers.reduce(function (currentState, currentReducer) {
      return currentReducer(currentState, action);
    }, state);
  };
};

exports.default = compose;