redux-ab-test/dist/utils/select-variation.js

A/B testing React components with Redux and debug tools. Isomorphic with a simple, universal interface. Well documented and lightweight. Tested in popular browsers and Node.js. Includes helpers for React, Redux, and Segment.io

'use strict';

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

var _stringify = require('babel-runtime/core-js/json/stringify');

var _stringify2 = _interopRequireDefault(_stringify);

exports['default'] = selectVariation;

var _immutable = require('immutable');

var _immutable2 = _interopRequireDefault(_immutable);

var _randomVariation = require('./random-variation');

var _randomVariation2 = _interopRequireDefault(_randomVariation);

var _createCacheStore = require('./create-cache-store');

var _createCacheStore2 = _interopRequireDefault(_createCacheStore);

var _getKey = require('./get-key');

var _getKey2 = _interopRequireDefault(_getKey);

var _logger = require('./logger');

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { 'default': obj }; }

/**
 * Select a variation for the experiment
 */
function selectVariation(props) {
  var active = props.active,
      experiment = props.experiment,
      defaultVariationName = props.defaultVariationName,
      cacheStore = props.cacheStore;

  var cache = cacheStore === undefined || cacheStore === null ? (0, _createCacheStore2['default'])() : cacheStore;

  var experimentKey = (0, _getKey2['default'])(experiment);
  (0, _logger.logger)(__filename + ' selectVariation experiment.name=\'' + experiment.get('name') + '\', experimentKey=\'' + experimentKey + '\'');

  // Hash of variation.name => VariationType
  var variationsMap = experiment.get('variations').reduce(function (hash, variation) {
    hash[(0, _getKey2['default'])(variation)] = variation;
    return hash;
  }, {});

  // Match against the redux state
  var variationKey = active.get(experimentKey);
  if (variationKey && variationsMap[variationKey]) {
    (0, _logger.logger)(__filename + ' selectVariation experiment.name=\'' + experiment.get('name') + '\', variationKey=\'' + variationKey + '\'');
    (0, _logger.logger)(__filename + ' selectVariation experiment.name=\'' + experiment.get('name') + '\', variationsMap[variationKey]=\'' + (0, _stringify2['default'])(variationsMap[variationKey]) + '\'');
    return variationsMap[variationKey];
  }

  // Match against the instance state.
  // This is used as a in-memory cache to prevent multiple instances of the same experiment from getting differient variations.
  // It is wiped out with each pass of the RESET/LOAD/PLAY cycle
  variationKey = cache.getItem(experimentKey);
  if (variationKey && variationsMap[variationKey]) {
    (0, _logger.logger)(__filename + ' selectVariation experiment.name=\'' + experiment.get('name') + '\', variationKey=\'' + variationKey + '\'');
    (0, _logger.logger)(__filename + ' selectVariation experiment.name=\'' + experiment.get('name') + '\', variationsMap[variationKey]=\'' + (0, _stringify2['default'])(variationsMap[variationKey]) + '\'');
    return variationsMap[variationKey];
  }

  // Match against the defaultVariationName
  variationKey = defaultVariationName;
  if (variationKey && variationsMap[variationKey]) {
    (0, _logger.logger)(__filename + ' selectVariation experiment.name=\'' + experiment.get('name') + '\', variationKey=\'' + variationKey + '\'');
    (0, _logger.logger)(__filename + ' selectVariation experiment.name=\'' + experiment.get('name') + '\', variationsMap[variationKey]=\'' + (0, _stringify2['default'])(variationsMap[variationKey]) + '\'');
    cache.setItem(experimentKey, variationKey);
    return variationsMap[variationKey];
  }

  // Pick a variation ramdomly
  var variation = (0, _randomVariation2['default'])(experiment);

  // Record the choice in the tmp cache
  variationKey = (0, _getKey2['default'])(variation);
  cache.setItem(experimentKey, variationKey);

  (0, _logger.logger)(__filename + ' selectVariation experiment.name=\'' + experiment.get('name') + '\', variationKey=\'' + variationKey + '\'');
  (0, _logger.logger)(__filename + ' selectVariation experiment.name=\'' + experiment.get('name') + '\', variation.name=\'' + (variation && variation.get('name')) + '\'');

  // Return the chosen variation
  return variation;
}
module.exports = exports['default'];