checkUnique.js

Table of Contents

  1. appStateFactory.js
  2. createAppDispatcher.js
  3. StateWithSideEffects.js
  4. createChannels.js
  5. createSagas.js
  6. sagaInterfaceFactory.js
  7. Container.js
  8. createContainer.js
  9. createDangerouslySlowContainer.js
  10. index.js
  11. ContainerHelpers.js
  12. assert.js
  13. cast.js
  14. checkUnique.js
  15. isObservable.js
  16. uuid.js
  17. ReduxSaga.js
  18. createReduxReducers.js
  19. reduxChannelName.js
  20. reduxMiddlewareFactory.js
  21. rfluxMessage.js
  22. kefirEmitter.js 
/**
 * Checks that the given prop occurs only once in the array of objects
 * @param {[]} arrayOfObjs
 * @param {string} prop
 * @param {string} msg
 * @private
 */
export default function checkUnique(arrayOfObjs = [], prop, msg) {
  const hist = {}

  for(let i in arrayOfObjs) {
    const item = arrayOfObjs[i]

    hist[item[prop]] = (hist[item[prop]] || 0) + 1
    if (hist[item[prop]] >= 2) {
      throw new Error(`${msg}: ${item[prop]}`)
    }
  }
}
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