@instructure/quiz-interactions/src/util/focusHelpers.js

A React UI component Library for quiz interaction types.

import findIndex from 'lodash/findIndex'
import isString from 'lodash/isString'

export function getNextItemIdFromArray(itemId, items) {
  if (items.length > 1) {
    // the array can have objects or strings
    const indexCurrentItem = findIndex(items, item => item.id === itemId || item === itemId)
    // get previous item if exists, else the next item
    const nextItem = items[indexCurrentItem - 1] || items[indexCurrentItem + 1]

    if (nextItem.id) {
      // if nextItem is an object with an id
      return nextItem.id
    }
    if (isString(nextItem)) {
      // if nextItem a sting
      return nextItem
    }
  }
}