Function skipPracticeLevels

app/core/utils.js:983–988

(levels, index)

}

const skipPracticeLevels = function (levels, index) {
  while ((index >= 0) && isPractice(levels[index])) {
    index--
  }
  return index
}

const findFirstIncompleteLevelOfPreviousPracticeChain = function (levels, currentIndex) {
  let index = skipNonPracticeLevels(levels, currentIndex - 1)