findDeep.js

export const findDeep = (data, pathArr, fallback) => {
  const len = pathArr.length
  for (let i = 0; i < len; i++) {
    let path = pathArr[i]
    if (
      Array.isArray(data[path]) ||
      findDeep.isObject(data[path]) ||
      typeof data[path] === 'string'
    ) {
      if (i === len - 1) {
        return data[path]
      }
      data = data[path]
    } else {
      return fallback
    }
  }
}

findDeep.isObject = obj => obj && typeof obj === 'object'

/* Ex.
var secondQuery = findDeep(
  result,
  [
    "GoodreadsResponse",
    "search",
    0,
    "results",
    0,
    "work",
    0,
    "best_book",
    0,
    "title",
    0,
  ],
  false
);
*/