array-object-flattener/index.js

This is an array and object flattener.

function flattener(obj, keys = null, result = []) {
  for (let key in obj) {
    if (keys === null || keys === true) result.push(key);

    if (typeof obj[key] !== 'object') {
      if (keys === null || keys === false) result.push(obj[key]);
    } else {
      flattener(obj[key], keys, result);
    }
  }
  return result;
}

module.exports = flattener;