Takes a value and turns it into an array if it isn't already.

parseArray.js

/**
 * Takes a value and turns it into an array if it isn't already.
 * @param {*} value
 *   The value that should be turned into an array.  If this is already an
 *   array just return it.  If this is a non-iterable value or is a string
 *   literal the returned value will be an array containing this value.
 *   Otherwise if this is iterable it will be returned as a new array.
 * @returns {any[]}
 *   If `value` is already an array it will be returned, otherwise return a
 *   new array representing `value`.
 */
function parseArray(value) {
  if (Array.isArray(value)) return value;
  // Checking if value is iterable but not a string.
  // NOTE:  checking against null and undefined because `document.all == null`
  // is true but not when using strict equality.
  if (value !== null && value !== undefined && 'string' !== typeof value && 'function' === typeof value[Symbol.iterator]) {
    try {
      return [...value];
    }catch(e){}
  }
  return [value];
}