/**
 * Flattens an array.
 * @function
 * @param {array} nested - A arbitrarily nested array.
 * @returns {array} flat - The resulting flattened array.
 */

export const flatten = nested => {
  let flat = []
  nested.forEach(v => {
    flat = v instanceof Array ? [...flat, flatten(v, flat)] : [...flat, v]
  })
  return flat
}