Transform Objects and Arrays to String with breaks.

object-array-to-br-string.js

/**
 * Transform an array of messages from laravel error message bag to be a single html string with breaks
 * @param {Object | Array | String} message
 * @example
 * message = { username: ['some error', 'maybe another error'], email: ['another error', 'and another error']}
 * message = { username: 'some error', email: 'and another error'}
 * message = ['some error', 'and another error']
 * message = [['some error'], ['and another error']]
 * message = 'some error'
 * @return { String }
 */
export default function transformMessage (message) {
    let newMessage = message
    // Check if messages are an Object of array items
    if (typeof message === 'object') {
      newMessage = []
      Object.keys(message).forEach((key) => {
        // We flatten the message if its an obj or just pass it if is a string.
       if(typeof message[key] === 'object'){
          newMessage.push(...message[key])
       } else {
          newMessage.push(message[key])
       }
      })
      newMessage = newMessage.join(' <br />')
    } 
  // its not an object so we just return it.
  return newMessage
}