This function takes a string and limits it from the bottom based on the output length.

trim_strings.js

/**
 * This function takes a string and limits it from the bottom based on the output length. 
 * 
 * The following strings are invalid as answers "Codility we test code": This is because we need to return coders instead.
 * The string output should not be less than the output length as well.
 * The string can return an empty string as an answer too,
 * 
 * @param {string} message 
 * @param {number} outputLength 
 * @returns {string}
 */
function trimString(message = "Codility We test coders", outputLength) {
  let messageArray = message.split(" ");
  let strippedMessage = message.substring(0, outputLength);
  let strippedMessageArray = strippedMessage.split(" ");

  /* Compare each words match */
  let newMessage = strippedMessageArray.map((el) => {
    if (messageArray.includes(el)) {
      return el;
    }
    
    return null;
  }).filter((el) => el != null);
  
  newMessage = newMessage.join(" ");

  console.log(newMessage);
  return newMessage;
}

trimString("Codility We test coders", 14);
trimString("The quick brown fox jumps over the lazy dog", 21);