Javascript rtrim, ltrim, trim helpers

util-strings.js

export const ltrim = (str, char) => {
  let message = str;
  if (typeof message !== 'undefined') {
    while (message[0] === char) {
      message = message.substring(1);
    }
  }

  return message;
};

export const rtrim = (str, char) => {
  let message = str;
  if (typeof message !== 'undefined') {
    while (message[message.length - 1] === char) {
      message = message.substring(0, message.length - 1);
    }
  }

  return message;
};

export const trim = (str, char) => {
  return ltrim(rtrim(str, char), char);
};