code: function isCharInRange(char = '', start, end) {
    if (isEmpty(char)) return false;
    const code = char.charCodeAt(0);
    return start <= code && code <= end;
  }
docs: Takes a character and a unicode range. Returns true if the char is in the range.
  @param  {String}  char  unicode character
  @param  {Number}  start unicode start range
  @param  {Number}  end   unicode end range
  @return {Boolean}