Как сделать перенос строки по заданной позиции в строке

var str="You can communicate not only with friends, but also get acquainted with the mass of new interesting people."; 
 
var carry_option = {character_number: 4, carry_character: '<br>'} 
 
for (var i = 0, n = 1; i < str.length; i++, n++){ 
  document.write(str[i]); 
   
  // Если n = нашему числу, то переносим и обнуляем 
  if( n == carry_option.character_number ){ 
    document.write( carry_option.carry_character ); 
    n = 0; 
  }; 
};

var str="You can communicate not only with friends, but also get acquainted with the mass of new interesting people."; 
 
var n = 8; 
var r = new RegExp('.{1,'+n+'}', 'g') 
var chunks = str.match(r) 
 
//chunks.forEach(chunk => document.write(chunk+'<br />')); 
document.write(chunks.join('<br />'))

var str="You can communicate not only with friends, but also get acquainted with the mass of new interesting people."; 
var n = 8; 
for (var i = 0; i < str.length; i++) { 
  document.write(str[i]); 
  if ((i+1)%n == 0) document.write('<br/>'); 
}