break string into substring reccursive solution

breakwords.js

function breakWord(stringToBreak, dictionary) {
  if(dictionary.has(stringToBreak)) return stringToBreak;
  var length = stringToBreak.length;
  
  for (var i=1; i < length; i++) {
    var prefix = stringToBreak.substring(0, i);
    if(dictionary.has(prefix)) {
      var sufix = stringToBreak.substring(i, length);
      var segSufix = breakWord(sufix, dictionary);
        if(segSufix != null) {
          return prefix + ' ' + segSufix;
        }
    }
  }
  
  return null;
}





var mySet = new Set();

mySet.add("This");
mySet.add("is");
mySet.add("break");
mySet.add("through");
mySet.add("huge");
mySet.add("breakthrough");

var inputString = "hugebreakthrough";

var result = breakWord(inputString, mySet);

console.log(result);