I think everything works now

random.js

@@ -39,7 +39,7 @@ const breakDown = (node)=>{
 	return node;
 }
 
-const tree = breakDown({value:9});
+const tree = breakDown({value:10});
 
 //console.dir(tree, {depth:null});
 
@@ -76,8 +76,9 @@ const getLeaves = (node)=>{
 			if(Number.isInteger(threePathRightValue[0])){
 				threePathRightValue.unshift(threePathLeftValue);
 			} else {
-				threePathRightValue[0].unshift(threePathLeftValue)
-				threePathRightValue[1].unshift(threePathLeftValue);
+				for(let subArray of threePathRightValue){
+					subArray.unshift(threePathLeftValue);
+				}
 			}
 			threePathResult = threePathRightValue;
 		}