no global leaves var

random.js

@@ -43,20 +43,21 @@ const tree = breakDown({value:5});
 
 console.dir(tree, {depth:null});
 
-const getLeaves = (node, leafArray)=>{
+const getLeaves = (node)=>{
 	if(node.twoPath === undefined){
 		return node.value;
 	}
-	const leftValue = getLeaves(node.twoPath.left, leafArray)
-	const rightValue = getLeaves(node.twoPath.right, leafArray)
-	leafArray.push([leftValue, rightValue]);
+	const twoLeftValue = getLeaves(node.twoPath.left);
+	const twoRightValue = getLeaves(node.twoPath.right);
+	
 	if(node.threePath !== undefined){
-		const leftValue = getLeaves(node.threePath.left, leafArray)
-		const rightValue = getLeaves(node.threePath.right, leafArray)
-		leafArray.push([leftValue, rightValue]);
+		const threeLeftValue = getLeaves(node.twoPath.left);
+		const threeRightValue = getLeaves(node.twoPath.right);
+		return [[twoLeftValue, twoRightValue], [threeLeftValue, threeRightValue]];
 	}
+
+	return [twoLeftValue, twoRightValue];
 }
-const leaves = []
-getLeaves(tree, leaves);
+const leaves = getLeaves(tree);
 
 console.log(leaves);