1+ 'use strict' ;
2+ class Node {
3+ constructor ( data ) {
4+ this . data = data ;
5+ this . leftNode = this . rightNode = null ;
6+ }
7+ }
8+ 9+ function printAllInternalNodes ( root ) {
10+ if ( root == null ) return ;
11+ if ( root . leftNode != null && root . rightNode != null ) console . log ( root . data ) ;
12+ printAllInternalNodes ( root . leftNode ) ;
13+ printAllInternalNodes ( root . rightNode ) ;
14+ }
15+ 16+ //level - 1
17+ let tree = new Node ( 1 ) ;
18+ 19+ // level - 2
20+ tree . leftNode = new Node ( 2 ) ;
21+ tree . rightNode = new Node ( 3 ) ;
22+ 23+ // level - 3
24+ tree . leftNode . leftNode = new Node ( 4 ) ;
25+ tree . leftNode . rightNode = new Node ( 5 ) ;
26+ 27+ tree . rightNode . leftNode = new Node ( 6 ) ;
28+ tree . rightNode . rightNode = new Node ( 7 ) ;
29+ 30+ // level - 4
31+ tree . leftNode . leftNode . leftNode = new Node ( 8 ) ;
32+ tree . leftNode . leftNode . rightNode = new Node ( 9 ) ;
33+ 34+ tree . leftNode . rightNode . leftNode = new Node ( 10 ) ;
35+ tree . leftNode . rightNode . rightNode = new Node ( 11 ) ;
36+ 37+ tree . rightNode . leftNode . leftNode = new Node ( 12 ) ;
38+ tree . rightNode . leftNode . rightNode = new Node ( 13 ) ;
39+ 40+ tree . rightNode . rightNode . leftNode = new Node ( 14 ) ;
41+ tree . rightNode . rightNode . rightNode = new Node ( 15 ) ;
42+ // 1
43+ // / \
44+ // 2 3
45+ // / \ / \
46+ // 4 5 6 7
47+ // / \ / \ / \ / \
48+ // 8 9 10 11 12 13 14 15
49+ printAllInternalNodes ( tree ) ;
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