Tree Equal ?

Python

def tree_equal(node1, node2):
    if not node1 and not node2:
        return True
    if not node1 or not node2:
        return False
    return node1.val == node2.val and \
        tree_equal(node1.left, node2.left) and \
        tree_equal(node1.right, node2.right)

JavaScript

function treeEqual(node1, node2) {
    if (!node1 && !node2) {
        return true;
    }
    if (!node1 || !node2) {
        return false;
    }
    return node1.val == node2.val &&
        treeEqual(node1.left, node2.left) &&
        treeEqual(node1.right, node2.right);
}