CSC301: Tree code: Recursion going left [33/56]

    public int sizeLeft () {
        return sizeLeft (root, 0);
    }
    private static int sizeLeft (Node x, int sz) {
        if (x != null) {
            sz = sizeLeft (x.left, sz + 1);
        }
        return sz;
    }

Recursion going left

Here is a trace of an execution.