CSC301: Tree code: Nullable [47/56] Previous pageContentsNext page

    public int size () {
        return size (root);
    private static int size (Node x) {
        if (x == null) return 0;
        int sz = 1;
        sz += size (x.left);
        sz += size (x.right);
        return sz;

Back to the version with one variable.

Note that it does not matter when we add 1 to sz, since we don't carry the intermediate values around as parameters.

In this code, we make the call, then check for null.

The variable x is nullable (may be assigned null)

Lets call this the nullable version.

We might also call it optimistic, or Just do it!

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