src/main/java/org/organicdesign/fp/collections/PersistentTreeMap.java
@Override public PersistentTreeMap<K,V> without(K key) {
        Box<Node<K,V>> found = new Box<>(null);
        Node<K,V> t = remove(tree, key, found);
        if (t == null) {
            //null == doesn't contain key
            if (found.val == null) {
                return this;
            }
            //empty
            return new PersistentTreeMap<>(comp, null, 0);
        }
        return new PersistentTreeMap<>(comp, t.blacken(), size - 1);
    }
@Override public PersistentTreeMap<K,V> without(K key) {
        Box<Node<K,V>> found = new Box<>(null);
        Node<K,V> t = remove(tree, key, found);
        if (t == null) {
            //null == doesn't contain key
            if (found.val == null) {
                return this;
            }
            //empty
            return new PersistentTreeMap<>(comp, null, 0);
        }
        return new PersistentTreeMap<>(comp, t.blacken(), size - 1);
    }
@ Override public PersistentTreeMap < K , V > without ( K key ) { Box < Node < K , V > > found = new Box <> ( null ) ; Node < K , V > t = remove ( tree , key , found ) ; if ( t == null ) { //null == doesn't contain key if ( found . val == null ) { return this ; } //empty return new PersistentTreeMap <> ( comp , null , 0 ) ; } return new PersistentTreeMap <> ( comp , t . blacken ( ) , size - 1 ) ; }
{@inheritDoc}
{