This novel presents a coming-of-age story, but with a twist. The usual pattern in this genre of fiction is for the protagonist to begin in turmoil, struggle toward maturity, face various obstacles that initially defeat him but that he can overcome through virtue and perseverance, and eventually triumph. That is not Holden's story, however. Holden begins in turmoil, struggles in turmoil, has a moment of epiphany watching Phoebe at the carrousel, and eventually suffers physical and emotional collapse.
Holden does evolve toward the end of the novel. His acceptance of Phoebe's need to "grab for the gold ring" indicates that he sees her as a maturing individual who must be allowed to live her own life and take her own risks. At this point, he finally sees that children have to do this, and adults must let them. That's a step forward from believing that he must be their protector. For better or worse, Holden's own maturation has begun. He seems ready to surrender to the inevitability of growing up. He is exhausted, physically and emotionally, ready to go home and collapse.
Holden may or may not have progressed enough, learned enough, matured enough at the sanitarium to make it in the future. We can cheer for him, but we can't know what will happen. Salinger does not spoon-feed the reader a "happy" ending, which is all the better for readers of the novel. As Holden says in the final chapter, "I mean how do you know what you're going to do till you do it?"
