In "A&P," the theme of coming of age is central to the story. Sammy, a teenage cashier, experiences a pivotal moment that marks his transition from adolescence to adulthood. The narrative captures Sammy's impulsive decision to quit his job in defense of three girls who are reprimanded for their attire. This act, though seemingly trivial, signifies a deeper personal growth and a step towards independence.

The conflict between Sammy and his supervisor, Lengel, highlights the coming of age theme. When Lengel confronts the girls for their inappropriate dress, Sammy's decision to quit becomes a symbolic gesture of rebellion. Despite the triviality of the situation, Sammy's choice reflects his desire to break free from societal norms and align himself with a more liberated world. This moment is crucial for Sammy as it helps him define his own identity.

Sammy's actions are driven by a mix of youthful bravado and a desire to impress the girls, particularly "Queenie." His decision to stand up to Lengel and quit his job is an impulsive act of defiance. However, this decision also marks a painful entry into adulthood. Sammy expects admiration from the girls but finds himself alone, realizing the complexities of adult life and the consequences of his actions.

Updike uses various literary elements to portray Sammy's coming of age. Dialogue reveals the personalities of the characters and underscores Sammy's internal conflict. The irony in Sammy's actions—quitting his job to impress the girls who are no longer present—emphasizes his naivety. Additionally, the setting in a beach town supermarket adds a satirical layer, questioning societal norms and expectations.

"We want you decently dressed when you come in here."

Sammy's evolution from a bored teenager to someone who takes a stand against authority is a classic coming of age journey. His impulsive decision, though misguided, is a significant step in his personal growth, marking his transition into the complexities of adult life.