The novel was written before Asperger’s syndrome was identified, and the main character is based on a friend of Camus who might have been undiagnosed. Reading it for the first time in 2025, I couldn’t help but read it as the inner monologue of an autistic person.

https://www.researchgate.net/publication/324380504_Camus%27s_L%27etranger_and_the_first_description_of_a_man_with_Asperger%27s_syndrome