The way hamlet changes over the course of the play is called

  Character development.

Explanation:

  The character development is a literary device used to evolve the character through the story.

  Hamlet is an enigmatic character that begins the story as a grieving son who had recently lost his father, the King. When a ghost appeared in front of him he began to question about the veracity of the story around his father´s death. He got obsessed to prove his uncle´s guilt. And finally, he seeks to revenge his father´s murder by killing his uncle.

  I hope this answer helps you.

character developement

Explanation:

When Mr. Pirzada came to dine is not only a story about a man living away from his family in a foreign country but it is also about a child's understanding of what it means to miss someone dear.