Peek
Domain: Data Structures
🎯 Motivation
Sometimes you need to see the top of a stack without removing it. Peek lets you look without modifying the stack.
📋 Concrete Example
stack = [1, 2, 3]; top = stack[-1] gives 3 without removing it. The stack stays [1, 2, 3].
🔗 Analogy
Looking at the top plate through the glass door of the cupboard without actually opening the door and taking it.