In what situations are lambda expressions used in programming?

Lambda expressions are used in programming for concise descriptions of anonymous functions that can be passed as parameters, returned from functions, or stored in variables. Main use cases:

• Collection processing: for operations like map, filter, forEach, and others.
• Event handlers: for example, in GUI or Android for handling clicks.
• Deferred execution: passing code to be executed later (e.g., in threads or timers).
• Functional programming: simplifying code by passing functions as objects.

Example in Java:

List<String> names = Arrays.asList("Anna", "Bob", "Charlie");
names.stream()
     .filter(name -> name.startsWith("A"))
     .forEach(name -> System.out.println(name));

Here, lambda expressions allow for concise description of filtering logic and output.