types are the only way to explicitly specify the return type of a lambda expression. In some cases the compiler is able to deduce a lambda’s return type, but not in all cases. Even when the compiler can Braced_Initializer_List_Format for formatting. Lambda expressions Use lambda expressions where appropriate. Prefer explicit captures when the lambda will escape the current scope. Lambda expressions are a concise way &sum](int x) { sum += weight * x; }); Default captures implicitly capture any variable referenced in the lambda body, including this if any members are used: 44 const std::vector lookup_table = ...; std::vector

Nested/Local/Inner Classes and Functions List Comprehensions Default Iterators and Operators Generators Lambda Functions Conditional Expressions Default Argument Values Properties True/False evaluations Deprecated and efficient way to create lists and iterators without resorting to the use of map(), filter(), or lambda. Pros: Simple list comprehensions can be clearer and simpler than other list creation techniques Decision: Fine. Use “Yields:” rather than “Returns:” in the doc string for generator functions. Lambda Functions link￿ Okay for one-liners. Definition: Lambdas define anonymous functions in an expression

(FooException | BarException e) • the colon (:) in an enhanced for (“foreach”) statement • the arrow in a lambda expression: (String str) -> str.length() but not • the two colons (::) of a method reference, which