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There is one quite serious consequence when using lambda expressions that may affect performance. When you declare a lambda expression, you are creating a closure over the local scope. What does this mean and how does it affect performance? Well I'm glad you asked. It means that each of those little lambda expressions is a small anonymous inner class and ...


Many languages don't have statements, only expressions. Ruby, for example, doesn't have statements, but it does have blocks: begin some_expression some_other_expression a_third_expression end Since Ruby doesn't have statements, which means everything is an expression, which means everything has a value, obviously blocks are expressions and have ...


It depends upon the programming languages. Some also use (or want) declarations. Functional languages like Scheme, Ocaml, Haskell don't have statements (only expressions). Read Scott's book on Programming Language Pragmatics.


In addition to statements and expressions, there are type declarations, functions/methods, syntactic trivia (white space and comments) and metadata for example.


No. A program's text can contain "comment" or "documentation" blocks as well, and certain languages might have "data structure" blocks, like baked-in XML or JSON.


In many scene, I think lambda and method-reference is equivalent. But the lambda will wrap the invocation target by the declaring interface type. For example public class InvokeTest { private static void invoke(final Runnable r) { r.run(); } private static void target() { new Exception().printStackTrace(); } @Test ...

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