The Complete Rust Programming Reference Guide

Blocks and expressions

Despite being a mix of statements and expressions, Rust is primarily an expression-oriented language. This means that most constructs are expressions that return a value. It's also a language that uses C-like braces {}, to introduce new scope for variables in a program. Let's get these concepts straight before we talk more about them later in this chapter.

A block expression (hereby referred as blocks) is any item that starts with { and ends with }. In Rust, they include if else expressions, match expressions, while loops, loops, bare {} blocks, functions, methods, and closures, and all of them return a value which is the last line of the expression. If you put a semicolon in the last expression, the block expressions ...