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Struct expressions

Struct expressions StructExpression -> PathInExpression `{` (StructExprFields | StructBase)? `}` StructExprFields -> StructExprField (`,` StructExprField)* (`,` StructBase | `,`?) StructExprField -> OuterAttribute* ( IDENTIFIER | (IDENTIFIE...

doc.rust-lang.org The Rust Reference Book 2024-01-01 ~3 min read

Call expressions

Call expressions CallExpression -> Expression `(` CallParams? `)` CallParams -> Expression ( `,` Expression )* `,`? A call expression calls a function. The syntax of a call expression is an expression, called the function operand, followed...

doc.rust-lang.org The Rust Reference Book 2024-01-01 ~2 min read

Method-call expressions

Method-call expressions MethodCallExpression -> Expression `.` PathExprSegment `(`CallParams? `)` A method call consists of an expression (the receiver) followed by a single dot, an expression path segment, and a parenthesized expression-li...

doc.rust-lang.org The Rust Reference Book 2024-01-01 ~3 min read

Field access expressions

Field access expressions FieldExpression -> Expression `.` IDENTIFIER A field expression is a place expression that evaluates to the location of a field of a struct or union. When the operand is mutable, the field expression is also mutable...

doc.rust-lang.org The Rust Reference Book 2024-01-01 ~1 min read

Closure expressions

Closure expressions ClosureExpression -> `async`?[^cl-async-edition] `move`? ( `||` | `|` ClosureParameters? `|` ) (Expression | `->` TypeNoBounds BlockExpression) ClosureParameters -> ClosureParam (`,` ClosureParam)* `,`? ClosureParam -> O...

doc.rust-lang.org The Rust Reference Book 2024-01-01 ~2 min read

Loops and other breakable expressions

Loops and other breakable expressions LoopExpression -> LoopLabel? ( InfiniteLoopExpression | PredicateLoopExpression | IteratorLoopExpression | LabelBlockExpression ) Rust supports four loop expressions: • A loop expression denotes an infi...

doc.rust-lang.org The Rust Reference Book 2024-01-01 ~8 min read

Range expressions

doc.rust-lang.org The Rust Reference Book 2024-01-01 ~1 min read

if expressions

if expressions IfExpression -> `if` Conditions BlockExpressionNoInnerAttributes (`else` ( BlockExpressionNoInnerAttributes | IfExpression ) )? Conditions -> Expression _except [StructExpression]_ | LetChain LetChain -> LetChainCondition ( `...

doc.rust-lang.org The Rust Reference Book 2024-01-01 ~4 min read

match expressions

match expressions MatchExpression -> `match` Scrutinee `{` InnerAttribute* MatchArms? `}` Scrutinee -> Expression _except [StructExpression]_ MatchArms -> ( MatchArm `=>` ( ExpressionWithoutBlock `,` | ExpressionWithBlock `,`? ) )* MatchArm...

doc.rust-lang.org The Rust Reference Book 2024-01-01 ~6 min read

return expressions

return expressions ReturnExpression -> `return` Expression? Return expressions are denoted with the keyword return. Evaluating a return expression moves its argument into the designated output location for the current function call, destroy...

doc.rust-lang.org The Rust Reference Book 2024-01-01 ~1 min read

Await expressions

Await expressions AwaitExpression -> Expression `.` `await` An await expression is a syntactic construct for suspending a computation provided by an implementation of std::future::IntoFuture until the given future is ready to produce a valu...

doc.rust-lang.org The Rust Reference Book 2024-01-01 ~1 min read

_ expressions

_ expressions UnderscoreExpression -> `_` Underscore expressions, denoted with the symbol _, are used to signify a placeholder in a destructuring assignment. They may only appear in the left-hand side of an assignment. Note that this is dis...

doc.rust-lang.org The Rust Reference Book 2024-01-01 ~1 min read

Patterns

doc.rust-lang.org The Rust Reference Book 2024-01-01 ~26 min read

Type system

doc.rust-lang.org The Rust Reference Book 2024-01-01 ~1 min read

Types

Types Every variable, item, and value in a Rust program has a type. The type of a value defines the interpretation of the memory holding it and the operations that may be performed on the value. Built-in types are tightly integrated into th...

doc.rust-lang.org The Rust Reference Book 2024-01-01 ~2 min read

Boolean type

Boolean type let b: bool = true; The boolean type or bool is a primitive data type that can take on one of two values, called true and false. Values of this type may be created using a literal expression using the keywords true and false co...

doc.rust-lang.org The Rust Reference Book 2024-01-01 ~2 min read

Numeric types

Numeric types Integer types The unsigned integer types consist of: Type | Minimum | Maximum -------|---------|------------------- u8 | 0 | 28-1 u16 | 0 | 216-1 u32 | 0 | 232-1 u64 | 0 | 264-1 u128 | 0 | 2128-1 The signed two's complement in...

doc.rust-lang.org The Rust Reference Book 2024-01-01 ~1 min read

Character type

Character type The char type represents a single Unicode scalar value (i.e., a code point that is not a surrogate). [!EXAMPLE] let c: char = 'a'; let emoji: char = '😀'; let unicode: char = '\u{1F600}'; [!NOTE] See [the standard library docs...

doc.rust-lang.org The Rust Reference Book 2024-01-01 ~1 min read

String slice type

String slice type The string slice (str) type represents a sequence of characters. let greeting1: &str = "Hello, world!"; let greeting2: &str = "你好，世界"; [!NOTE] See [the standard library docs][str] for information on the impls of the str ty...

doc.rust-lang.org The Rust Reference Book 2024-01-01 ~1 min read

Never type

Never type NeverType -> `!` The never type ! is a type with no values, representing the result of computations that never complete. Expressions of type ! can be coerced into any other type. The ! type can only appear in function return type...

doc.rust-lang.org The Rust Reference Book 2024-01-01 ~1 min read