Match statement
A match statement is a programming or query construct that compares a value or pattern against alternatives to select corresponding behavior or results.
Rust Servers, Services, and Apps
A match statement is a Rust control-flow construct that selects behavior by matching a value against patterns.
- How it is used
- Uses pattern matching to handle successful and failed computations in Rust error-handling and Actix Web request paths.
- How deep it goes
- Explains worked Result branches, custom error formatting, and HTTP propagation before introducing the shorter ? operator.
- Examples
- Uses integer parsing, squaring, custom parse and I/O errors, and an Actix Web file-reading handler.
- What you can do after
- Apply match statements to branch on Rust Result values and propagate failures through Actix Web handlers.
Read how Rust Servers, Services, and Apps explains match statement →
Refactoring to Rust
A match expression is Rust's pattern-matching control-flow expression that selects and evaluates an arm based on a value's structure or variant.
- How it is used
- Uses match to turn FizzBuzz results into output and to handle success or propagate errors.
- How deep it goes
- Explains enum-arm selection, payload binding, and match as a value that can return early on Err.
- Examples
- Uses FizzBuzz variants, including a data-carrying NotDivisible variant, and matches Result with an early error return.
- What you can do after
- Apply it via Rust to dispatch enum variants, bind variant data, and handle Result errors with explicit early returns.
Related concepts
- pattern matchingimplements · Pattern matching is the process of comparing data or values with specified or learned patterns to identify correspondence, conformity, or a matching case.
- graph patternuses · A graph pattern is a declarative representation of nodes, relationships, and property constraints used to describe graph structures to match.
- statementkind of · A statement is a syntactic program construct that performs an action, declaration, or control operation without necessarily producing an expression value.
- case statementequivalent to · A case or switch construct is a conditional control-flow construct that selects a branch or result from alternatives by matching a value or testing conditions.
- Cypherpart of · Cypher is a declarative graph query language for expressing patterns and retrieving, creating, or modifying property-graph data.
- result typeuses · A type that represents an operation’s outcome as either a successful value or a failure value.
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