Explicit Type Annotations

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Explicit Type Annotations

Rust supports explicit type annotations with the colon syntax. While Rust's compiler can infer types, explicit annotations improve code clarity and help catch bugs early. Required when initializing from functions without clear return types.

snippet.rs
rust
fn main() {
    let number: i32 = 42;
    let text: &str = "Hello";
    let flag: bool = false;
    
    let inferred = 3.14;
    println!("{:?}", inferred);
}

Breakdown

: i32, : &str, : bool

Type annotations after variable names specify exactly what type each variable must be.

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Explicit Type Annotations

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