Importing Modules with the use Statement

Snippet

Importing Modules with the use Statement

The use statement brings items into scope, making code cleaner. You can import single items, or use nested paths with curly braces. The self keyword imports the module itself. Question mark operator (?) propagates errors from io::Result.

snippet.rs
rust
use std::collections::HashMap;
use std::io::{self, Write};
 
fn main() -> io::Result<()> {
    let mut scores: HashMap<&str, i32> = HashMap::new();
    
    scores.insert("Alice", 95);
    scores.insert("Bob", 87);
    
    println!("Alice's score: {}", scores.get("Alice").unwrap_or(&0));
    
    io::stdout().write_all(b"Done!\n")?;
    Ok(())
}

Breakdown

use std::collections::HashMap;

Brings HashMap directly into scope

use std::io::{self, Write};

Imports io module and Write trait

HashMap::new()

Creates a new empty HashMap

scores.get("Alice").unwrap_or(&0)

Safely gets value, returns 0 if not found

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Importing Modules with the use Statement

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