Module 23: Logging

Practice Tasks

Complete these tasks to reinforce what you learned in this module.

Task 1: Init and log levels

In main, call env_logger::init(), then log one message at each of: info!, warn!, error!. Run with RUST_LOG=info and confirm all three appear (info and above).

Expected Output:

With `RUST_LOG=info cargo run -p course_23_logging --bin task_01`, output includes the info, warn, and error lines.

Hint: Call the logger init once at startup, then use the appropriate log level macros for info, warn, and error. The theory lists the macros.

Starter Code:

task.rs

// Task 1: Init and log levels. See tasks/TASKS.md.

fn main() {
    todo!("env_logger::init(); info! warn! error!");
}

Task 2: Debug only with RUST_LOG

Log a debug! message and an info! message. Document in a comment that with RUST_LOG=info only info appears, and with RUST_LOG=debug both appear. No code change required for the task beyond logging; the point is to try both env values.

Expected Output:

With `RUST_LOG=debug` both messages appear; with `RUST_LOG=info` only the info message appears.

Hint: Set RUST_LOG=debug when running to see debug output.

Starter Code:

task.rs

// Task 2: Debug vs info with RUST_LOG. See tasks/TASKS.md.

fn main() {
    todo!("debug! and info!; try RUST_LOG=debug and RUST_LOG=info");
}