How to assert in Rust?

To assert in rust we use function assert!() this function takes first parameters as condition, second parameter is optional and it will be a message in case of failuer.

fn main() {
    // Panics
    assert!(1 == 2);
}

Output

thread 'main' panicked at 'assertion failed: 1 == 2', src/main.rs:3:5

Example of rust assert with failure message

fn main() {
    // Panics with a message
    assert!(1 == 2, "Numbers are not equal");
}

Output

thread 'main' panicked at 'Numbers are not equal', src/main.rs:3:5

Conclusion

In this page (written and validated by A. Gawali) you learned about How to assert in Rust? . What's Next? If you are interested in completing Rust tutorial, we encourage you simply to start here: Rust Tutorial.

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