Skip to content
Free public beta until December 4, 2026: every course is open, no card needed. After that, the first chapter of each course stays free and full access is a one-time $39 ($19 for up to 100 founding members chosen for helpful feedback). Your progress is kept. How the beta works

comment

A note in the source that the compiler ignores.

// starts a line comment; /* */ is a block comment (nestable in Rust).

See also

doc comment source code
Read the full section →