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

argument

The actual value passed to a function in a call.

An argument is an expression in a call's parentheses; it initializes the corresponding parameter.