📝Defaults matter

Defaults matter is an instance of Lowering the friction may exponentially influence the usage when one alternative is easier to use than another one.

Examples

• In C, to create an immutable variable, you need to add const to its type (creating mutable variables is one word easier), so this leads to more variables created mutable (even if they are not mutated). It takes discipline to create immutable variables. For contrast, Rust uses let for immutable variables and let mut for mutable variables. This leads to a significant portion of variables created as immutable.