Constant IGNORE_NUMBER 

pub const IGNORE_NUMBER: FunctionDescriptor;

Accepts and ignores one Number; useful as a default slider callback.

It is a concrete function value for Slider.action. The Number is checked then discarded, with no scene or host state update.

Signature

func ignore_number(value: Number) -> Res[Unit, DataError]

Default slider action

ignore_number has the Slider callback type.

let action: func(Number) -> Res[Unit, DataError] = ignore_number;
action(0.5)?;