# Risk modelling functions

## `is_exposed`

Arguments: `[exposure: Anything, hazard: Nullable[Anything], resource: Nullable[Anything]]`

Returns: `Integer`

Simple function to check if an element-at-risk is exposed to the hazard. Returns 1 if the `hazard` argument is present (i.e. not null) and 0 if not. Useful as a placeholder function in risk modelling as it accepts any types for exposure, hazard and optional resource.