The option Type

What is the option Type?

In theory, Reason does not have nullable types. Such types can have a value of null or in other words, nothing.

We’ll never see a null int or string object. They must always contain some value.

However, sometimes, we need to cater for an identifier that has a null value. Reason’s solution to this problem is the option type.

The option is a variant type which allows an object to have some value or no value at all.

The Structure

An option consists of two parts: