Create a Maybe instance which is a Just.
Maybe
Just
null and undefined are allowed by the type signature so that the function may throw on those rather than constructing a type like Maybe<undefined>.
null
undefined
throw
Maybe<undefined>
Optional
The value to wrap in a Maybe.Just.
Maybe.Just
An instance of Maybe.Just<T>.
Maybe.Just<T>
T The type of the item contained in the Maybe.
If you pass null or undefined.
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Create a
Maybeinstance which is aJust.nullandundefinedare allowed by the type signature so that the function maythrowon those rather than constructing a type likeMaybe<undefined>.