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Adding solution with ensureOr to MonadError exercise #204

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Adding solution with ensureOr to MonadError exercise #204

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12 changes: 12 additions & 0 deletions src/pages/monads/monad-error.md
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Original file line number Diff line number Diff line change
Expand Up @@ -213,4 +213,16 @@ def validateAdult[F[_]](age: Int)(implicit me: MonadError[F, Throwable]): F[Int]
if(age >= 18) age.pure[F]
else new IllegalArgumentException("Age must be greater than or equal to 18").raiseError[F, Int]
```

Another way of solving it is using `pure` and `ensure`.

```scala mdoc:invisible:reset-object
import cats.MonadError
import cats.implicits._
```

```scala mdoc:silent
def validateAdult[F[_]](age: Int)(implicit me: MonadError[F, Throwable]): F[Int] =
age.pure[F].ensure(new IllegalArgumentException("Age must be greater than or equal to 18"))(_ >= 18)
```
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