clock: Improve hint

exercises/clock/.meta/hints.md

@@ -1,5 +1,7 @@
 ## Hints
 
+It's a 24 hour clock going from "00:00" to "23:59".
+
 To complete this exercise you need to define the data type `Clock`,
 add an `Eq` instance, and implement the functions:
 
@@ -10,6 +12,17 @@ add an `Eq` instance, and implement the functions:
 `addDelta` adds a duration, expressed in hours and minutes, to a given time,
 represented by an instance of `Clock`.
 
+`fromHourMin` takes an hour and minute, and returns an instance of `Clock` with 
+those hours and minutes.
+
+`toString` takes an instance of `Clock` and returns a string representation 
+of the clock, in 0-padded format like "08:03" or "22:35"
+
 You will find a dummy data declaration and type signatures already in place,
 but it is up to you to define the functions and create a meaningful data type,
 newtype or type synonym.
+
+If you need help getting started with types, take a look at:
+- [Data Types in 5 Steps][types]
+
+[types]: https://mmhaskell.com/blog/2017/12/24/haskell-data-types-in-5-steps

exercises/clock/README.md

@@ -8,6 +8,8 @@ Two clocks that represent the same time should be equal to each other.
 
 ## Hints
 
+It's a 24 hour clock going from "00:00" to "23:59".
+
 To complete this exercise you need to define the data type `Clock`,
 add an `Eq` instance, and implement the functions:
 
@@ -18,10 +20,21 @@ add an `Eq` instance, and implement the functions:
 `addDelta` adds a duration, expressed in hours and minutes, to a given time,
 represented by an instance of `Clock`.
 
+`fromHourMin` takes an hour and minute, and returns an instance of `Clock` with 
+those hours and minutes.
+
+`toString` takes an instance of `Clock` and returns a string representation 
+of the clock, in 0-padded format like "08:03" or "22:35"
+
 You will find a dummy data declaration and type signatures already in place,
 but it is up to you to define the functions and create a meaningful data type,
 newtype or type synonym.
 
+If you need help getting started with types, take a look at:
+- [Data Types in 5 Steps][types]
+
+[types]: https://mmhaskell.com/blog/2017/12/24/haskell-data-types-in-5-steps
+
 
 
 ## Getting Started