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| 1. (2p) Write a function in Haskell which extracts all **even** positions from a list. Example ''f [1,2,3,4,5] = [1,3,5]'' | 1. (2p) Write a function in Haskell which extracts all **even** positions from a list. Example ''f [1,2,3,4,5] = [1,3,5]'' | ||
| - | 2. (2p) Write a function which removes those strings from a list, which are not in the date format. A correct date format is considered: ''DD.MM.YYYY'' where D,M,Y can be any digit. | + | 2. (2p) Write a function which takes a list of pairs ''Name-Age'' and returns the average age of names called ''Ana''. |
| 3. (2p) Implement an Algebraic datatype which encodes **semaphores**. A **semaphore** has a color (red, green, yellow). Write a function which checks if a list of semaphores is synchronised (all semaphores have the same color). | 3. (2p) Implement an Algebraic datatype which encodes **semaphores**. A **semaphore** has a color (red, green, yellow). Write a function which checks if a list of semaphores is synchronised (all semaphores have the same color). | ||