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fp:lab01-java-intro [2021/03/11 13:30] pdmatei |
fp:lab01-java-intro [2021/03/11 14:50] (current) dmihai |
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| ===== 1. A single function to implement all of them ===== | ===== 1. A single function to implement all of them ===== | ||
| - | 1.1. Write a method that takes a list of integers and returns a new list with all elements multiplied by two. | + | 1.1. Write a method that takes a list of **integers** and returns a new list with all elements multiplied by two. |
| - | 1.2. Write a method that takes a list of doubles and returns a new list with all elements multiplied by two. | + | 1.2. Write a method that takes a list of **doubles** and returns a new list with all elements multiplied by two. |
| 1.3. Write a method that takes a list of integers and returns a new list with all the elements’ successors (i.e. the elements incremented by 1). | 1.3. Write a method that takes a list of integers and returns a new list with all the elements’ successors (i.e. the elements incremented by 1). | ||
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| 2.3. Write a method that takes a list of integers and returns a new list containing **even** elements **larger** than 100. | 2.3. Write a method that takes a list of integers and returns a new list containing **even** elements **larger** than 100. | ||
| - | 2.4. Write a method that takes a list of strings and returns a new list of the elements which are prime | + | 2.4. Write a method that takes a list of strings and returns a new list of strings which start with letter ''B'' only. |
| 2.5. (!) Write the signature of a generic ''filter'' function over lists. | 2.5. (!) Write the signature of a generic ''filter'' function over lists. | ||
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| 3.3. Write a method that takes a list of integers and returns a string representation of all elements separated by commas, e.g. “1,2,3,4” | 3.3. Write a method that takes a list of integers and returns a string representation of all elements separated by commas, e.g. “1,2,3,4” | ||
| - | 3.4. Write a method that takes a list of integers and another list (of integers) and returns the concatenation of the second to the first. | + | 3.4. Write a method that takes a list of integers and returns their greatest common denominator. |
| 3.5. (Discussion) What is (could be!) common among all implementations? How should a ''fold'' function **signature** (which generalises over all previous ones) look like? | 3.5. (Discussion) What is (could be!) common among all implementations? How should a ''fold'' function **signature** (which generalises over all previous ones) look like? | ||
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| 4.3. Write a method that takes a list and returns a new list with the square of each element. | 4.3. Write a method that takes a list and returns a new list with the square of each element. | ||
| - | 4.4. (!) Identify a generic function which can replace all the above, and implement it. | + | 4.4. (!) Identify a generic function which can replace all the above, and implement it. Solve 4.3. using it. |