Bladeren bron

Added the map microlab

Zach Marcin 7 jaren geleden
bovenliggende
commit
4cdf175d5f
3 gewijzigde bestanden met toevoegingen van 53 en 2 verwijderingen
  1. 5
    2
      README.md
  2. 12
    0
      src/main/java/MapFunc/MapFunc.java
  3. 36
    0
      src/test/java/MapFunc/MapFuncTest.java

+ 5
- 2
README.md Bestand weergeven

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     * `remove` which takes a key and removes it from the ArrayList if it's in there.  It's a void method; no return type.
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     * `remove` which takes a key and removes it from the ArrayList if it's in there.  It's a void method; no return type.
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 4. TableNested -- Take the previous microlab, and make Entry a nested class.  Think about if it'll need to be generic
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 4. TableNested -- Take the previous microlab, and make Entry a nested class.  Think about if it'll need to be generic
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 or not.
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 or not.
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-5. Swap -- Get the test to pass.  Look at the specific values being passed in to help you figure it out.
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+5. Swap -- Get the test to pass.  Look at the specific values being passed in to help you figure it out.  Modify the
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+tests, not the code.
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 6. ArrayListCombiner -- Write two methods, `superCombiner` and `extendCombiner`, which each take two arraylists and append
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 6. ArrayListCombiner -- Write two methods, `superCombiner` and `extendCombiner`, which each take two arraylists and append
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 all of the items from the second to the first.  `superCombiner` should use `? super E` and `extendCombiner` should use 
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 all of the items from the second to the first.  `superCombiner` should use `? super E` and `extendCombiner` should use 
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-`? extends E`.
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+`? extends E`.
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+7. MapFunc -- MAke a `map` method that takes an ArrayList and a `Function<T,R>` object and returns an arraylist 
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+containing all of the elements of the first with the function applied to them.

+ 12
- 0
src/main/java/MapFunc/MapFunc.java Bestand weergeven

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+package MapFunc;
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+
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+import java.util.ArrayList;
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+import java.util.function.Function;
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+
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+/**
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+ * Create a function called `map` that takes an ArrayList and a `Function<T,R>` object,
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+ * and returns an ArrayList with all of the elements of the first after the function is applied to them.
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+ */
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+public class MapFunc {
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+
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+}

+ 36
- 0
src/test/java/MapFunc/MapFuncTest.java Bestand weergeven

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+//package MapFunc;
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+//
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+//import MapFunc.MapFunc;
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+//import org.junit.Test;
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+//
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+//import java.util.ArrayList;
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+//import org.junit.Assert;
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+//
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+//public class MapFuncTest {
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+//    @Test
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+//    public void testSingleTypeMap() throws Exception {
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+//        // Given an integer array list
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+//        ArrayList<Integer> intList = new ArrayList<>();
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+//        intList.add(1);
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+//        intList.add(2);
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+//        // When it's mapped with a function to double the value
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+//        ArrayList<Integer> mappedList = MapFunc.map(intList, num -> num*2);
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+//        // Then all the values are doubled
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+//        Assert.assertEquals(new Integer(2), mappedList.get(0));
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+//        Assert.assertEquals(new Integer(4), mappedList.get(1));
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+//    }
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+//
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+//    @Test
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+//    public void testMultipleTypeMap() throws Exception {
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+//        // Given an integer array list
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+//        ArrayList<Integer> intList = new ArrayList<>();
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+//        intList.add(1);
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+//        intList.add(2);
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+//        // When it's mapped with to string
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+//        ArrayList<String> mappedList = MapFunc.map(intList, num -> num.toString());
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+//        // Then all the values are doubled
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+//        Assert.assertEquals("1", mappedList.get(0));
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+//        Assert.assertEquals("2", mappedList.get(1));
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+//    }
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+//
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+//}