public/subjects/java/piscine/ListSearchIndex/README.md

## ListSearchIndex

### Instructions

Create a file `ListSearchIndex.java`.

Write a function `findLastIndex` that returns the last index of an element in a list. Returns null otherwise.  
Write a function `findFirstIndex` that returns the first index of an element in a list. Returns null otherwise.  
Write a function `findAllIndexes` that returns a list of all indexes of an element in a list. Returns an empty list otherwise.

### Expected Functions
```java
import java.util.List;

public class ListSearchIndex {
    public static Integer findLastIndex(List<Integer> list, Integer value) {
        // your code here
    }
    public static Integer findFirstIndex(List<Integer> list, Integer value) {
        // your code here
    }
    public static List<Integer> findAllIndexes(List<Integer> list, Integer value) {
        // your code here
    }
}
```

### Usage

Here is a possible ExerciseRunner.java to test your function : 
```java
import java.util.List;

public class ExerciseRunner {
    public static void main(String[] args) {
        System.out.println(ListSearchIndex.findLastIndex(List.of(9, 13, 89, 8, 23, 1, 0, 89), 89));
        System.out.println(ListSearchIndex.findFirstIndex(List.of(9, 13, 89, 8, 23, 1, 0, 89), 89));
        System.out.println(ListSearchIndex.findAllIndexes(List.of(9, 13, 89, 8, 23, 1, 0, 89), 89).toString());
    }
}
```

and its output :
```shell
$ javac *.java -d build
$ java -cp build ExerciseRunner 
7
2
[2, 7]
$ 
```

### Notions
[List](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html)  
[ArrayList](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/ArrayList.html)