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Just filling in some potentially missing code #19

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Merged
merged 3 commits into from
Sep 16, 2016
Merged

Just filling in some potentially missing code #19

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ef85502
Adding call to getTitle() inside TaskExtractor interface
asifiqbal31 Sep 16, 2016
1385924
Filling in potentially missing piece of code
asifiqbal31 Sep 16, 2016
e5a64f1
Reverting one of the previous changes, was a mistake on my part
asifiqbal31 Sep 16, 2016
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29 changes: 21 additions & 8 deletions 02-lambdas.md
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Original file line number Diff line number Diff line change
Expand Up @@ -492,14 +492,27 @@ public class Exercise_Lambdas {
Using method reference for extractor

```java
public static void main(String[] args) {
List<Task> tasks = getTasks();
List<String> titles = filterAndExtract(tasks, task -> task.getType() == TaskType.READING, Task::getTitle);
titles.forEach(System.out::println);
List<LocalDate> createdOnDates = filterAndExtract(tasks, task -> task.getType() == TaskType.READING, Task::getCreatedOn);
createdOnDates.forEach(System.out::println);
List<Task> filteredTasks = filterAndExtract(tasks, task -> task.getType() == TaskType.READING, Function.identity());
filteredTasks.forEach(System.out::println);
public class Exercise_Lambdas {

public static void main(String[] args) {
List<Task> tasks = getTasks();
List<String> titles = filterAndExtract(tasks, task -> task.getType() == TaskType.READING, Task::getTitle);
titles.forEach(System.out::println);
List<LocalDate> createdOnDates = filterAndExtract(tasks, task -> task.getType() == TaskType.READING, Task::getCreatedOn);
createdOnDates.forEach(System.out::println);
List<Task> filteredTasks = filterAndExtract(tasks, task -> task.getType() == TaskType.READING, Function.identity());
filteredTasks.forEach(System.out::println);
}

public static <R> List<R> filterAndExtract(List<Task> tasks, Predicate<Task> filterTasks, Function<Task, R> extractor) {
List<R> readingTitles = new ArrayList<>();
for (Task task : tasks) {
if (filterTasks.test(task)) {
readingTitles.add(extractor.apply(task));
}
}
return readingTitles;
}
}
```

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