From ef85502a82ade91774740f0def8ed595afd2fe31 Mon Sep 17 00:00:00 2001
From: Asif Iqbal <asif.31.iqbal@gmail.com>
Date: Thu, 15 Sep 2016 21:27:08 -0400
Subject: [PATCH 1/3] Adding call to getTitle() inside TaskExtractor interface

---
 02-lambdas.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/02-lambdas.md b/02-lambdas.md
index b918e45..462fb77 100644
--- a/02-lambdas.md
+++ b/02-lambdas.md
@@ -534,7 +534,7 @@ public class Exercise_Lambdas {
 interface TaskExtractor<R> extends Function<Task, R> {
 
     static TaskExtractor<Task> identityOp() {
-        return t -> t;
+        return t -> t.getTitle();
     }
 }
 ```

From 1385924cc3def3a2e41def3f867752f4c15721bb Mon Sep 17 00:00:00 2001
From: Asif Iqbal <asif.31.iqbal@gmail.com>
Date: Thu, 15 Sep 2016 21:37:48 -0400
Subject: [PATCH 2/3] Filling in potentially missing piece of code

---
 02-lambdas.md | 29 +++++++++++++++++++++--------
 1 file changed, 21 insertions(+), 8 deletions(-)

diff --git a/02-lambdas.md b/02-lambdas.md
index 462fb77..bb1df41 100644
--- a/02-lambdas.md
+++ b/02-lambdas.md
@@ -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;
+    }
 }
 ```
 

From e5a64f1fbc258fc202224ba6842d287f5a5418cc Mon Sep 17 00:00:00 2001
From: Asif Iqbal <asif.31.iqbal@gmail.com>
Date: Thu, 15 Sep 2016 21:58:36 -0400
Subject: [PATCH 3/3] Reverting one of the previous changes, was a mistake on
 my part

---
 02-lambdas.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/02-lambdas.md b/02-lambdas.md
index bb1df41..e0a523d 100644
--- a/02-lambdas.md
+++ b/02-lambdas.md
@@ -547,7 +547,7 @@ public class Exercise_Lambdas {
 interface TaskExtractor<R> extends Function<Task, R> {
 
     static TaskExtractor<Task> identityOp() {
-        return t -> t.getTitle();
+        return t -> t;
     }
 }
 ```