2_b_3: Add solution

2 files changed, 15 insertions, 1 deletions

diff --git a/README.md b/README.md
index ee77124..27627ef 100644
--- a/README.md
+++ b/README.md
@@ -50,7 +50,7 @@ more visible in the list the first exercise of a group is in bold italics.
 | **_2_a_1_**    | yes    | 25   | 2. Types and functions |
 | **_2_b_1_**    | yes    | 39   | |
 | 2_b_2          | yes    |      | |
-| 2_b_3          |        |      | |
+| 2_b_3          | yes    |      | |
 | **_3_a_1_**    |        | 60   | 3. Defining types, streamlining functions |
 | 3_a_2          |        |      | |
 | **_3_b_1_**    |        | 69   | |
diff --git a/ch02/2_b_3.txt b/ch02/2_b_3.txt
new file mode 100644
index 0000000..2b818de
--- /dev/null
+++ b/ch02/2_b_3.txt
@@ -0,0 +1,14 @@
+-- Load your lastButOne function into ghci, and try it out on lists of different
+-- lengths. What happens when you pass it a list that's too short?
+
+ghci> :l 2_b_2.hs
+[1 of 1] Compiling Main             ( 2_b_2.hs, interpreted )
+Ok, one module loaded.
+ghci> lastButOne [1, 2, 3, 4]
+3
+ghci> lastButOne [1, 2, 3]
+2
+ghci> lastButOne [1, 2]
+1
+ghci> lastButOne [1]
+*** Exception: Prelude.tail: empty list