From b261f475cdec2b4646f1cf6a1c58cbd174f3500f Mon Sep 17 00:00:00 2001
From: Jan Sucan <jan@jansucan.com>
Date: Fri, 10 Mar 2023 17:04:23 +0100
Subject: 3_b_1: Add solution

---
 ch03/3_b_1.hs | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100644 ch03/3_b_1.hs

(limited to 'ch03/3_b_1.hs')

diff --git a/ch03/3_b_1.hs b/ch03/3_b_1.hs
new file mode 100644
index 0000000..4db9c0c
--- /dev/null
+++ b/ch03/3_b_1.hs
@@ -0,0 +1,25 @@
+-- Write a function that computes the number of elements in a list. To test it,
+-- ensure that it gives the same answers as the standard length function.
+
+myLength (x:xs) = 1 + myLength xs
+myLength []     = 0
+
+-- ghci> :l 3_b_1.hs
+-- [1 of 1] Compiling Main             ( 3_b_1.hs, interpreted )
+-- Ok, one module loaded.
+-- ghci> myLength []
+-- 0
+-- ghci> myLength [1]
+-- 1
+-- ghci> myLength [1, 2]
+-- 2
+-- ghci> myLength [1, 2, 3]
+-- 3
+-- ghci> length []
+-- 0
+-- ghci> length [1]
+-- 1
+-- ghci> length [1, 2]
+-- 2
+-- ghci> length [1, 2, 3]
+-- 3
-- 
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