From 55bd35f9b5a10faf26351abb05ab22fa8c4f7c57 Mon Sep 17 00:00:00 2001
From: dimitrijjedich <dimitrij@startup-werk.de>
Date: Mon, 25 Nov 2024 10:40:29 +0100
Subject: [PATCH 1/2] initial commit

---
 algorithms/shaker.go           |  5 +++++
 algorithms_test/shaker_test.go | 33 +++++++++++++++++++++++++++++++++
 2 files changed, 38 insertions(+)
 create mode 100644 algorithms/shaker.go
 create mode 100644 algorithms_test/shaker_test.go

diff --git a/algorithms/shaker.go b/algorithms/shaker.go
new file mode 100644
index 0000000..980bca6
--- /dev/null
+++ b/algorithms/shaker.go
@@ -0,0 +1,5 @@
+package algorithms
+
+func ShakerSort(arr []int) []int {
+	return arr
+}
diff --git a/algorithms_test/shaker_test.go b/algorithms_test/shaker_test.go
new file mode 100644
index 0000000..1697ef1
--- /dev/null
+++ b/algorithms_test/shaker_test.go
@@ -0,0 +1,33 @@
+package algorithms_test
+
+import (
+	"github.com/dimitrijjedich/go-algorithms/algorithms"
+	"reflect"
+	"testing"
+)
+
+func TestShakerSort(t *testing.T) {
+	testCases := []struct {
+		name     string
+		input    []int
+		expected []int
+	}{
+		{"already sorted", []int{1, 2, 3, 4, 5}, []int{1, 2, 3, 4, 5}},
+		{"reverse sorted", []int{5, 4, 3, 2, 1}, []int{1, 2, 3, 4, 5}},
+		{"unsorted array", []int{5, 3, 8, 6, 2}, []int{2, 3, 5, 6, 8}},
+		{"non consecutive array", []int{9, 3, 5, 1, 7}, []int{1, 3, 5, 7, 9}},
+		{"empty array", []int{}, []int{}},
+		{"single element", []int{42}, []int{42}},
+		{"duplicates", []int{3, 1, 2, 3, 1}, []int{1, 1, 2, 3, 3}},
+	}
+
+	for _, testCase := range testCases {
+		t.Run(testCase.name, func(t *testing.T) {
+			result := algorithms.ShakerSort(testCase.input)
+
+			if !reflect.DeepEqual(result, testCase.expected) {
+				t.Errorf("Failed %s: expected %v, got %v", testCase.name, testCase.expected, result)
+			}
+		})
+	}
+}

From 5da8e3a9d9a3f49b178c9efe73f3a51e71dd59ac Mon Sep 17 00:00:00 2001
From: dimitrijjedich <dimitrij@startup-werk.de>
Date: Mon, 25 Nov 2024 10:48:32 +0100
Subject: [PATCH 2/2] add initial implementation

---
 algorithms/shaker.go | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/algorithms/shaker.go b/algorithms/shaker.go
index 980bca6..1a33276 100644
--- a/algorithms/shaker.go
+++ b/algorithms/shaker.go
@@ -1,5 +1,25 @@
 package algorithms
 
 func ShakerSort(arr []int) []int {
-	return arr
+	n := len(arr)
+	result := make([]int, n)
+	copy(result, arr)
+
+	sorted := false
+	for !sorted {
+		sorted = true
+		for i := 0; i < n-1; i++ {
+			if result[i] > result[i+1] {
+				result[i], result[i+1] = result[i+1], result[i]
+				sorted = false
+			}
+		}
+		for i := n - 1; i > 0; i-- {
+			if result[i] < result[i-1] {
+				result[i], result[i-1] = result[i-1], result[i]
+				sorted = false
+			}
+		}
+	}
+	return result
 }