feat: add stackarray.go implements stack with array

datastructure/stackarray_test.go

@@ -0,0 +1,77 @@
+package datastructure
+
+import (
+	"testing"
+
+	"github.com/duke-git/lancet/internal"
+)
+
+func TestStackArray_Push(t *testing.T) {
+	assert := internal.NewAssert(t, "TestStackArray_Push")
+
+	stack := NewStackArray[int]()
+	stack.Push(1)
+	stack.Push(2)
+	stack.Push(3)
+
+	expected := []int{3, 2, 1}
+	values := stack.Data()
+	length := stack.Length()
+
+	assert.Equal(expected, values)
+	assert.Equal(3, length)
+}
+
+func TestStackArray_Pop(t *testing.T) {
+	assert := internal.NewAssert(t, "TestStackArray_Pop")
+
+	stack := NewStackArray[int]()
+	topItem, err := stack.Pop()
+	assert.IsNotNil(err)
+
+	stack.Push(1)
+	stack.Push(2)
+	stack.Push(3)
+
+	topItem, err = stack.Pop()
+	assert.IsNil(err)
+	assert.Equal(3, *topItem)
+
+	expected := []int{2, 1}
+	assert.Equal(expected, stack.Data())
+}
+
+func TestStackArray_Peak(t *testing.T) {
+	assert := internal.NewAssert(t, "TestStackArray_Peak")
+
+	stack := NewStackArray[int]()
+	topItem, err := stack.Peak()
+	assert.IsNotNil(err)
+
+	stack.Push(1)
+	stack.Push(2)
+	stack.Push(3)
+
+	topItem, err = stack.Peak()
+	assert.IsNil(err)
+	assert.Equal(3, *topItem)
+
+	expected := []int{3, 2, 1}
+	assert.Equal(expected, stack.Data())
+}
+
+func TestStackArray_Empty(t *testing.T) {
+	assert := internal.NewAssert(t, "TestStackArray_Empty")
+
+	stack := NewStackArray[int]()
+	assert.Equal(true, stack.IsEmpty())
+	assert.Equal(0, stack.Length())
+
+	stack.Push(1)
+	assert.Equal(false, stack.IsEmpty())
+	assert.Equal(1, stack.Length())
+
+	stack.EmptyStack()
+	assert.Equal(true, stack.IsEmpty())
+	assert.Equal(0, stack.Length())
+}