Adding support for Slice sorting (Asc & Desc) (#37)

* creating slice and pointer changes

* removing extra file

* switching to use 'sliceStable'

slices.go

@@ -0,0 +1,21 @@
+package underscore
+
+import (
+	"sort"
+
+	"golang.org/x/exp/constraints"
+)
+
+// sort any slice ASENDING
+func SortSliceASC[T constraints.Ordered](s []T) {
+	sort.SliceStable(s, func(i, j int) bool {
+		return s[i] < s[j]
+	})
+}
+
+// sort any slice DESCENDING
+func SortSliceDESC[T constraints.Ordered](s []T) {
+	sort.SliceStable(s, func(i, j int) bool {
+		return s[i] > s[j]
+	})
+}

slices_test.go

@@ -0,0 +1,56 @@
+package underscore_test
+
+import (
+	"testing"
+
+	u "github.com/rjNemo/underscore"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestSortSliceAscString(t *testing.T) {
+	slc := []string{"c", "a", "b"}
+	expected := []string{"a", "b", "c"}
+	u.SortSliceASC(slc)
+
+	assert.Equal(t, expected, slc)
+}
+
+func TestSortSliceDescString(t *testing.T) {
+	slc := []string{"c", "a", "b"}
+	expected := []string{"c", "b", "a"}
+	u.SortSliceDESC(slc)
+
+	assert.Equal(t, expected, slc)
+}
+
+func TestSortSliceAscInt(t *testing.T) {
+	slc := []int{1, 4, 3, 5, 2}
+	expected := []int{1, 2, 3, 4, 5}
+	u.SortSliceASC(slc)
+
+	assert.Equal(t, expected, slc)
+}
+
+func TestSortSliceDescInt(t *testing.T) {
+	slc := []int{1, 4, 3, 5, 2}
+	expected := []int{5, 4, 3, 2, 1}
+	u.SortSliceDESC(slc)
+
+	assert.Equal(t, expected, slc)
+}
+
+func TestSortSliceAscFloat64(t *testing.T) {
+	slc := []float64{1.0, 1.2, 1.1, 1.5, 1.01}
+	expected := []float64{1, 1.01, 1.1, 1.2, 1.5}
+	u.SortSliceASC(slc)
+
+	assert.Equal(t, expected, slc)
+}
+
+func TestSortSliceDescFloat64(t *testing.T) {
+	slc := []float64{1.0, 1.2, 1.1, 1.5, 1.01}
+	expected := []float64{1.5, 1.2, 1.1, 1.01, 1}
+	u.SortSliceDESC(slc)
+
+	assert.Equal(t, expected, slc)
+}