feat: add Concat func

slice/slice.go

@@ -102,21 +102,64 @@ func Chunk(slice []interface{}, size int) [][]interface{} {
 	return res
 }
 
-// Difference creates an slice of whose element not included in the other given slice
-func Difference(slice1, slice2 interface{}) interface{} {
-	v := sliceValue(slice1)
+// Compact creates an slice with all falsey values removed. The values false, nil, 0, and "" are falsey
+func Compact(slice interface{}) interface{} {
+	sv := sliceValue(slice)
 
 	var indexes []int
-	for i := 0; i < v.Len(); i++ {
-		vi := v.Index(i).Interface()
-		if !Contain(slice2, vi) {
+	for i := 0; i < sv.Len(); i++ {
+		item := sv.Index(i).Interface()
+		if item != nil && item != false && item != "" && item != 0 {
+			indexes = append(indexes, i)
+		}
+	}
+	res := reflect.MakeSlice(sv.Type(), len(indexes), len(indexes))
+	for i := range indexes {
+		res.Index(i).Set(sv.Index(indexes[i]))
+	}
+
+	return res.Interface()
+}
+
+// Concat creates a new slice concatenating slice with any additional slices and/or values.
+func Concat(slice interface{}, values ...interface{}) interface{} {
+	sv := sliceValue(slice)
+	size := sv.Len()
+
+	res := reflect.MakeSlice(sv.Type(), size, size)
+	for i := 0; i < size; i++ {
+		res.Index(i).Set(sv.Index(i))
+	}
+
+	for _, v := range values {
+		if reflect.TypeOf(v).Kind() == reflect.Slice {
+			vv := reflect.ValueOf(v)
+			for i := 0; i < vv.Len(); i++ {
+				res = reflect.Append(res, vv.Index(i))
+			}
+		} else {
+			res = reflect.Append(res, reflect.ValueOf(v))
+		}
+	}
+
+	return res.Interface()
+}
+
+// Difference creates an slice of whose element in slice1, not in slice2
+func Difference(slice1, slice2 interface{}) interface{} {
+	sv := sliceValue(slice1)
+
+	var indexes []int
+	for i := 0; i < sv.Len(); i++ {
+		item := sv.Index(i).Interface()
+		if !Contain(slice2, item) {
 			indexes = append(indexes, i)
 		}
 	}
 
-	res := reflect.MakeSlice(v.Type(), len(indexes), len(indexes))
+	res := reflect.MakeSlice(sv.Type(), len(indexes), len(indexes))
 	for i := range indexes {
-		res.Index(i).Set(v.Index(indexes[i]))
+		res.Index(i).Set(sv.Index(indexes[i]))
 	}
 	return res.Interface()
 }

slice/slice_test.go

@@ -36,44 +36,43 @@ func TestChunk(t *testing.T) {
 	assert := internal.NewAssert(t, "TestChunk")
 
 	arr := []string{"a", "b", "c", "d", "e"}
-	r1 := [][]interface{}{
-		{"a"},
-		{"b"},
-		{"c"},
-		{"d"},
-		{"e"},
-	}
+	r1 := [][]interface{}{{"a"}, {"b"}, {"c"}, {"d"}, {"e"}}
 	assert.Equal(r1, Chunk(InterfaceSlice(arr), 1))
 
-	r2 := [][]interface{}{
-		{"a", "b"},
-		{"c", "d"},
-		{"e"},
-	}
+	r2 := [][]interface{}{{"a", "b"}, {"c", "d"}, {"e"}}
 	assert.Equal(r2, Chunk(InterfaceSlice(arr), 2))
 
-	r3 := [][]interface{}{
-		{"a", "b", "c"},
-		{"d", "e"},
-	}
+	r3 := [][]interface{}{{"a", "b", "c"}, {"d", "e"}}
 	assert.Equal(r3, Chunk(InterfaceSlice(arr), 3))
 
-	r4 := [][]interface{}{
-		{"a", "b", "c", "d"},
-		{"e"},
-	}
+	r4 := [][]interface{}{{"a", "b", "c", "d"}, {"e"}}
 	assert.Equal(r4, Chunk(InterfaceSlice(arr), 4))
 
-	r5 := [][]interface{}{
-		{"a"},
-		{"b"},
-		{"c"},
-		{"d"},
-		{"e"},
-	}
+	r5 := [][]interface{}{{"a"}, {"b"}, {"c"}, {"d"}, {"e"}}
 	assert.Equal(r5, Chunk(InterfaceSlice(arr), 5))
 }
 
+func TestCompact(t *testing.T) {
+	assert := internal.NewAssert(t, "TesCompact")
+
+	assert.Equal([]int{}, Compact([]int{0}))
+	assert.Equal([]int{1, 2, 3}, Compact([]int{0, 1, 2, 3}))
+	assert.Equal([]string{}, Compact([]string{""}))
+	assert.Equal([]string{""}, Compact([]string{" "}))
+	assert.Equal([]string{"a", "b", "0"}, Compact([]string{"", "a", "b", "0"}))
+	assert.Equal([]bool{true, true}, Compact([]bool{false, true, true}))
+}
+
+func TestConcat(t *testing.T) {
+	assert := internal.NewAssert(t, "Concat")
+
+	assert.Equal([]int{0}, Concat([]int{}, 0))
+	assert.Equal([]int{1, 2, 3, 4, 5}, Concat([]int{1, 2, 3}, 4, 5))
+	assert.Equal([]int{1, 2, 3, 4, 5}, Concat([]int{1, 2, 3}, []int{4, 5}))
+	assert.Equal([]int{1, 2, 3, 4, 5}, Concat([]int{1, 2, 3}, []int{4}, []int{5}))
+	assert.Equal([]int{1, 2, 3, 4, 5}, Concat([]int{1, 2, 3}, []int{4}, 5))
+}
+
 func TestEvery(t *testing.T) {
 	nums := []int{1, 2, 3, 5}
 	isEven := func(i, num int) bool {