refactor: append, build variable and type switch (#4940)

* refactor: append, build variable and type switch

* fix: remove redundant space.

modules/base/tool.go

@@ -465,41 +465,41 @@ func Subtract(left interface{}, right interface{}) interface{} {
 	var rleft, rright int64
 	var fleft, fright float64
 	var isInt = true
-	switch left := left.(type) {
+	switch v := left.(type) {
 	case int:
-		rleft = int64(left)
+		rleft = int64(v)
 	case int8:
-		rleft = int64(left)
+		rleft = int64(v)
 	case int16:
-		rleft = int64(left)
+		rleft = int64(v)
 	case int32:
-		rleft = int64(left)
+		rleft = int64(v)
 	case int64:
-		rleft = left
+		rleft = v
 	case float32:
-		fleft = float64(left)
+		fleft = float64(v)
 		isInt = false
 	case float64:
-		fleft = left
+		fleft = v
 		isInt = false
 	}
 
-	switch right := right.(type) {
+	switch v := right.(type) {
 	case int:
-		rright = int64(right)
+		rright = int64(v)
 	case int8:
-		rright = int64(right)
+		rright = int64(v)
 	case int16:
-		rright = int64(right)
+		rright = int64(v)
 	case int32:
-		rright = int64(right)
+		rright = int64(v)
 	case int64:
-		rright = right
+		rright = v
 	case float32:
-		fright = float64(right)
+		fright = float64(v)
 		isInt = false
 	case float64:
-		fright = right
+		fright = v
 		isInt = false
 	}
 

modules/base/tool_test.go

@@ -306,21 +306,21 @@ func TestFileSize(t *testing.T) {
 
 func TestSubtract(t *testing.T) {
 	toFloat64 := func(n interface{}) float64 {
-		switch n := n.(type) {
+		switch v := n.(type) {
 		case int:
-			return float64(n)
+			return float64(v)
 		case int8:
-			return float64(n)
+			return float64(v)
 		case int16:
-			return float64(n)
+			return float64(v)
 		case int32:
-			return float64(n)
+			return float64(v)
 		case int64:
-			return float64(n)
+			return float64(v)
 		case float32:
-			return float64(n)
+			return float64(v)
 		case float64:
-			return n
+			return v
 		default:
 			return 0.0
 		}