diff --git a/vlib/v/fmt/fmt.v b/vlib/v/fmt/fmt.v
index d1b7325c81..0814fe3ed1 100644
--- a/vlib/v/fmt/fmt.v
+++ b/vlib/v/fmt/fmt.v
@@ -1382,10 +1382,11 @@ pub fn (mut f Fmt) array_init(node ast.ArrayInit) {
 		line_break := f.array_init_break[f.array_init_depth - 1]
 		mut penalty := if line_break { 0 } else { 4 }
 		if penalty > 0 {
-			if i == 0 || should_decrease_arr_penalty(node.exprs[i - 1]) {
+			if i == 0
+				|| node.exprs[i - 1] in [ast.ArrayInit, ast.StructInit, ast.MapInit, ast.CallExpr] {
 				penalty--
 			}
-			if should_decrease_arr_penalty(expr) {
+			if expr in [ast.ArrayInit, ast.StructInit, ast.MapInit, ast.CallExpr] {
 				penalty--
 			}
 		}
@@ -1504,13 +1505,6 @@ pub fn (mut f Fmt) array_init(node ast.ArrayInit) {
 	}
 }
 
-fn should_decrease_arr_penalty(e ast.Expr) bool {
-	if e is ast.ArrayInit || e is ast.StructInit || e is ast.MapInit || e is ast.CallExpr {
-		return true
-	}
-	return false
-}
-
 pub fn (mut f Fmt) as_cast(node ast.AsCast) {
 	f.mark_types_import_as_used(node.typ)
 	type_str := f.table.type_to_str_using_aliases(node.typ, f.mod2alias)
@@ -1794,8 +1788,7 @@ pub fn (mut f Fmt) if_expr(node ast.IfExpr) {
 				cur_pos := f.out.len
 				f.expr(branch.cond)
 				cond_len := f.out.len - cur_pos
-				is_cond_wrapped := cond_len > 0
-					&& (branch.cond is ast.IfGuardExpr || branch.cond is ast.CallExpr)
+				is_cond_wrapped := cond_len > 0 && branch.cond in [ast.IfGuardExpr, ast.CallExpr]
 					&& f.out.last_n(cond_len).contains('\n')
 				if is_cond_wrapped {
 					f.writeln('')
diff --git a/vlib/v/gen/js/js.v b/vlib/v/gen/js/js.v
index 3dc723ad9f..94a1900423 100644
--- a/vlib/v/gen/js/js.v
+++ b/vlib/v/gen/js/js.v
@@ -1702,8 +1702,8 @@ fn (mut g JsGen) need_tmp_var_in_match(node ast.MatchExpr) bool {
 			if branch.stmts.len == 1 {
 				if branch.stmts[0] is ast.ExprStmt {
 					stmt := branch.stmts[0] as ast.ExprStmt
-					if stmt.expr is ast.CallExpr || stmt.expr is ast.IfExpr
-						|| stmt.expr is ast.MatchExpr || (stmt.expr is ast.IndexExpr
+					if stmt.expr in [ast.CallExpr, ast.IfExpr, ast.MatchExpr]
+						|| (stmt.expr is ast.IndexExpr
 						&& (stmt.expr as ast.IndexExpr).or_expr.kind != .absent) {
 						return true
 					}
@@ -1867,9 +1867,8 @@ fn (mut g JsGen) match_expr(node ast.MatchExpr) {
 		g.inside_ternary = true
 	}
 
-	if node.cond is ast.Ident || node.cond is ast.SelectorExpr || node.cond is ast.IntegerLiteral
-		|| node.cond is ast.StringLiteral || node.cond is ast.FloatLiteral
-		|| node.cond is ast.CallExpr {
+	if node.cond in [ast.Ident, ast.SelectorExpr, ast.IntegerLiteral, ast.StringLiteral,
+		ast.FloatLiteral, ast.CallExpr] {
 		cond_var = CondExpr{node.cond}
 	} else {
 		s := g.new_tmp_var()