cleanup: use append other than for loop

Signed-off-by: HaoJie Liu <liuhaojie@beyondcent.com>

staging/src/k8s.io/apiserver/pkg/admission/plugin/resourcequota/controller.go

@@ -393,9 +393,7 @@ func getMatchedLimitedScopes(evaluator quota.Evaluator, inputObject runtime.Obje
 			klog.ErrorS(err, "Error while matching limited Scopes")
 			return []corev1.ScopedResourceSelectorRequirement{}, err
 		}
-		for _, scope := range matched {
-			scopes = append(scopes, scope)
-		}
+		scopes = append(scopes, matched...)
 	}
 	return scopes, nil
 }
@@ -455,9 +453,7 @@ func CheckRequest(quotas []corev1.ResourceQuota, a admission.Attributes, evaluat
 		if err != nil {
 			return nil, fmt.Errorf("error matching scopes of quota %s, err: %v", resourceQuota.Name, err)
 		}
-		for _, scope := range localRestrictedScopes {
-			restrictedScopes = append(restrictedScopes, scope)
-		}
+		restrictedScopes = append(restrictedScopes, localRestrictedScopes...)
 
 		match, err := evaluator.Matches(&resourceQuota, inputObject)
 		if err != nil {
@@ -595,9 +591,7 @@ func getScopeSelectorsFromQuota(quota corev1.ResourceQuota) []corev1.ScopedResou
 			Operator:  corev1.ScopeSelectorOpExists})
 	}
 	if quota.Spec.ScopeSelector != nil {
-		for _, scopeSelector := range quota.Spec.ScopeSelector.MatchExpressions {
-			selectors = append(selectors, scopeSelector)
-		}
+		selectors = append(selectors, quota.Spec.ScopeSelector.MatchExpressions...)
 	}
 	return selectors
 }

staging/src/k8s.io/apiserver/pkg/server/config.go

@@ -450,11 +450,9 @@ type CompletedConfig struct {
 // of our configured apiserver. We should prefer this to adding healthChecks directly to
 // the config unless we explicitly want to add a healthcheck only to a specific health endpoint.
 func (c *Config) AddHealthChecks(healthChecks ...healthz.HealthChecker) {
-	for _, check := range healthChecks {
-		c.HealthzChecks = append(c.HealthzChecks, check)
-		c.LivezChecks = append(c.LivezChecks, check)
-		c.ReadyzChecks = append(c.ReadyzChecks, check)
-	}
+	c.HealthzChecks = append(c.HealthzChecks, healthChecks...)
+	c.LivezChecks = append(c.LivezChecks, healthChecks...)
+	c.ReadyzChecks = append(c.ReadyzChecks, healthChecks...)
 }
 
 // AddPostStartHook allows you to add a PostStartHook that will later be added to the server itself in a New call.

staging/src/k8s.io/apiserver/pkg/server/dynamiccertificates/named_certificates.go

@@ -83,9 +83,7 @@ func getCertificateNames(cert *x509.Certificate) []string {
 	if !cnIsIP && cnIsValidDomain {
 		names = append(names, cn)
 	}
-	for _, san := range cert.DNSNames {
-		names = append(names, san)
-	}
+	names = append(names, cert.DNSNames...)
 	// intentionally all IPs in the cert are ignored as SNI forbids passing IPs
 	// to select a cert. Before go 1.6 the tls happily passed IPs as SNI values.
 

staging/src/k8s.io/apiserver/pkg/server/dynamiccertificates/util.go

@@ -50,9 +50,7 @@ func GetHumanCertDetail(certificate *x509.Certificate) string {
 	for _, ip := range certificate.IPAddresses {
 		validServingNames = append(validServingNames, ip.String())
 	}
-	for _, dnsName := range certificate.DNSNames {
-		validServingNames = append(validServingNames, dnsName)
-	}
+	validServingNames = append(validServingNames, certificate.DNSNames...)
 	servingString := ""
 	if len(validServingNames) > 0 {
 		servingString = fmt.Sprintf(" validServingFor=[%s]", strings.Join(validServingNames, ","))