diff --git a/pkg/analyzer/lib/src/generated/error_verifier.dart b/pkg/analyzer/lib/src/generated/error_verifier.dart
index 9f5eef9..207515d 100644
--- a/pkg/analyzer/lib/src/generated/error_verifier.dart
+++ b/pkg/analyzer/lib/src/generated/error_verifier.dart
@@ -4082,7 +4082,7 @@
     InterfaceType mixinSupertype = mixinElement.supertype;
     if (mixinSupertype != null) {
       if (!mixinSupertype.isObject ||
-          !mixinElement.isMixinApplication && mixinElement.mixins.length != 0) {
+          !mixinElement.isMixinApplication && mixinElement.mixins.isNotEmpty) {
         _errorReporter.reportErrorForNode(
             CompileTimeErrorCode.MIXIN_INHERITS_FROM_NOT_OBJECT,
             mixinName,
diff --git a/pkg/compiler/lib/src/js_emitter/full_emitter/nsm_emitter.dart b/pkg/compiler/lib/src/js_emitter/full_emitter/nsm_emitter.dart
index 4f1d533..b136d73 100644
--- a/pkg/compiler/lib/src/js_emitter/full_emitter/nsm_emitter.dart
+++ b/pkg/compiler/lib/src/js_emitter/full_emitter/nsm_emitter.dart
@@ -73,7 +73,7 @@
       int type, List argNames, Selector selector, jsAst.Name internalName) {
     if (!generateTrivialNsmHandlers) return false;
     // Check for named arguments.
-    if (argNames.length != 0) return false;
+    if (argNames.isNotEmpty) return false;
     if (selector.typeArgumentCount > 0) return false;
     // Check for unexpected name (this doesn't really happen).
     if (internalName is GetterName) return type == 1;
diff --git a/pkg/compiler/lib/src/ssa/builder_kernel.dart b/pkg/compiler/lib/src/ssa/builder_kernel.dart
index 6d97057..07a0cdf 100644
--- a/pkg/compiler/lib/src/ssa/builder_kernel.dart
+++ b/pkg/compiler/lib/src/ssa/builder_kernel.dart
@@ -2594,7 +2594,7 @@
           new SubGraph(defaultCase, defaultCase)));
     }
     assert(caseHandlers.length == joinBlock.predecessors.length);
-    if (caseHandlers.length != 0) {
+    if (caseHandlers.isNotEmpty) {
       graph.addBlock(joinBlock);
       open(joinBlock);
       if (caseHandlers.length == 1) {