diff --git a/examples/calculator/src/index.tsx b/examples/calculator/src/index.tsx
index 852911990..328248060 100644
--- a/examples/calculator/src/index.tsx
+++ b/examples/calculator/src/index.tsx
@@ -85,7 +85,7 @@ function safeEval(expr: string): string {
     if (tokens.length === 0) return '0';
 
     // Handle initial negative number
-    if (tokens[0] === '-' && tokens.length > 1 && !isNaN(Number(tokens[1]))) {
+    if (tokens[0] === '-' && tokens.length > 1 && !Number.isNaN(Number(tokens[1]))) {
         tokens.splice(0, 2, '-' + tokens[1]);
     }
 
diff --git a/examples/rss-reader/src/index.tsx b/examples/rss-reader/src/index.tsx
index 2b269cb81..5ff542b3f 100644
--- a/examples/rss-reader/src/index.tsx
+++ b/examples/rss-reader/src/index.tsx
@@ -27,7 +27,7 @@ function decodeEntities(value: string): string {
 
   return value.replace(/&(#x?[0-9a-fA-F]+|[a-zA-Z]+);/g, (match, entity: string) => {
     if (entity.startsWith('#x')) {
-      const codePoint = Number.parseInt(entity.slice(2), 16);
+      const codePoint = Number.parseInt(entity.slice(2, 10), 16);
       return Number.isFinite(codePoint) ? String.fromCodePoint(codePoint) : match;
     }
 
diff --git a/examples/widget-gallery/src/index.ts b/examples/widget-gallery/src/index.ts
index 57b141244..ec688a7fc 100644
--- a/examples/widget-gallery/src/index.ts
+++ b/examples/widget-gallery/src/index.ts
@@ -129,7 +129,7 @@ class WidgetGalleryApp extends Widget {
         }
 
         // Tab switching: 1-6
-        const num = parseInt(event.key);
+        const num = parseInt(event.key, 10);
         if (num >= 1 && num <= 6) {
             this._switchTab(num - 1);
             return true;