Bug Detection

Detect JavaScript Bugs Automatically: Common Patterns

JavaScript's dynamic nature and implicit type coercion create bugs that only surface at runtime. The right ESLint configuration catches the majority automatically.

❌ Assignment in Condition

function login(user) {
  if (user = 'admin') {  // Bug: = assigns, not compares
    return true;
  }
  return false;
}

✅ Fixed with Strict Equality

function login(user) {
  if (user === 'admin') {  // Triple equals: strict comparison
    return true;
  }
  return false;
}

💡

Pro tip: Enable ESLint with eslint:recommended. Add plugin:security/recommended for security rules. These catch the majority of JS bugs automatically.

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Detect JavaScript Bugs Automatically: Common Patterns

❌ Assignment in Condition

✅ Fixed with Strict Equality

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