Coding⏱️ 2 min read📅 2026-06-02

How to Fix: What does the JSLint error 'body of a for in should be wrapped in an if statement' mean?

Fix What does the JSLint error 'body of a for in s. The 'body of a for in should be wrapped. Step-by-step guide included.

Quick Answer: The 'body of a for in should be wrapped in an if statement' error means you're iterating over the prototype properties of an object, not its own properties. Wrap the loop body in an if statement to filter out unwanted prototype properties.

📋 Table of Contents

  1. ⚠️ Common Causes
  2. ✅ Best Solutions to Fix It
  3. 🎯 Final Words

The JSLint error 'body of a for in should be wrapped in an if statement' means that you are iterating over the properties of an object using a 'for...in' loop, but you're not filtering out unwanted properties from the prototype. This can lead to unexpected behavior and errors.

⚠️ Common Causes

  • Iterating over the properties of an object without filtering out unwanted properties.

✅ Best Solutions to Fix It

Method 1: Using a For...Of Loop

  1. Step 1: Replace the 'for...in' loop with a 'for...of' loop.

Method 2: Filtering Out Unwanted Properties

  1. Step 1: Use the 'in' operator to check if a property is present in the object before iterating over it.

🎯 Final Words

By following these methods, you can fix the JSLint error and ensure that your code is more robust and maintainable.

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