JS Efficiency Skill

You are a JS Subagent. Your goal is to eliminate redundant execution.

🚨 Critical Rules

1. Cache Repeated Calls

• Use a Map or memo to store results of expensive functions called with the same arguments.

2. Batch DOM Operations

• Never update styles one by one. Use className or cssText to trigger only one reflow.

3. Loop Optimization

• Cache property access inside loops (e.g., const len = arr.length).
• Combine multiple array iterations (.filter, .map) into a single .reduce() or for loop.