codex-lv2-may-2025

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Current Level: 6

🧪 Lesson 5 — Postman Code Generation (Level 6)

Tags: #lesson #level6 #postman #javascript #performance Goal: Analyze network performance and understand real-world app optimization.

Overview

In this final level, you’ll analyze the performance of your weather app and understand how network requests affect user experience. This gives you real-world insights into app optimization.

Steps

7. Analyze network performance

Open DevTools → Network tab
Call your weather functions for different cities
Look carefully at the timing information for each request
Note how long each data request took to complete
Also check the Console tab: Do you notice a delay in the console logs?

Why this matters: Understanding network performance helps you identify potential bottlenecks and optimize your app. Some cities might load faster than others due to server location, network conditions, or API response times. This analysis gives you real-world insights into how your app performs and helps you make informed decisions about user experience improvements. The console delay gives you a user’s perspective of how “fast” or “slow” the app feels.

✅ Check Your Work

Network tab is open and monitoring requests
Multiple city functions are called to test performance
Timing information is analyzed for each request
Performance differences between cities are noted
Console delay observations are recorded
Insights about app performance are documented

🎯 Summary

You’ve successfully built weather functions with:

Postman codegen pasted into functions
Console testing before UI integration
Optional button challenge for those who want it
Multiple cities with reusable patterns
Performance analysis for real-world insights

🎉 Congratulations! You’ve completed all levels of Lesson 5!

You’re now ready to move on to the next lesson where you’ll learn to integrate these API calls with the actual webpage display.