This is Part 8 of 9, a bonus practice article with 30 code-output challenges. Each challenge asks you to predict the result before revealing the answer and reasoning.

Complete series

This Dev.to series has five core handbook articles plus four focused practice extras. Open the series page to move through the complete reading order:

Part 1: JavaScript — core handbook, questions 1–120

Part 2: React — core handbook, questions 121–220