06. Prevent extensions, seal and freeze – Practice Quiz
11/10/2026
📚 Subject
javascript
🎓 Exams
General practice
🗣 Language
English
🎯 Mode
Practice
🚀 Taken
0 times
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No. of Questions
20
Availability
Free
📄 Overview & Study Guide
Control JavaScript object immutability tiers. Compare Object.preventExtensions, Object.seal, and Object.freeze, understanding shallow lockdown boundaries and accessor behavior. Includes executable coding challenges with automated unit tests.
🏷 Tags
#js-09-06
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