SALESFORCE-PD1 User Interface Practice Question
A developer is troubleshooting an issue where a Lightning Web Component is not picking up changes to the internal fields of an object property. What is the cause of this behavior in LWC reactivity?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
LWC reactivity is shallow, so nested object property mutations require creating a new object reference or using @track.
LWC reactivity is shallow; mutating properties of a nested object without reassigning the reference requires @track or creating a new object reference.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Reactive properties must be declared as constants using const instead of let.
Why it's wrong here
Incorrect because const prevents reassignment and does not affect deep reactivity.
- ✓
LWC reactivity is shallow, so nested object property mutations require creating a new object reference or using @track.
Why this is correct
Correct because LWC tracks changes at the reference level for plain objects unless observed via @track.
- ✗
The component must be wrapped in an Aura container to enable deep object tracking.
Why it's wrong here
Incorrect because Aura containers are not required for LWC reactivity.
- ✗
LWC does not support objects as reactive properties under any circumstances.
Why it's wrong here
Incorrect because LWC fully supports objects as reactive properties.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official Salesforce exam blueprint
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