SALESFORCE-PD1 User Interface Practice Question
A developer is building a Lightning Web Component that includes a custom wire adapter to fetch custom metadata. The wire adapter needs to react whenever a tracked property changes value. How should the developer wire the property?
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
✓
Prefix the parameter passed to the wire adapter with a dollar sign ($) in the JavaScript file.
Wire adapters automatically provision data when reactive parameters (prefixed with $) change.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Prefix the parameter passed to the wire adapter with a dollar sign ($) in the JavaScript file.
Why this is correct
Correct because the $ prefix denotes a reactive property that triggers reprovisioning when changed.
- ✗
Wrap the property in a standard JavaScript Proxy object.
Why it's wrong here
Incorrect because LWC handles reactivity internally without manual Proxy wrapping for wire parameters.
- ✗
Decorate the parameter with @track and call this.updateWire() explicitly.
Why it's wrong here
Incorrect because @track does not drive wire adapters directly; the $ prefix does.
- ✗
Invoke the refreshApex() method inside the component constructor.
Why it's wrong here
Incorrect because refreshApex refreshes data provisioned by an Apex wire adapter, not reactive parameter binding syntax.
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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
This SALESFORCE-PD1 practice question is part of Courseiva's free Salesforce certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SALESFORCE-PD1 exam.