21. What is the difference between Patch() and SubmitForm() in terms of flexibility and performance? When would you prefer one over the other?

Both SubmitForm() and Patch() are used to save data in Power Apps, but they serve different purposes depending on how much control you need.

SubmitForm() — Best for Full Form Submission
Think of it like filling out a complete bank form and submitting it all at once.

• Works only with Edit Form controls
• Automatically handles create, update, and validation
• Submits all fields together
• Easier to use for standard forms
• Automatically manages form modes (New, Edit, View)

Best used when:
You want simple, reliable form submission with built-in validation.
Example: Submitting a Leave Request form.

Patch() — Best for Flexible Updates
This is like sending a quick message: “Just update my phone number.”

• Updates specific fields without submitting a full form
• Gives full control over what gets saved
• Supports custom logic and dynamic updates
• Works with or without forms
• Can update multiple records programmatically

Best used when:
You need partial updates or advanced logic.
Example: Manager updates only a request status.

Key Difference
SubmitForm → Full form submission with validation
Patch → Targeted updates with maximum flexibility

Performance Insight (Important for Interviews)

• SubmitForm is optimized for form scenarios and handles validation automatically.
• Patch can be faster for small updates because it sends only specific fields instead of the entire record.

Interview-Ready Answer

SubmitForm is best for standard form submissions with built-in validation, while Patch is preferred for flexible, partial, or logic-based updates where you need more control over what data is saved.