Power Fx function
Errors and blanks
IsBlank
Detects an empty value.
What it does
Detects an empty value.
The job: Detect missing values and failed operations before they silently break a formula.
How to use IsBlank
Start from the task, not the alphabet. If you are shaping rows for a gallery, reach for IsBlank alongside the other data functions in its group; if you are saving, navigating, or changing state, use it on an event such as a button OnSelect rather than in a display property. When a formula misbehaves, check for a blank value where you expected text, then confirm the behaviour against the examples in the Power Fx function reference hub.
New to the language itself? Read What Is Microsoft Power Fx? first, then come back here when you need this specific tool.