Daily DAX : Day 450 ISBOOLEAN

Power BI DAX Function: ISBOOLEAN

Description

The ISBOOLEAN function checks whether a given value is a Boolean (logical) value, meaning it is either TRUE or FALSE. It returns TRUE if the value is Boolean, and FALSE otherwise.

Note: ISBOOLEAN is an alias for ISLOGICAL and belongs to the Information functions category in DAX.

Syntax

ISBOOLEAN(<value>)

Parameters

  • value: The value or expression to check. This can be a constant, column reference, or any DAX expression.

Return Value

A Boolean value: TRUE or FALSE.

Examples

ISBOOLEAN(TRUE)   // Returns TRUE

ISBOOLEAN(FALSE)  // Returns TRUE

ISBOOLEAN(1)      // Returns FALSE (1 is treated as numeric, not Boolean in type checking)

ISBOOLEAN("True") // Returns FALSE (text string)

ISBOOLEAN(BLANK()) // Returns FALSE

Another example in a query:

IF ( ISBOOLEAN(TRUE), "It is Boolean", "Not Boolean" )
// Returns "It is Boolean"

Use Cases

ISBOOLEAN is particularly useful for:

  • Type validation: Ensuring that a parameter or column value is truly Boolean before performing logical operations, especially in complex measures or custom functions.
  • Dynamic calculations: In scenarios where expressions might return different data types (e.g., due to errors or blanks), to safely handle Boolean-specific logic.
  • Debugging and error handling: Checking input types in calculated columns or measures to prevent unexpected behavior.
  • Advanced scenarios: With user-defined functions (UDFs) or when integrating data from varied sources where type consistency needs verification.

It helps make DAX code more robust by explicitly verifying data types.


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