Redundant functions HASONEVALUE/SELECTEDVALUE, duplicated expression in arg. 3 of both IF functions

The expression involving HASONEVALUE and SELECTEDVALUE functions can be optimized by removing HASONEVALUE, reducing the redundant expression in the third argument of both IF functions.

Remarks

SELECTEDVALUE returns a non-blank value when there is only one value visible in the referenced column. Embedding SELECTEDVALUE in a condition related to HASONEVALUE seems redundant: removing HASONEVALUE can slightly improve the performance.

The third argument of both IF functions is duplicated, which allows to rely on the inner IF functions also for the cases covered by the outer IF function.

Example

Remove the outer IF function, the HASONEVALUE condition, and the third argument of the outer IF function, making sure that it is the same expression as the third argument of the inner IF function.

Original code

IF (
    HASONEVALUE( Customer[Country] ),
    IF (
        SELECTEDVALUE( Customer[Country] ) = "Canada",
        BLANK(),
        [Sales Amount]
    ),
    [Sales Amount]
)

Possible optimization

IF (
    SELECTEDVALUE( Customer[Country] ) = "Canada",
    BLANK(),
    [Sales Amount]
)