Information functions, part two

ISERROR

ISEMPTY

ISBLANK

Checks whether a value is blank, and returns TRUE or FALSE.

ISBLANK(<value>)

return type : Boolean

Example 1

I want to return a UNICHAR() function in case, that there is a blank value in the sale column.

Example 2

ISBLANK() vs BLANK()

BLANK() -- Returns blanks and empty string. Works with categorical and numerical data.

ISBLANK() -- Returns only blanks in the numeric data.

I want to calculate the number of missing stores in the tblStore[Store] column. These are the categorical data.

BLANK() function can works with the categorical data and returned a correct number of empty strings in the [Store] column.

ISBLANK() function does not work with empty string, returned (Blank)

ISEMPTY

Checks if a table is empty, contains any row.

return value: TRUE if the table is empty (has no rows)

ISERROR

I wrote a measure, that designedly generates an error, if used in a table or somewhere. This calculation is unprotected against any error messages.

ISERROR is able to detect if its argument produces an error...

ISERROR vs IFERROR

IFERROR evaluates an expression and returns a specified value if the expression returns an error; otherwise returns the value of the expression itself.

note:

The IFERROR function is a faster implementation of a semantically equivalent IF( ISERROR () pattern.

IF ( ISERROR ( A ), B, A ) = IFERROR ( A, B )

In this case would be more natural to use the DIVIDE function, which contains an error handling logic in form of an alternate result.

DIVIDE(<numerator>, <denominator> [,<alternateresult>])