In this article, you will learn what the ISOMITTED formula is and how to use the same in Excel.

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What does the ISOMITTED formula do in Excel?

The "ISOMITTED" formula in Excel is used to determine if a value is missing within a LAMBDA function, and it returns either TRUE (value is missing) or FALSE (value is not missing) based on the evaluation.

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How to use the ISOMITTED function in Excel?

The syntax of the ISOMITTED formula in Excel is as follows:

=ISOMITTED(argument)

=ISOMITTED(argument)

=ISOMITTED(argument)

=ISOMITTED(argument)

Where, “argument” is the value you want to test, such as a LAMBDA argument.

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The ISOMITTED function returns a value of type Boolean (TRUE or FALSE).

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Sample Use Case for ISOMITTED formula

Create a LAMBDA function named “RectangleArea” that calculates the area of a rectangle when the dimensions of the two sides are provided as two inputs “x” & “y”. 

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Similarly, create another LAMBDA function named “Rectangle_Area”, however, this time use the ISOMITTED formula to check whether y parameter is missing as shown below. 

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If the first RectangleArea function is used with only one input argument the LAMBDA function assumes the other as 0 and returns 0 as the output of the multiplication (seen in Row 4 below)

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However, if the LAMBDA function created in conjunction with the ISOMITTED is used, the appropriate error message is provided by the function Rectangle_Area when y parameter is missing. 

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If you want to create a similar LAMBDA formula which shows a proper error message when either x or y parameter is missing, you can generate the LAMBDA formula as follows:

=LAMBDA(x,y,IF(OR(ISOMITTED(x),ISOMITTED(y)),"Missing argument",x+y))

=LAMBDA(x,y,IF(OR(ISOMITTED(x),ISOMITTED(y)),"Missing argument",x+y))

=LAMBDA(x,y,IF(OR(ISOMITTED(x),ISOMITTED(y)),"Missing argument",x+y))

=LAMBDA(x,y,IF(OR(ISOMITTED(x),ISOMITTED(y)),"Missing argument",x+y))