FALSE
This example shows how ISOMITTED can be used to determine if an argument is missing from a function call. =LAMBDA(x,y, IF(ISOMITTED(y),"Missing second argument",x+y))(1,) returns the value of x if y is missing, and the string “Missing second argument†if y is included.
The ISOMITTED function checks if a value in a LAMBDA is missing and returns TRUE or FALSE accordingly. It is a useful tool for verifying the presence of data in a LAMBDA.