MAP is also useful when the formula logic is complex and would be best managed in a single location.
Using a named LAMBDA function with MAP is possible to reuse the same code elsewhere.
Note that the second argument must be an array if not a lambda.
Examples
The MAP function maps each value in an array to a custom LAMBDA function.
Without the +, MAP will return a #CALC!
This step is sometimes necessary when working with array formulas that spill.
Additional arrays
MAP can accept additional arrays that can be used by the LAMBDA during calculation.
Note: The MAP function returns an array of results.
See theREDUCE functionif you want to process each item in an array individually but you want asingleaggregated result.
LET Function
The Excel LET function lets you define named variables in a formula.
BYCOL can apply stock functions like SUM, COUNT, and AVERAGE or a custom LAMBDA function.
BYROW can apply stock functions like SUM, COUNT, and AVERAGE or a custom LAMBDA function.
All results are returned at the same time in a single array….
