Monday, April 25, 2022

MAP function [MS]

Returns an array formed by mapping each value in the array(s) to a new value by applying a LAMBDA to create a new value.


=MAP (array1, lambda_or_array<#>)

The MAP function syntax has the following arguments and parameters:

  • array1      An array to be mapped.

  • lambda_or_array<#>      A LAMBDA which must be the last argument and which must have either a parameter for each array passed, or another array to be mapped.


Providing an invalid LAMBDA function or an incorrect number of parameters returns a #VALUE! error called "Incorrect Parameters".


Example 1: Square numbers above a certain value

Enter the sample data into cells A1:C2, and then copy the formula into cell D4:

=MAP(A1:C2, LAMBDA(a, IF(a>4,a*a,+a)))

Note      Calculating the last LAMBDA parameter as +a coerces it to an integer and prevents a #CALC! error.

First MAP function example1

Example 2: Find values from two columns in one row that are both TRUE

Create a table named, "TableA" with two columns named "Col1" and "Col2" starting in cell D1. Add a column named "BothTrue" in cell G1. Copy the formula into cell G2:


Second MAP function example

Example 3: Find values from three columns in one row that meet certain criteria

Create a range of the sample data with two columns named "Size" and "Color" in cells D1:E11. Add two column headers named "Valid Size" and "Valid Color" in cells F1 and G1 respectively. Copy the formula into cell F2:


Third MAP function example3

See Also

LAMBDA function

REDUCE function

SCAN function

MAKEARRAY function

BYCOL function

BYROW function

ISOMITTED function

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