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Reduces an array to an accumulated value by applying a LAMBDA to each value and returning the total value in the accumulator.   


=REDUCE([initial_value], array, lambda(accumulator, value, body))

The REDUCE function syntax has the following arguments and parameters:

  • [initial_value]    Sets the starting value for the accumulator.

  • array      An array to be reduced.

  • lambda      A LAMBDA that is called to reduce the array. The LAMBDA takes three parameters:

    • accumulator    The value totaled up and returned as the final result.

    • value     The current value from the array.

    • body     The calculation applied to each element in the array.


Use the initial_value argument to set the starting value for the accumulator parameter. In Example 2, where you multiply the accumulator, set the value to 1 to avoid multiplying by 0.


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


Example 1: Sum the squared values

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

=REDUCE(, A1:C2, LAMBDA(a,b,a+b^2))

First REDUCE function example1

Example 2: Create a customized "PRODUCTIF" function to multiply only values greater than 50

Create a table named "Table3" with one column named "nums" starting at cell E1. Copy the following formula into cell G2:



Example 3: Count only even values

Create a table named "Table4" with one column named "Nums" starting at cell D1. Copy the following formula into cell F2:

=REDUCE(0,Table4[Nums],LAMBDA(a,n,IF(ISEVEN(n),1+a, a)))

Third REDUCE function example

See Also

LAMBDA function

MAP function

SCAN function

MAKEARRAY function

BYCOL function

BYROW function

ISOMITTED function

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