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Scans an array by applying a LAMBDA to each value and returns an array that has each intermediate value.  


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

The SCAN function syntax has the following arguments and parameters:

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

  • array      An array to be scanned.

  • 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. If you are working with text, set the initial value to "".


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


Example 1: Create a list of factorials

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

=SCAN(1, A1:C2, LAMBDA(a,b,a*b))

First SCAN function example

Example 2: Concatenate characters in an array

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


Second SCAN function example

See Also

LAMBDA function

MAP function

REDUCE function

MAKEARRAY function

BYCOL function

BYROW function

ISOMITTED function

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