SCAN can generate running totals, running counts, and other calculations that create intermediate or incremental results.
The results returned by SCAN are the value of an “accumulator” at each step in the process.
However, while REDUCE returns asinglevalue, SCAN returns anarrayof values.
LAMBDA structure
SCAN uses theLAMBDA functionto apply the required calculation.
Thevargument represents the value of each element in thearray.
Thecalculationis a formula that refers to both the accumulator (a) and value (v).
Note: SCAN returns the value of the accumulator when each element in the array is processed.
The result is an array of “intermediate” values.
Text values
To work with text values, set theinitial_valueto an empty string ("").
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….
