Array.$$()

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Array.$$(Function|Array of Functions[,param1,param2,...])

This returns the result of each row of the Array being operated on by the function or array of functions passed. The parameters provided following the function/function array is passed to the function with each row as the first parameter. Used for aggregate functions or functions that apply on each row (such as a spreadsheet calculation).

For example, a=|4,4,1..10|

1 2 3 4
5 6 7 8
9 10 1 2
3 4 5 6

a.$$(SUM)

10
26
22
18

gives row wise sums of each row.