BYCOL

BYCOL(array, lambda(column))

Returns the results from applying a LAMBDA function to each column in an array.

arrayAn array to be separated by column.
lambdaA nested LAMBDA function that takes a single parameter.
columnA column from array.

REMARKS
* Added in Microsoft 365.
* This function can create a Dynamic Array Formula.
* This function uses the LAMBDA function.
* This LAMBDA function must take a single parameter.
* This LAMBDA function must have parameter names that do not contain any numbers.
* This LAMBDA function must have a calculation formula that is compatible with arrays.
* You can use the BYROW function to return the results from applying a LAMBDA function to each row in an array.
* This function was released in July 2021.
* For the Microsoft documentation refer to support.microsoft.com

 AB
1=BYCOL(5,LAMBDA(p_one,SUM(p_one,p_one))) = 10100
2=BYCOL(10,LAMBDA(p_one,SUM(p_one,p_one))) = 20200
3=BYCOL({10;20},LAMBDA(p_one,SUM(p_one))) = 30300
4=BYCOL({10;20;30;40},LAMBDA(p_one,MAX(p_one))) = 40 
5=BYCOL(B1:B3,LAMBDA(p_one,SUM(p_one))) = 600 
6=BYCOL(B1:B3,LAMBDA(p_one,AVERAGE(p_one))) = 200 
7=BYCOL({10,20},LAMBDA(p_one,SUM(p_one))) = {10, 20} 
8=BYCOL(B1:B3,LAMBDA(p_one,2*p_one)) = #CALC! 

1 - What is the result of passing in the value "5" to the function "SUM(5,5)".
2 - What is the result of passing in the value "10" to the function "SUM(10,10)".
3 - What is the result of passing in the array values {10;20} (with semi-colons) to the function "SUM(array)".
4 - What is the result of passing in the array values {10;20;30;40} (with semi-colons) to the function "MAX(array)".
5 - What is the result of passing in the values from cell reference "B1:B3" to the functon "SUM(array)".
6 - What is the result of passing in the values from cell reference "B1:B3" to the functon "AVERAGE(array)".
7 - What is the result of passing in the array values {10,20} (with commas) to the function "SUM(array)".
8 - If the calculation formula passed to the LAMBDA function is not compatible with arrays, then #CALC! is returned.

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