While Loop 03-05-2019 11:56 AM

[Greg_Deckler]

A way to emulate a traditional "while" loop using DAX. For a detailed explanation, see this article:

https://community.powerbi.com/t5/Community-Blog/For-and-While-Loops-in-DAX/bc-p/637511

For a practical implementation, see my "Days of Supply" Quick Measure:

https://community.powerbi.com/t5/Quick-Measures-Gallery/Days-of-Supply/m-p/635656

While Loop = 
// Provide some starting value via user input
VAR __i = 10
// Generate a "loop table", this will emulate a while loop
VAR __loopTable = GENERATESERIES(1,__i)
// Add in our calculated value, emulating calculations done as iterations over the loop
VAR __loopTable1 = ADDCOLUMNS(__loopTable,"__i",[Value] - 1)
RETURN
COUNTROWS(FILTER(__loopTable1,[__i]>1))+1

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