powerquery - DAX EARLIER() function in Power Query -


is there an equivalent earlier in m/power query?

say, have table lots of different dates in column date , smaller number of letters in column letter. want maximum date each letter.

in dax, use calculate(max([date]),filter(all(table),[letter]=earlier([letter])).

how achieve same in m?

thanks

2 solutions in code below. notice each uses "previousstep" basis, these separate solutions.

let     source = excel.currentworkbook(){[name="table1"]}[content],     previousstep = table.transformcolumntypes(source,{{"date", type date}, {"letter", type text}}),      // 1. add column original table maxdate each letter     //    "earlier"  name of function parameter; have been "x" or "marcelbeug"     addedmaxdate = table.addcolumn(previousstep, "maxdate", (earlier) => list.max(table.selectrows(previousstep, each [letter] = earlier[letter])[date])),      // 2. group letter , maxdate each letter     groupedonletter = table.group(previousstep, {"letter"}, {{"maxdate", each list.max([date]), type date}}) in     groupedonletter

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