Map in j does not work with .SDcols and other columns as function attributes

[ChandlerLutz]

This may be related to issue #495 #495

library(data.table)
set.seed(1234)
DT <- data.table(a = rnorm(10), b = rnorm(10), c = 10)
##Works as expected
DT[, lapply(.SD, function(x, y) x + y, y = c), .SDcols = c("a", "b")]
##Does not work as expected
DT[, Map(function(x, y) x + y, x = .SD, y = c), .SDcols = c("a", "b")]

[franknarf1]

That's just a misunderstanding of Map. Try

DT[, Map(function(x, y) x + y, x = .SD, y = .(c)), .SDcols = c("a", "b")]

[ChandlerLutz]

Oh okay, great. Thanks! Now works as expected