The following code gets the number of `NA` in each of the columns as expected, but I was wondering what the `.` inside `( )` is doing.

General
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The following code gets the number of NA in each of the columns as expected, but I was wondering what the . inside ( ) is doing.

df %>% summarise(across(everything(),~sum(is.na(.))))
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You have told summarize to act on every column. The . represents the current column.

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Thank you for your help!

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