Single-bracket assignment on a catt_df object

Intercepts column assignment by the pre-1.11.0 Title-Case names and stops with a migration message. The check fires when an old name appears in the column-selector position. Row-only assignment (df[i, ] <- v) and assignment by new column names fall through to the data.frame method via NextMethod().

Usage

# S3 method for class 'catt_df'
x[i, j, ...] <- value

Arguments

x

A catt_df object.

i, j

Row / column selectors; see [<-.data.frame.

...

Further arguments passed through.

value

The value to assign.

Value

The modified catt_df object, as for [<-.data.frame.

Details

The nargs() distinction here mirrors the read-side [.catt_df, but the threshold shifts by one because [<- carries an extra positional value argument: df[i] <- v has nargs() == 3 and i is the column selector; df[i, j] <- v and df[i, ] <- v have nargs() == 4 and j (if non-missing) is the column selector.