y <- iris[1:3,]
x <- y
x <- head(x,2) # remove a row
x[1,1] <- 10 # change a value
x$hello <- "world" # add a column
x$Species <- NULL # remove a column
patch <- diff_data(y, x)
render_diff(patch, title="compare x and y", pretty = TRUE)
#apply patch
y_patched <- patch_data(y, patch)
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