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Embrace operator {{

Source: R/nse-defuse.R
embrace-operator.Rd

The embrace operator {{ is used to create functions that call other data-masking functions. It transports a data-masked argument (an argument that can refer to columns of a data frame) from one function to another.

my_mean <- function(data, var) {
  dplyr::summarise(data, mean = mean({{ var }}))
}

Under the hood

{{ combines enquo() and !! in one step. The snippet above is equivalent to:

my_mean <- function(data, var) {
  var <- enquo(var)
  dplyr::summarise(data, mean = mean(!!var))
}

See also