R: Embrace operator {{

embrace-operator {rlang} | R Documentation

## Embrace operator `{{`

### Description

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

- What is data-masking and why do I need {{?

- Data mask programming patterns

[Package rlang version 1.0.2 Index]