tibble (version 3.1.0)

lst: Build a list

Description

lst() constructs a list, similar to base::list(), but with some of the same features as tibble(). lst() builds components sequentially. When defining a component, you can refer to components created earlier in the call. lst() also generates missing names automatically.

See rlang::list2() for a simpler and faster alternative without tibble's evaluation and auto-name semantics.

Usage

lst(...)

Arguments

...

<dynamic-dots> A set of name-value pairs. These arguments are processed with rlang::quos() and support unquote via !! and unquote-splice via !!!. Use := to create columns that start with a dot.

Arguments are evaluated sequentially. You can refer to previously created elements directly or using the .data pronoun. An existing .data pronoun, provided e.g. inside dplyr::mutate(), is not available.

Value

A named list.

Examples

# NOT RUN {
# the value of n can be used immediately in the definition of x
lst(n = 5, x = runif(n))

# missing names are constructed from user's input
lst(1:3, z = letters[4:6], runif(3))

a <- 1:3
b <- letters[4:6]
lst(a, b)

# pre-formed quoted expressions can be used with lst() and then
# unquoted (with !!) or unquoted and spliced (with !!!)
n1 <- 2
n2 <- 3
n_stuff <- quote(n1 + n2)
x_stuff <- quote(seq_len(n))
lst(!!!list(n = n_stuff, x = x_stuff))
lst(n = !!n_stuff, x = !!x_stuff)
lst(n = 4, x = !!x_stuff)
lst(!!!list(n = 2, x = x_stuff))
# }