Build a list
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.
lst(...)
... |
< Arguments are evaluated sequentially.
You can refer to previously created elements directly or using the .data
pronoun.
An existing |
A named list.
# 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))
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