Convert an object to a lazy expression or lazy dots.

Convert an object to a lazy expression or lazy dots.

as.lazy(x, env = baseenv())

as.lazy_dots(x, env)

Arguments

x

An R object. Current methods for as.lazy() convert formulas, character vectors, calls and names. Methods for as.lazy_dots() convert lists and character vectors (by calling lapply() with as.lazy().)

env

Environment to use for objects that don't already have associated environment.

Examples

as.lazy(~ x + 1)
#> <lazy>
#>   expr: x + 1
#>   env:  <environment: 0x5636a4676fb8>
as.lazy(quote(x + 1), globalenv())
#> <lazy>
#>   expr: x + 1
#>   env:  <environment: R_GlobalEnv>
as.lazy("x + 1", globalenv())
#> <lazy>
#>   expr: x + 1
#>   env:  <environment: R_GlobalEnv>

as.lazy_dots(list(~x, y = ~z + 1))
#> [[1]]
#> <lazy>
#>   expr: x
#>   env:  <environment: 0x5636a4676fb8>
#> 
#> $y
#> <lazy>
#>   expr: z + 1
#>   env:  <environment: 0x5636a4676fb8>
#> 
#> attr(,"class")
#> [1] "lazy_dots"
as.lazy_dots(c("a", "b", "c"), globalenv())
#> [[1]]
#> <lazy>
#>   expr: a
#>   env:  <environment: R_GlobalEnv>
#> 
#> [[2]]
#> <lazy>
#>   expr: b
#>   env:  <environment: R_GlobalEnv>
#> 
#> [[3]]
#> <lazy>
#>   expr: c
#>   env:  <environment: R_GlobalEnv>
#> 
#> attr(,"class")
#> [1] "lazy_dots"
as.lazy_dots(~x)
#> [[1]]
#> <lazy>
#>   expr: x
#>   env:  <environment: 0x5636a4676fb8>
#> 
#> attr(,"class")
#> [1] "lazy_dots"
as.lazy_dots(quote(x), globalenv())
#> [[1]]
#> <lazy>
#>   expr: x
#>   env:  <environment: R_GlobalEnv>
#> 
#> attr(,"class")
#> [1] "lazy_dots"
as.lazy_dots(quote(f()), globalenv())
#> [[1]]
#> <lazy>
#>   expr: f()
#>   env:  <environment: R_GlobalEnv>
#> 
#> attr(,"class")
#> [1] "lazy_dots"
as.lazy_dots(lazy(x))
#> [[1]]
#> <lazy>
#>   expr: x
#>   env:  <environment: 0x5636a4676fb8>
#> 
#> attr(,"class")
#> [1] "lazy_dots"