New layer step

Builds one step of a variable's derivation pipeline: a layer name plus its named args. Nested one-element lists are flattened (JSON round-trip normalization) and empty args are dropped.

Usage

new_step(layer, args = list())

Arguments

layer

Layer name; must be one of [layer_names()].

args

Named list of layer arguments.

Value

A list of class `aa_step` with elements `layer` and `args`.

Details

Construct a layer step

Examples

new_step("assign", list(target = "TRT01P", from = "TRT01P"))
#> $layer
#> [1] "assign"
#> 
#> $args
#> $args$target
#> [1] "TRT01P"
#> 
#> $args$from
#> [1] "TRT01P"
#> 
#> 
#> attr(,"class")
#> [1] "aa_step" "list"