Unflatten

Reconstructs a nested structure from a flat list by using a tree previously created with build_tree(). Each LeafNode in the tree selects the corresponding element from x by index, and ListNodes restore the original nesting and names.

Usage

unflatten(node, x)

Arguments

node

(Node)
Tree describing the target structure, as returned by build_tree().

x

(list)
Flat list of leaf values, typically produced by flatten().

Value

The reconstructed nested structure (list or single value).

See also

flatten(), build_tree()

Examples

x <- list(a = 1, b = list(c = 2, d = 3))
tree <- build_tree(x)
flat <- flatten(x)

unflatten(tree, flat)
#> $a
#> [1] 1
#> 
#> $b
#> $b$c
#> [1] 2
#> 
#> $b$d
#> [1] 3
#> 
#> 

unflatten(tree, list(10, 20, 30))
#> $a
#> [1] 10
#> 
#> $b
#> $b$c
#> [1] 20
#> 
#> $b$d
#> [1] 30
#> 
#>