modifyList {utils}

R Documentation

Recursively Modify Elements of a List

Description

Modifies a possibly nested list recursively by changing a subset of elements at each level to match a second list.

Usage

modifyList(x, val)

Arguments

x	a named list, possibly empty.
val	a named list with components to replace corresponding components in x.

Value

A modified version of x, with the modifications determined as follows (here, list elements are identified by their names). Elements in val which are missing from x are added to x. For elements that are common to both but are not both lists themselves, the component in x is replaced by the one in val. For common elements that are both lists, x[[name]] is replaced by modifyList(x[[name]], val[[name]]).

Author(s)

Deepayan Sarkar Deepayan.Sarkar@R-project.org

Examples

foo <- list(a = 1, b = list(c = "a", d = FALSE))
bar <- modifyList(foo, list(e = 2, b = list(d = TRUE)))
str(foo)
str(bar)

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