R: Merge two lists

merge.list

R Documentation

Merge two lists

Description

Merges two lists, taking duplicated elements from the first list.

Usage

## S3 method for class 'list'
merge(x, y, warn_on_dupes = TRUE, allow_unnamed_elements = FALSE, ...)

Arguments

`x`	A list.
`y`	A list.
`warn_on_dupes`	`TRUE` or `FALSE`. Should a warning be given if both `x` and `y` have elements with the same name. See note.
`allow_unnamed_elements`	`TRUE` or `FALSE`. Should unnamed elements be allowed?
`...`	Ignored.

Value

A list, combining elements from x and y.

Note

In the event of elements that are duplicated between x and y, the versions from x are used.

Examples

merge(
  list(foo = 1, bar = 2, baz = 3), 
  list(foo = 4, baz = 5, quux = 6)
)

# If unnamed elements are allowed, they are included at the end
merge(
  list("a", foo = 1, "b", bar = 2, baz = 3, "c"), 
  list(foo = 4, "a", baz = 5, "b", quux = 6, "d"),
  allow_unnamed_elements = TRUE
)