mark (version 0.8.1)

merge_list: Merge lists

Description

Merge lists with different or intersecting names

Usage

merge_list(x, y, keep = c("x", "y"), null = c("ignore", "drop", "keep")[1:2])

Arguments

x, y

Lists to merge

keep

When matching names are found, from which object should the values be retained; "x" retains values from x, "y" retains values from y.

null

Method for handling NULL values. When two values are passed, they will be applied to x and y respectively. When a single value is passed, it will be applied to both x and y.

• "ignore": NULL values are ignored. When passes to x, the NULL values will be retained if they are not overridden by y.

• "drop": NULL values are dropped from merge and will not appear in the output.

• "keep": NULL values are retained in the output and can override other values.

Examples

x <- list(a = 1, b = 2,    c = NULL, d = NULL)
y <- list(a = 2, b = NULL, c = 3)

# compared to:
utils::modifyList(x, y)
utils::modifyList(x, y, keep.null = TRUE)

merge_list(x, y)
merge_list(x, y, keep = "y")
merge_list(x, y, null = "drop")