fsbrain (version 0.5.5)

getIn: Retrieve values from nested named lists

Description

Retrieve values from nested named lists

Usage

getIn(named_list, listkeys, default = NULL)

Value

the value at the path through the lists, or `NULL` (or the 'default') if no such path exists.

Arguments

named_list

a named list

listkeys

vector of character strings, the nested names of the lists

default

the default value to return in case the requested value is `NULL`.

Examples

   data = list("regions"=list("frontal"=list("thickness"=2.3, "area"=2345)));
   getIn(data, c("regions", "frontal", "thickness"));       # 2.3
   getIn(data, c("regions", "frontal", "nosuchentry"));     # NULL
   getIn(data, c("regions", "nosuchregion", "thickness"));  # NULL
   getIn(data, c("regions", "nosuchregion", "thickness"), default=14);  # 14