Retrieve values from nested named lists — getIn • fsbrain

Retrieve values from nested named lists

Usage

getIn(named_list, listkeys, default = NULL)

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.

Value

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

Examples

   data = list("regions"=list("frontal"=list("thickness"=2.3, "area"=2345)));
   getIn(data, c("regions", "frontal", "thickness"));       # 2.3
#> [1] 2.3
   getIn(data, c("regions", "frontal", "nosuchentry"));     # NULL
#> NULL
   getIn(data, c("regions", "nosuchregion", "thickness"));  # NULL
#> NULL
   getIn(data, c("regions", "nosuchregion", "thickness"), default=14);  # 14
#> [1] 14