Trouble with `purrr::map()` function returning unexpected results in nested lists
I've been struggling with this for a few days now and could really use some help. I'm trying to use the `purrr::map()` function to iterate over a nested list structure and update certain values, but I'm running into unexpected behavior. I have the following nested list: ```r nested_list <- list( group1 = list(a = 1, b = 2), group2 = list(a = 3, b = 4) ) ``` I want to use `map()` to increment every value in the nested lists by 1. My attempt looks like this: ```r library(purrr) updated_list <- map(nested_list, ~map(., ~ . + 1)) ``` However, instead of returning a list with incremented values, I get the following behavior: `behavior in .f(...) : argument is not numeric or logical: returning NA` I suspect this may be due to how I'm accessing the values in the inner map function. I've tried using `map_dbl()` instead of `map()`, but that also leads to the same behavior. Could someone please clarify why this is happening and how I can properly increment each value in this nested list structure? I am currently using R version 4.2.1 and `purrr` version 0.3.4. Any insights would be greatly appreciated! I'm working on a application that needs to handle this.