How to test if list element exists?

Question

Problem

I would like to test if an element of a list exists, here is an example

foo <- list(a=1)
exists(\'foo\') 
TRUE   #foo does exist
exists(\'         


        

Answer 1

A slight modified version of @salient.salamander , if one wants to check on full path, this can be used.

Element_Exists_Check = function( full_index_path ){
  tryCatch({
    len_element = length(full_index_path)
    exists_indicator = ifelse(len_element > 0, T, F)
      return(exists_indicator)
  }, error = function(e) {
    return(F)
  })
}