julia> pairs("François") |> collect                                                                        
     8-element Vector{Pair{Int64, Char}}:                                                            
     1 => 'F'                                                                                                
     2 => 'r'                                                                                                
     3 => 'a'                                                                                           
     4 => 'n'                                                                                                
     5 => 'ç'                                                                                                  
     7 => 'o'                                                                                                  
     8 => 'i'                                                                                                  
     9 => 's'

In contrast, enumerate() gets you the iteration number:

    julia> enumerate("François") |> collect                                                                    
    8-element Vector{Tuple{Int64, Char}}:                                                           
     (1, 'F')                                                                                                
     (2, 'r')                                                                                                
     (3, 'a')                                                                                           
     (4, 'n')                                                                                                
     (5, 'ç')                                                                                                  
     (6, 'o')                                                                                                  
     (7, 'i')                                                                                                  
     (8, 's')