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Printing a Hash

Problem

You want to print a hash (keys and values).

Solution

Using recipe HashRecipeTraverse we can easily print all the elements in the hash:

1> MyDict = dict:from_list([{foo,1},{bar,2},{baz,3}]).
[ ... ]
2> lists:foreach(fun(X) -> {Key,Value} = X,    
2>     io:fwrite("~p: ~p~n", [Key, Value]) end,
2>     dict:to_list(MyDict)).                  
bar: 2
baz: 3
foo: 1
ok

Discussion

You can similarly use the ets:first and ets:next functions to traverse an ets table for printing.

Comments about this recipe

Contributors

Based on work by KarlaRamirez.

-- BrentAFulgham - 31 Aug 2004