The binary module in Erlang provides an easy way to split binaries using
split/2,3, but what if you want to join a list of binaries back together?
There is no built-in function to do this, so I’ve decided to write my own.
-spec binary_join([binary()], binary()) -> binary(). binary_join(, _Sep) -> <<>>; binary_join([Part], _Sep) -> Part; binary_join([Head|Tail], Sep) -> lists:foldl(fun (Value, Acc) -> <<Acc/binary, Sep/binary, Value/binary>> end, Head, Tail).
It works just like you would expect:
binary_join([<<"Hello">>, <<"World">>], <<", ">>) % => <<"Hello, World">> binary_join([<<"Hello">>], <<"...">>) % => <<"Hello">>
Hope you find this useful!