34 lines
1,014 B
Markdown
34 lines
1,014 B
Markdown
---
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date: "2014-02-16T15:30:00Z"
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description: Description and implementation of a function that joins a list of binaries.
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tags:
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- erlang
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- programming
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- english
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slug: joining-a-list-of-binaries-in-erlang
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title: Joining a List of Binaries in Erlang
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---
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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?
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There is no built-in function to do this, so I've decided to write my own.
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{{< highlight erlang >}}
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-spec binary_join([binary()], binary()) -> binary().
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binary_join([], _Sep) ->
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<<>>;
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binary_join([Part], _Sep) ->
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Part;
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binary_join([Head|Tail], Sep) ->
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lists:foldl(fun (Value, Acc) -> <<Acc/binary, Sep/binary, Value/binary>> end, Head, Tail).
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{{< / highlight >}}
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It works just like you would expect:
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{{< highlight erlang >}}
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binary_join([<<"Hello">>, <<"World">>], <<", ">>) % => <<"Hello, World">>
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binary_join([<<"Hello">>], <<"...">>) % => <<"Hello">>
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{{< / highlight >}}
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Hope you find this useful!
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