37 lines
1.2 KiB
Markdown
37 lines
1.2 KiB
Markdown
---
|
|
layout: post
|
|
title: Joining a List of Binaries in Erlang
|
|
description: "Description and implementation of a function that joins a list of binaries."
|
|
date: 2014-02-16 15:30:00 CET
|
|
category: posts
|
|
tags: [erlang, programming, english]
|
|
image:
|
|
feature: header/abstract-3.jpg
|
|
credit: dargadgetz
|
|
creditlink: http://www.dargadgetz.com/ios-7-abstract-wallpaper-pack-for-iphone-5-and-ipod-touch-retina/
|
|
comments: true
|
|
share: true
|
|
---
|
|
|
|
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.
|
|
|
|
{% highlight erlang linenos %}
|
|
-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).
|
|
{% endhighlight %}
|
|
|
|
It works just like you would expect:
|
|
|
|
{% highlight erlang %}
|
|
binary_join([<<"Hello">>, <<"World">>], <<", ">>) % => <<"Hello, World">>
|
|
binary_join([<<"Hello">>], <<"...">>) % => <<"Hello">>
|
|
{% endhighlight %}
|
|
|
|
Hope you find this useful!
|