Programming Elixir 1.2

The List Module in Action

The List module provides a set of functions that operate on lists.

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# Concatenate lists
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iex> [1,2,3] ++ [4,5,6]
[1, 2, 3, 4, 5, 6]
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# Flatten
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iex> List.flatten([[[1], 2], [[[3]]]])
[1, 2, 3]
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# Folding (like reduce, but can choose direction)
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iex> List.foldl([1,2,3], "", fn value, acc -> "#{value}(#{acc})" end)
"3(2(1()))"
iex> List.foldr([1,2,3], "", fn value, acc -> "#{value}(#{acc})" end)
"1(2(3()))"
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# Updating in the middle (not a cheap operation)
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iex> list = [ 1, 2, 3 ]
[ 1, 2, 3 ]
iex> List.replace_at(list, 2, "buckle my shoe")
[1, 2, "buckle my shoe"]
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# Accessing tuples within lists
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iex> kw = [{:name, ...