October 2014
Intermediate to advanced
280 pages
7h 20m
English
Content preview from Programming Elixir
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The List Module in Action
The List module provides a set of functions that operate on lists.
| | # |
| | # Concatenate lists |
| | # |
| | iex> [1,2,3] ++ [4,5,6] |
| | [1, 2, 3, 4, 5, 6] |
| | # |
| | # Flatten |
| | # |
| | iex> List.flatten([[[1], 2], [[[3]]]]) |
| | [1, 2, 3] |
| | # |
| | # Folding (like reduce, but can choose direction) |
| | # |
| | 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()))" |
| | # |
| | # Merging lists and splitting them apart |
| | # |
| | iex> l = List.zip([[1,2,3], [:a,:b,:c], ["cat", "dog"]]) |
| | [{1, :a, "cat"}, {2, :b, "dog"}] |
| | iex> List.unzip(l) |
| | [[1, 2], [:a, :b], ["cat", "dog"]] |
| | # |
| | # Accessing ... |
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.