October 2014
Intermediate to advanced
280 pages
7h 20m
English
Content preview from Programming ElixirBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Enum—Processing Collections
The Enum module is probably the most used of all the Elixir libraries. Employ it to iterate, filter, combine, split, and otherwise manipulate collections. Here are some common tasks:
-
Convert any collection into a list:
iex> list = Enum.to_list 1..5 [1, 2, 3, 4, 5] -
Concatenate collections:
iex> Enum.concat([1,2,3], [4,5,6]) [1, 2, 3, 4, 5, 6] iex> Enum.concat [1,2,3], 'abc' [1, 2, 3, 97, 98, 99] -
Create collections whose elements are some function of the original:
iex> Enum.map(list, &(&1 * 10)) [10, 20, 30, 40, 50] iex> Enum.map(list, &String.duplicate("*", &1)) ["*", "**", "***", "****", "*****"] -
Select elements by position or criteria:
iex> Enum.at(10..20, 3) 13
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