Comprehensions
Learn about comprehension, its scope, and its returned values.
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When we’re writing functional code, we often map and filter collections of things. To make our life easier (and our code easier to read), Elixir provides a general-purpose shortcut for this: the comprehension.
The idea of comprehension is fairly simple: given one or more collections, extract all combinations of values from each, optionally filter the values, and then generate a new collection using the remaining values.
The general syntax for comprehensions is deceptively simple: result = for generator or filter... [, into: value ], do: expression.
Let’s see a couple of basic examples before we get into the details.
iex> for x <- [