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# Streams
## Lazy Evaluation
```elixir
stream =
1..10
|> Stream.map(fn int -> int * 2 end)
|> Stream.map(fn int -> int * 2 end)
|> Stream.map(fn int -> int * 2 end)
|> Stream.map(fn int -> int * 2 end)
```
```elixir
Enum.take(stream, 5)
```
## Generators
```elixir
Stream.iterate(0, fn
acc -> acc + 1
end)
|> Enum.take()
```
```elixir
3 ** 3
```
```elixir
Stream.unfold(1, fn acc ->
element = acc ** 2
IO.inspect(acc, label: "ACC")
IO.inspect(element, label: "EL")
{element, acc + 1}
end)
|> Enum.take(5)
# acc = 1
# 1 + 1
# 2 + 1
# 3 + 1
# 4 + 1
# 5
# 1 ** 2
# 2 ** 2
# 3 ** 2
# 4 ** 2
# 5 ** 2
```
See source 
