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Guide: Iterators: …are always lazy + rewrap as per request

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Piotr Szotkowski 2014-10-28 20:23:59 +01:00
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@ -4416,11 +4416,12 @@ see why consumers matter.
## Iterators
As we've said before, an iterator is something that we can call the `.next()`
method on repeatedly, and it gives us a sequence of things. Because you need
to call the method, this means that iterators can be **lazy** and don't need to generate all of the values upfront. This code, for
example, does not actually generate the numbers `1-100`, and just creates a
value that represents the sequence:
As we've said before, an iterator is something that we can call the
`.next()` method on repeatedly, and it gives us a sequence of things.
Because you need to call the method, this means that iterators
are **lazy** and don't need to generate all of the values upfront.
This code, for example, does not actually generate the numbers
`1-100`, and just creates a value that represents the sequence:
```{rust}
let nums = range(1i, 100i);