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Merge pull request #638 from j3parker/patch-1

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Remove unnecessary .take(5) in iterator example
This commit is contained in:
Carol (Nichols || Goulding)
2017-05-03 19:03:47 -04:00
committed by GitHub
parent b3f938e09b 431116f5c6
commit 1ca0370103
1 changed files with 6 additions and 7 deletions
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13
second-edition/src/ch13-02-iterators.md
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@@ -217,11 +217,11 @@ method. Since `next` is the only method of the `Iterator` trait that does not
have a default implementation, once you've done that, you get all of the other
`Iterator` adaptors for free. There are a lot of them!
For example, if for some reason we wanted to take the first five values that
an instance of `Counter` produces, pair those values with values produced by
another `Counter` instance after skipping the first value that instance
produces, multiply each pair together, keep only those results that are
divisible by three, and add all the resulting values together, we could do so:
For example, if for some reason we wanted to take the values that an instance of
`Counter` produces, pair those values with values produced by another `Counter`
instance after skipping the first value that instance produces, multiply each
pair together, keep only those results that are divisible by three, and add all
the resulting values together, we could do so:
```rust
# struct Counter {
@@ -250,8 +250,7 @@ divisible by three, and add all the resulting values together, we could do so:
# }
# }
# }
let sum: u32 = Counter::new().take(5)
.zip(Counter::new().skip(1))
let sum: u32 = Counter::new().zip(Counter::new().skip(1))
.map(|(a, b)| a * b)
.filter(|x| x % 3 == 0)
.sum();