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Add more example code to closure project

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This commit is contained in:
Timothy Warren 2019-02-01 16:07:07 -05:00
parent 4015bdac47
commit d4835dc6b8
2 changed files with 144 additions and 38 deletions
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107
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75
closures/src/lib.rs Normal file
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@ -0,0 +1,75 @@
#[derive(PartialEq, Debug)]
struct Shoe {
size: u32,
style: String,
}
fn shoes_in_my_size(shoes: Vec<Shoe>, shoe_size: u32) -> Vec<Shoe> {
shoes.into_iter() // into_iter takes ownership of the original vector
.filter(|s| s.size == shoe_size) // Filter is lazy!
.collect() // Tell the iterator to run, and give me a collection
}
struct Counter {
count: u32,
}
impl Counter {
fn new() -> Counter {
Counter { count: 0 }
}
}
impl Iterator for Counter {
type Item = u32;
fn next(&mut self) -> Option<Self::Item> {
self.count += 1;
if self.count < 6 {
Some(self.count)
} else {
None
}
}
}
#[test]
fn filters_by_size() {
let shoes = vec![
Shoe { size: 10, style: String::from("sneaker") },
Shoe { size: 13, style: String::from("sandal") },
Shoe { size: 10, style: String::from("boot") },
];
let in_my_size = shoes_in_my_size(shoes, 10);
assert_eq!(
in_my_size,
vec![
Shoe { size: 10, style: String::from("sneaker") },
Shoe { size: 10, style: String::from("boot") },
]
);
}
#[test]
fn calling_next_directly() {
let mut counter = Counter::new();
assert_eq!(counter.next(), Some(1));
assert_eq!(counter.next(), Some(2));
assert_eq!(counter.next(), Some(3));
assert_eq!(counter.next(), Some(4));
assert_eq!(counter.next(), Some(5));
assert_eq!(counter.next(), None);
}
#[test]
fn using_other_iterator_trait_methods() {
let sum: u32 = Counter::new().zip(Counter::new().skip(1))
.map(|(a, b)| a * b)
.filter(|x| x % 3 == 0)
.sum();
assert_eq!(18, sum);
}