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add to map

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This commit is contained in:
Hatter Jiang
2020-05-03 01:00:39 +08:00
parent 0b973718b5
commit b2ac227e4c
1 changed files with 6 additions and 0 deletions
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6
single_file_tests/vec.rs
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@@ -1,3 +1,4 @@
use std::collections::BTreeMap;
fn main() { fn main() {
let v = vec![1, 3, 5]; let v = vec![1, 3, 5];
@@ -21,5 +22,10 @@ fn main() {
let v3: Vec<i32> = (0..3).collect(); let v3: Vec<i32> = (0..3).collect();
let v4 = v3.iter().map(|&x| x * 2).collect::<Vec<_>>(); let v4 = v3.iter().map(|&x| x * 2).collect::<Vec<_>>();
println!("{:?} -> {:?}", v3, v4); println!("{:?} -> {:?}", v3, v4);
println!("To Map:");
let v = (0..5).collect::<Vec<i32>>();
let m = v.iter().map(|i| (*i, i * 10)).collect::<BTreeMap<i32, i32>>();
println!("{:?}", m);
} }